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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim's website at www.maxim-ic.com. general description the max6648/max6692 are precise, two-channel digi-tal temperature sensors. they accurately measure the temperature of their own die and a remote pn junction, and report the temperature in digital form using a 2-wire serial interface. the remote pn junction is typically the emitter-base junction of a common-collector pnp on a cpu, fpga, or asic. the 2-wire serial interface accepts standard system management bus (smbus) write byte, read byte, send byte, and receive byte commands to read the temperature data and to program the alarm thresholds. to enhance system reliability, the max6648/max6692 include an smbus timeout. a fault queue prevents the alert and overt outputs from setting until a fault has been detected one, two, or three consecutive times(programmable). the max6648/max6692 provide two system alarms: alert and overt . alert asserts when any of four tem- perature conditions are violated: local overtemperature,remote overtemperature, local undertemperature, or remote undertemperature. overt asserts when the tem- perature rises above the value in either of the two overt limit registers. the overt output can be used to activate a cooling fan, or to trigger a system shutdown. measurements can be done autonomously, with the conversion rate programmed by the user, or in a single- shot mode. the adjustable conversion rate allows the user to optimize supply current and temperature update rate to match system needs. remote accuracy is ?.8? maximum error between +25? and +125? with no calibration needed. the max6648/max6692 operate from -55? to +125?, and measure temperatures between 0? and +125?. the max6648 is available in an 8-pin ?ax package, and the max6692 is available in 8-pin ?ax and so packages. applications desktop computersnotebook computers servers thin clients workstations test and measurement multichip modules features ? dual channel measures remote and localtemperature ? +0.125? resolution ? high accuracy ?.8? (max) from +25? to +125?(remote), and ?? (max) from +60? to +100? (local) ? two alarm outputs: alert and overt ? two default overt thresholds available max6648: +110?max6692: +85? ? programmable conversion rate ? smbus-compatible interface ? smbus timeout ? programmable under/overtemperature alarmthresholds ? compatible with 90nm, 65nm, and 45nm processtechnology max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ maxim integrated products 1 ordering information v cc dxp dxn 10k each clock to fan driver or system shutdown 3.3v data interrupted to p 200 0.1 f sda sclk alert gnd 2200pf p overt max6648max6692 typical operating circuit 19-2545; rev 4; 6/08 part pin-package measured temp range max6648 mua 8 ?ax 0? to +125? max6648ymua 8 ?ax 0? to +125? max6692 mua 8 ?ax 0? to +125? max6692msa 8 so 0? to +125? MAX6692YMUA 8 ?ax 0? to +125? max6692ymsa 8 so 0? to +125? smbus is a trademark of intel corp. ?ax is a registered trademark of maxim integrated products, inc. pin configuration and functional diagram appear at end of data sheet. note: all devices operate over the -55? to +125? temperature range. downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 2 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.)v cc ...........................................................................-0.3v to +6v dxp.............................................................-0.3v to (v cc + 0.3v) dxn .......................................................................-0.3v to +0.8v sclk, sda, alert , overt .....................................-0.3v to +6v sda, alert , overt current .............................-1ma to +50ma dxn current .......................................................................?ma continuous power dissipation (t a = +70?) 8-pin ?ax (derate 5.9mw/? above +70?) .............471mw 8-pin so (derate 5.9mw/? above +70?)..................471mw esd protection (all pins, human body model) ................?000v junction temperature ......................................................+150? operating temperature range .........................-55? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v cc = 3.0v to 5.5v, t a = -55? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +85?.) (note 1) parameter symbol conditions min typ max units supply voltage v cc 3.0 5.5 v 0.125 ? temperature resolution 10 bits v cc = 3.3v, t a = +85? t rj = +25? to +125? -0.8 +0.8 t rj = +60? to +100? -1.0 +1.0 v cc = 3.3v, +60? t a +100? t rj = 0? to +125? -1.6 +1.6 remote temperature errorn = 1.008 v cc = 3.3v, +0? t a +100? t rj = 0? to +125? -3.0 +3.0 ? t a = +60? to +100? -2.0 +2.0 local temperature error v cc = 3.3v t a = 0? to +125? -3.0 +3.0 ? t a = + 60c to + 100c - 4.0 local temperature error(max6648y/max6692y) v c c = 3.3v t a = 0? to +125? -4.4 ? supply sensitivity of temperatureerror ?.2 ?/v undervoltage lockout (uvlo)threshold uvlo falling edge of v cc disables adc 2.4 2.7 2.95 v uvlo hysteresis 90 mv power-on-reset (por) threshold v cc falling edge 2.0 v por threshold hysteresis 90 mv standby supply current smbus static 3.5 12 ? operating current during conversion 0.45 0.8 ma 0.25 conversions per second 40 80 average operating current 2 conversions per second 250 400 ? conversion time t conv from stop bit to conversion completion 95 125 156 ms conversion time error -25 +25 % dxp and dxn leakage current standby mode 100 na downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3 electrical characteristics (continued)(v cc = 3.0v to 5.5v, t a = -55? to +125?, unless otherwise specified. typical values are at v cc = 3.3v and t a = +85?.) (note 1) parameter symbol conditions min typ max units high level 80 100 120 remote-diode source current i rj low level 8 10 12 ? alert , overt i sink = 1ma 0.4 output low voltage i sink = 4ma 0.6 v output high leakage current v oh = 5.5v 1 a smbus-compatible interface (sclk and sda) logic input low voltage v il 0.8 v v cc = 3.0v 2.2 logic input high voltage v ih v cc = 5.5v 2.6 v input leakage current i leak v in = gnd or v cc -1 +1 ? output low-sink current i sink v ol = 0.6v 6 ma input capacitance c in 5p f smbus-compatible timing (note 2) serial clock frequency f sclk (note 3) 100 khz bus free time between stop andstart condition t buf 4.7 ? start condition setup time 4.7 ? repeat start condition setuptime t su:sta 90% to 90% 50 ns start condition hold time t hd:sta 10% of sda to 90% of sclk 4 s stop condition setup time t su:sto 90% of sclk to 90% of sda 4 s clock low period t low 10% to 10% 4.7 ? clock high period t high 90% to 90% 4 s data setup time t hd:dat (note 4) 250 ? receive sclk/sda rise time t r 1 s receive sclk/sda fall time t f 300 ns pulse width of spike suppressed t sp 05 0 n s smbus timeout t timeout sda low period for interface reset 25 37 55 ms note 1: all parameters tested at a single temperature. specifications over temperature are guaranteed by design. note 2: timing specifications guaranteed by design. note 3: the serial interface resets when sclk is low for more than t timeout . note 4: a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of sclk? falling edge. downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 4 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ typical operating characteristics (v cc = 3.3v, t a = +25?, unless otherwise noted.) standby supply current vs. supply voltage max6648/92 toc01 supply voltage (v) standby supply current ( a) 5.0 4.5 4.0 3.5 2.8 3.2 3.6 4.02.4 3.0 5.5 operating supply current vs. conversion rate max6648/92 toc02 conversion rate (hz) operating supply current ( a) 4.00 2.00 1.00 0.50 0.25 0.13 100 200 300 400 500 600 0 0.63 remote temperature error vs. remote-diode temperature max6648/92 toc03 temperature ( c) temperature error ( c) 100 75 50 25 -1.5 -0.5 0.5 1.5 2.5 -2.5 01 2 5 t a = +85 c fairchild 2n3906 local temperature error vs. die temperature -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 max6648/92 toc05 temperature ( c) temperature error ( c) 100 75 50 25 01 2 5 remote temperature error vs. 45nm remote diode temperature max6648/92 toc04 temperature ( c) temperature error ( c) 90 80 70 60 -4 -2 0 2 4 6 -6 50 100 temperature error vs. power-supply noise frequency max6648/92 toc06 frequency (hz) temperature error ( c) 10k 1k 1 10 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0.1 100k local error remote error v in = square wave applied to v cc with no 0.1 f v cc capacitor -1 0 1 2 3 4 5 6 7 8 9 -2 temperature error vs. common-mode noise frequency max6648/92 toc07 frequency (hz) temperature error ( c) 100k 10k 10 100 1k 1 remote error local error v in = ac-coupled to dxn v in = 100mv p-p -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 -2.0 temperature error vs. differential-mode noise frequency max6648/92 toc08 frequency (hz) temperature error ( c) 100k 10k 10 100 1k 1 v in = 20mv p-p square wave applied to dxp-dxn temperature error vs. dxp-dxn capacitance max6648/92 toc09 dxp-dxn capacitance (nf) temperature error ( c) 10.000 1.000 -5 -4 -3 -2 -1 0 1 -6 0.100 100.000 downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5 detailed description the max6648/max6692 are temperature sensorsdesigned to work in conjunction with a microprocessor or other intelligence in thermostatic, process-control, or monitoring applications. communication with the max6648/max6692 occurs through the smbus-com- patible serial interface and dedicated alert pins. alert asserts if the measured local or remote temperature isgreater than the software-programmed alert high limit or less than the alert low limit. alert also asserts if the remote-sensing diode pins are shorted orunconnected. the overtemperature alarm, overt , asserts if the software-programmed overt limit is exceeded. overt can be connected to fans, a system shutdown, a clock throttle control, or other thermal-management circuitry. the max6648/max6692 convert temperatures to digital data either at a programmed rate or in single conver- sions. temperature data is represented as 10 bits plus sign, with the lsb equal to 0.125?. the ?ain?tempera- ture data registers (at addresses 00h and 01h) are 8-bit registers that represent the data as 7 bits with the final msb indicating the diode fault status (table 1). the remaining 3 bits of temperature data are available in the ?xtended?registers at addresses 11h and 10h (table 2). adc and multiplexer the averaging adc integrates over a 60ms period(each channel, typically), with excellent noise rejection. the multiplexer automatically steers bias currents through the remote and local diodes. the adc and associated circuitry measure each diode? forward volt- age and compute the temperature based on this volt- age. both channels are automatically converted once the conversion process has started, either in free-run- ning or single-shot mode. if one of the two channels is not used, the device still performs both measurements, and the user can ignore the results of the unused chan- pin description pin name function 1v cc supply voltage input, 3v to 5.5v. bypass v cc to gnd with a 0.1? capacitor. a 200 series resistor is recommended but not required for additional noise filtering. 2 dxp combined remote-diode current source and a/d positive input for remote-diode channel. do not leave dxp disconnected ; connect dxp to dxn if no remote diode is used. place a 2200pf capacitor between dxp and dxn for noise filtering. 3d x n combined remote-diode current sink and a/d negative input. dxn is internally biased to onediode drop above ground. 4 overt overtemperature alert/interrupt output, open drain. overt is logic low when the temperature is above the software-programmed threshold. 5 gnd ground 6 alert smbus alert (interrupt) output, open drain. alert asserts when temperature exceeds user-set limits (high or low temperature). alert stays asserted until acknowledged by either reading the status register or by successfully responding to an alert response address, provided that the faultcondition no longer exists. see the alert interrupts section. 7 sda smbus serial-data input/output, open drain 8 sclk smbus serial-clock input temp ( c) digital output 130 0 111 1111 127 0 111 1111 126 0 111 1111 25 0 001 1001 0 0 000 0000 <0 0 000 0000 -1 0 000 0000 -25 0 000 0000 diode fault (short or open) 1 000 0000 table 1. main temperature data registerformat (00h, 01h) downloaded from: http:///
max6648/max6692 nel. if the remote-diode channel is unused, connectdxp to dxn rather than leaving the pins open. the dxn input is biased to one v be above ground by an internal diode to prepare the adc inputs for a differ-ential measurement. the worst-case dxp-dxn differen- tial input voltage range is 0.25v to 0.95v. excess resistance in series with the remote diode causes +0.5? (typ) error per ohm. a/d conversion sequence a conversion sequence consists of a local temperaturemeasurement and a remote temperature measurement. each time a conversion begins, whether initiated auto- matically in the free-running autonomous mode ( run = 0) or by writing a one-shot command, both channels areconverted, and the results of both measurements are available after the end of a conversion. a busy status bit in the status byte indicates that the device is performing a new conversion. the results of the previous conversion are always available, even if the adc is busy. low-power standby mode standby mode reduces the supply current to less than10? by disabling the adc and timing circuitry. enter standby mode by setting the run bit to 1 in the configu- ration byte register (table 6). all data is retained in mem-ory, and the smbus interface is active and listening for smbus commands. standby mode is not a shutdown mode. with activity on the smbus, the device draws more supply current (see typical operating characteristics ). in standby mode, the max6648/max6692 can be forced toperform a/d conversions through the one-shot command, regardless of the run bit status. if a standby command is received while a conversion isin progress, the conversion cycle is truncated, and the data from that conversion is not latched into a tempera- ture register. the previous data is not changed and remains available. supply-current drain during the 125ms conversion peri- od is 500? (typ). slowing down the conversion rate reduces the average supply current (see typical operating characteristics ). between conversions, the conversion rate timer consumes about 25? of supplycurrent. in standby mode, supply current drops to about 3?. smbus digital interface from a software perspective, the max6648/max6692appear as a set of byte-wide registers that contain tem- perature data, alarm threshold values, and control bits. a standard smbus-compatible 2-wire serial interface is used to read temperature data and write control bits and alarm threshold data. these devices respond to the same smbus slave address for access to all functions. the max6648/max6692 employ four standard smbusprotocols: write byte, read byte, send byte, and receive byte (figures 1, 2, and 3). the shorter receive byte proto- col allows quicker transfers, provided that the correct data register was previously selected by a read byte instruction. use caution when using the shorter protocols in multimaster systems, as a second master could over- write the command byte without informing the first master. temperature data can be read from the read internal temperature (00h) and read external temperature (01h) registers. the temperature data format for these regis- ters is 7 bits plus 1 bit, indicating the diode fault status for each channel, with the lsb representing 1? (table 1). the msb is transmitted first. an additional 3 bits can be read from the read external extended temperature register (10h), which extends the data to 10 bits plus sign and the resolution to 0.125? per lsb (table 2). an additional 3 bits can be read from the read internal extended temperature register (11h), which extends the data to 10 bits (plus 1 bit indi- cating the diode fault status) and the resolution to 0.125? per lsb (table 2). when a conversion is complete, the main temperature register and the extended temperature register are updated simultaneously. ensure that no conversions are completed between reading the main register and the extended register, so that both registers contain the result of the same conversion. to ensure valid extended data, read extended resolu- tion temperature data using one of the following approaches: 1) put the max6648/max6692 into standby mode by setting bit 6 of the configuration register to 1. initiatea one-shot conversion using command byte 0fh. when this conversion is complete, read the contents of the temperature data registers. precision smbus-compatible remote/local temperature sensors with overtemperature alarms 6 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ fractional temp (?) digital output 0.000 000x xxxx 0.125 001x xxxx 0.250 010x xxxx 0.375 011x xxxx 0.500 100x xxxx 0.625 101x xxxx 0.750 110x xxxx 0.875 111x xxxx table 2. extended resolution temperatureregister data format (10h, 11h) downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 7 2) if the max6648/max6692 are in run mode, read the status byte. if the busy bit indicates that a conversionis in progress, wait until the conversion is complete (busy bit set to zero) before reading the temperature data. following a conversion completion, immediately read the contents of the temperature data registers. ifno conversion is in progress, the data can be read within a few microseconds, which is a sufficiently short period of time to ensure that a new conversion cannot be completed until after the data has been read. smbclk ab cd e fg h i j k smbdata t su:sta t hd:sta t low t high t su:dat t hd:dat t su:sto t buf a = start conditionb = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls smbdata line low l m f = acknowledge bit clocked into masterg = msb of data clocked into master h = lsb of data clocked into master i = master pulls data line low j = acknowledge clocked into slavek = acknowledge clock pulse l = stop condition m = new start condition figure 2. smbus write timing diagram write byte format read byte format send byte format receive byte format slave address: equiva-lent to chip-select line of a 3-wire interface command byte: selects whichregister you are writing to data byte: data goes into the registerset by the command byte (to set thresholds, configuration masks, and sampling rate) slave address: equiva-lent to chip-select line command byte: selectswhich register you are reading from slave address: repeateddue to change in data- flow direction data byte: reads fromthe register set by the command byte command byte: sends com-mand with no data, usually used for one-shot command data byte: reads data fromthe register commanded by the last read byte or write byte transmission; also used for smbus alert response return address s = start condition shaded = slave transmission p = stop condition /// = not acknowledged figure 1. smbus protocols s address rd ack data /// p 7 bits 8 bits wr s ack command ack p 8 bits address 7 bits p 1 ack data 8 bits ack command 8 bits ack wr address 7 bits s s address wr ack command ack s address 7 bits 8 bits 7 bits rd ack data 8 bits /// p downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 8 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ smbclk a = start conditionb = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave ab cd e fg hi j smbdata t su:sta t hd:sta t low t high t su:dat t su:sto t buf lm k e = slave pulls smbdata line lowf = acknowledge bit clocked into master g = msb of data clocked into slave h = lsb of data clocked into slave i = master pulls data line lowj = acknowledge clocked into slave k = acknowledge clock pulse l = stop condition m = new start condition figure 3. smbus read timing diagram alarm threshold registers four registers store alert threshold values?ne high- temperature (t high ) and one low-temperature (t low ) register each for the local and remote channels. ifeither measured temperature equals or exceeds the corresponding alert threshold value, the alert inter- rupt asserts.the power-on-reset (por) state of both alert t high registers is full scale (0101 0101, or +85?). the porstate of both t low registers is 0000 0000, or 0?. two additional registers store remote and local alarmthreshold data corresponding to the overt output. the values stored in these registers are high-temperaturethresholds. if either of the measured temperatures equals or exceeds the corresponding alarm threshold value, an overt output asserts. the por state of the overt threshold is 0110 1110 or +110? for the max6648, and 0101 0101 or +85? for the max6692. diode fault alarm a continuity fault detector at dxp detects an open cir-cuit between dxp and dxn, or a dxp short to v cc , gnd, or dxn. if an open or short circuit exists, theexternal temperature register is loaded with 1000 0000. if the fault is an open-circuit fault bit 2 (open) of the status byte, it is set to 1 and the alert condition is activated at the end of the conversion. immediatelyafter por, the status register indicates that no fault is present. if a fault is present upon power-up, the fault is not indicated until the end of the first conversion. alert interrupts the alert interrupt occurs when the internal or exter- nal temperature reading exceeds a high- or low-tem-perature limit (user programmed) or when the remote diode is disconnected (for continuity fault detection). the alert interrupt output signal is latched and can be cleared only by either reading the status register orby successfully responding to an alert response address. in both cases, the alert is cleared only if the fault condition no longer exists. asserting alert does not halt automatic conversion. the alert output pin is open drain, allowing multiple devices to share a com-mon interrupt line. the max6648/max6692 respond to the smbus alert response address, an interrupt pointer return-address feature (see the alert response address section). prior to taking corrective action, always check to ensure thatan interrupt is valid by reading the current temperature. fault queue register in some systems, it may be desirable to ignore a singletemperature measurement that falls outside the alert limits. bits 2 and 3 of the fault queue register (address22h) determine the number of consecutive temperature faults necessary to set alert (see tables 3 and 4). alert response address the smbus alert response interrupt pointer providesquick fault identification for simple slave devices that lack the complex, expensive logic needed to be a bus master. upon receiving an alert interrupt signal, the host master can broadcast a receive byte transmissionto the alert response slave address (0001 100). following such a broadcast, any slave device that gen- erated an interrupt attempts to identify itself by putting its own address on the bus. the alert response can activate several different slave devices simultaneously, similar to the i 2 c general call. if more than one slave attempts to respond, bus arbitration rules apply, and the device with the lower address code wins. the losing device does not generate an downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 9 acknowledge and continues to hold the alert line low until cleared. (the conditions for clearing an alert vary, depending on the type of slave device).successful completion of the read alert response proto- col clears the interrupt latch, provided the condition that caused the alert no longer exists. overt overtemperature alarm/warning outputs overt asserts when the temperature rises to a value stored in one of the overt limit registers (19h, 20h). it deasserts when the temperature drops below thestored limit, minus hysteresis. overt can be used to activate a cooling fan, send a warning, invoke clockthrottling, or trigger a system shutdown to prevent com- ponent damage. command byte functions the 8-bit command byte register (table 5) is the masterindex that points to the various other registers within the max6648/max6692. the register? por state is 0000 0000, so a receive byte transmission (a protocol that lacks the command byte) that occurs immediately after por, returns the current local temperature data. the max6648/max6692 incorporate collision avoid- ance so that completely asynchronous operation is allowed between smbus operations and temperature conversions. one-shot the one-shot command immediately forces a new con-version cycle to begin. if the one-shot command is received while the max6648/max6692 are in standby mode ( run bit = 1), a new conversion begins, after which the device returns to standby mode. if a one-shot conversion is in progress when a one-shot command isreceived, the command is ignored. if a one-shot com- mand is received in autonomous mode ( run bit = 0) between conversions, a new conversion begins, theconversion rate timer is reset, and the next automatic conversion takes place after a full delay elapses. configuration byte functions the configuration byte register (table 6) is a read-writeregister with several functions. bit 7 is used to mask (dis- able) interrupts. bit 6 puts the max6648/max6692 into standby mode (stop) or autonomous (run) mode. status byte functions the status byte register (table 7) indicates which (ifany) temperature thresholds have been exceeded. this byte also indicates whether the adc is converting and whether there is an open-circuit fault detected in the external sense junction. after por, the normal state of all flag bits is zero, assuming no alarm conditions are present. the status byte is cleared by any successful read of the status byte, after a conversion is complete and the fault no longer exists. note that the alert interrupt latch is not automatically cleared when thestatus flag bit indicating the alert is cleared. the fault condition must be eliminated before the alert output can be cleared.when autoconverting, if the t high and t low limits are close together, it is possible for both high-temp andlow-temp status bits to be set, depending on the amount of time between status read operations (espe- cially when converting at the fastest rate). in these cir- cumstances, it is best not to rely on the status bits to indicate reversals in long-term temperature changes. instead use a current temperature reading to establish the trend direction. conversion rate byte the conversion rate register (table 8) programs thetime interval between conversions in free-running autonomous mode ( run = 0). this variable rate control can be used to reduce the supply current in portable-equipment applications. the conversion rate byte? por state is 07h or 4hz. the max6648/max6692 look bit name por state function 7 rfu 1 reserved. always write 1 tothis bit. 6 to 3 rfu 0 reserved. always writezero to this bit. 2 fq1 0 fault queue-length controlbit (see table 4). 1 fq0 0 fault queue-length controlbit (see table 4). 0 rfu 0 reserved. always writezero to this bit. table 3. fault queue register bit definition(22h) fq1 fq0 fault queue length (samples) 00 1 01 2 11 3 10 table 4. fault queue length bit definition downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 10 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ only at the 3 lsbs of this register, so the upper 5 bitsare don? care bits, which should be set to zero. the conversion rate tolerance is ?5% at any rate setting. valid a/d conversion results for both channels are avail- able one total conversion time (125ms nominal, 156ms maximum) after initiating a conversion, whether conver- sion is initiated through the run bit, one-shot com- mand, or initial power-up. changing the conversion ratecan also affect the delay until new results are available. slave addresses the max6648/max6692 have a fixed address of 1001100. the max6648/max6692 also respond to the smbus alert response slave address (see the alert response address section). por and uvlo to prevent ambiguous power-supply conditions fromcorrupting the data in memory and causing erratic behavior, a por voltage detector monitors v cc and register address por state function rlts 00h 0000 0000 0? read local (internal) temperature rrte 01h 0000 0000 0? read remote (external) temperature rsl 02h n/a read status byte rcl 03h 0000 0000 read configuration byte rcra 04h 0000 0111 read conversion rate byte rlhn 05h 0101 0101 +85? read local (internal) alert high limit rlli 06h 0000 0000 0? read local (internal) alert low limit rrhi 07h 0101 0101 +85? read remote (external) alert high limit rrls 08h 0000 0000 0? read remote (external) alert low limit wca 09h n/a write configuration byte wcrw 0ah n/a write conversion rate byte wlho 0bh n/a write local (internal) alert high limit wllm 0ch n/a write local (internal) alert low limit wrha 0dh n/a write remote (external) alert high limit wrln 0eh n/a write remote (external) alert low limit osht 0fh n/a one-shot reet 10h 0000 0000 0? read remote (external) extended temperature riet 11h 0000 0000 0? read local (internal) extended temperature 0110 1110 +110? read/write remote (external) overt limit (max6648) rwoe 19h 0101 0101 +85? read/write remote (external) overt limit (max6692) rwoi 20h 0101 0101 +85? read/write local (internal) overt limit hys 21h 0000 1010 10? overtemperature hysteresis queue 22h 1000 0000 fault queue feh 0100 1101 read manufacture id ffh 0101 1001 read revision id table 5. command-byte bit assignments bit name por state function 7 (msb) mask 0 masks alert interrupts when set to 1. 6 run 0 standby mode control bit; if set to 1, standby mode is initiated. 5 to 0 rfu 0 reserved. table 6. configuration-byte bit assignments (03h) downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 11 clears the memory if v cc falls below 2.0v (typ). when power is first applied and v cc rises above 2.0v (typ), the logic blocks begin operating, although reads andwrites at v cc levels below 3v are not recommended. a second v cc comparator, the adc uvlo comparator prevents the adc from converting until there is suffi-cient headroom (v cc = 2.8v typ). power-up defaults power-up defaults include: interrupt latch is cleared. adc begins autoconverting at a 4hz rate. command byte is set to 00h to facilitate quick local temperature receive byte queries. local (internal) t high limit set to +85?. local (internal) t low limit set to 0?. remote (external) t high limit set to +85?. remote (external) t low limit set to 0?. overt internal limit is set to +85?; every external limit is set to +110? (max6648). overt limits are set to +85? (max6692). applications information remote-diode selection the max6648/max6692 can directly measure the dietemperature of cpus and other ics that have on-board temperature-sensing diodes (see typical operating circuit ), or they can measure the temperature of a dis- crete diode-connected transistor. effect of ideality factor the accuracy of the remote temperature measurementsdepends on the ideality factor (n) of the remote ?iode bit name por state function 7 (msb) busy 0 a/d is busy converting when 1. 6 lhigh 0 local (internal) high-temperature alarm has tripped when 1; cleared by por or readout of thestatus byte if the fault condition no longer exists. 5 llow 0 local (internal) low-temperature alarm has tripped when 1; cleared by por or readout of thestatus byte if the fault condition no longer exists. 4 rhigh 0 remote (external) high-temperature alarm has tripped when 1; cleared by por or readout of thestatus byte if the fault condition no longer exists. 3 rlow 0 remote (external) low-temperature alarm has tripped when 1; cleared by por or readout of thestatus byte if the fault condition no longer exists. 2 fault 0 a 1 indicates dxn and dxp are either shorted or open; cleared by por or readout of the statusbyte if the fault condition no longer exists. 1 eot 0 a 1 indicates the remote (external) junction temperature exceeds the external overt threshold. 0 iot 0 a 1 indicates the local (internal) junction temperature exceeds the internal overt threshold. table 7. status register bit assignments (02h) data conversion rate (hz) 00h 0.0625 01h 0.125 02h 0.25 03h 0.5 04h 1 05h 2 06h 4 07h 4 08h-ffh reserved table 8. conversion-rate control byte(04h) downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 12 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (actually a transistor). the max6648/max6692 (not themax6648y/max6692y) are optimized for n = 1.008, which is the typical value for the intel pentium iii and the amd athlon mp model 6. if a sense transistor with adifferent ideality factor is used, the output data is differ- ent. fortunately, the difference is predictable. assume a remote-diode sensor designed for a nominal ideality factor n nominal is used to measure the tem- perature of a diode with a different ideality factor n 1 . the measured temperature t m can be corrected using: where temperature is measured in kelvin.as mentioned above, the nominal ideality factor of the max6648/max6692 is 1.008. as an example, assume you want to use the max6648/max6692 with a cpu that has an ideality factor of 1.002. if the diode has no series resistance, the measured data is related to the real temperature as follows: for a real temperature of +85? (358.15 k), the mea- sured temperature is +82.91? (356.02 k), which is an error of -2.13?. effect of series resistance series resistance in a sense diode contributes addition-al errors. for nominal diode currents of 10? and 100?, change in the measured voltage is: since 1? corresponds to 198.6?, series resistance contributes a temperature offset of: assume that the diode being measured has a series resistance of 3 . the series resistance contributes an offset of:the effects of the ideality factor and series resistance are additive. if the diode has an ideality factor of 1.002 and series resistance of 3 , the total offset can be cal- culated by adding error due to series resistance witherror due to ideality factor: 1.36? - 2.13? = -0.77? for a diode temperature of +85?.in this example, the effect of the series resistance and the ideality factor partially cancel each other. for best accuracy, the discrete transistor should be a small-signal device with its collector and base connect- ed together. table 9 lists examples of discrete transis- tors that are appropriate for use with the max6648/ max6692. the transistor must be a small-signal type with a rela- tively high forward voltage; otherwise, the a/d input voltage range can be violated. the forward voltage at the highest expected temperature must be greater than 0.25v at 10?, and at the lowest expected tempera- ture, the forward voltage must be less than 0.95v at 100?. large power transistors must not be used. also, ensure that the base resistance is less than 100 . tight specifications for forward current gain (50 < <150, for example) indicate that the manufacturer has good process controls and that the devices have con- sistent v be characteristics. operation with 45nm substrate pnps small transistor geometries and specialized processescan affect temperature measurement accuracy. parasitic series resistance can be higher, which increases the measured temperature value. beta may 3 0 453 1 36 = .. c c 90 198 6 0 453 = v v c c . . vr a a ar ms s = = () 100 10 90 tt n n tt actual m nominal mm = ? ? ? ? ? ? = ? ? ? ? ? ? = .. (. ) 1 1 008 1 002 1 00599 tt n n m actual nominal = ? ? ? ? ? ? 1 intel and pentium are registered trademarks of intel corp. manufacturer model no. central semiconductor (usa) cmpt3904 rohm semiconductor (usa) sst3904 samsung (korea) kst3904-tf siemens (germany) smbt3904 table 9. remote-sensor transistormanufacturers note: transistors must be diode connected (base shorted to collector). downloaded from: http:///
max6648/max6692 be low enough to alter the effective ideality factor.good results can be obtained if the process is consis- tent and well behaved. for example, the curve shown in the remote temperature error vs. 45nm remote diode temperature graph in the typical operating characteristics section shows the temperature mea- surement error of the max6648/max6692 when usedwith a typical 45nm cpu thermal diode. note that the error is effectively a simple +4? offset. adc noise filtering the integrating adc used has good noise rejection forlow-frequency signals such as 60hz/120hz power-sup- ply hum. in noisy environments, high-frequency noise reduction is needed for high-accuracy remote mea- surements. the noise can be reduced with careful pcb layout and proper external noise filtering. high-frequency emi is best filtered at dxp and dxn with an external 2200pf capacitor. larger capacitor values can be used for added filtering, but do not exceed 3300pf because larger values can introduce errors due to the rise time of the switched current source. pcb layout follow these guidelines to reduce the measurementerror of the temperature sensors: 1) place the max6648/max6692 as close as is practi- cal to the remote diode. in noisy environments, suchas a computer motherboard, this distance can be 4in to 8in (typ). this length can be increased if the worst noise sources are avoided. noise sources include crts, clock generators, memory buses, and isa/pci buses. 2) do not route the dxp-dxn lines next to the deflec- tion coils of a crt. also, do not route the tracesacross fast digital signals, which can easily intro- duce 30? error, even with good filtering. 3) route the dxp and dxn traces in parallel and in close proximity to each other, away from any highervoltage traces, such as 12v dc. leakage currents from pcb contamination must be dealt with carefully since a 20m leakage path from dxp to ground causes about 1? error. if high-voltage traces areunavoidable, connect guard traces to gnd on either side of the dxp-dxn traces (figure 4). 4) route through as few vias and crossunders as pos- sible to minimize copper/solder thermocoupleeffects. 5) when introducing a thermocouple, make sure that both the dxp and the dxn paths have matchingthermocouples. a copper-solder thermocouple exhibits 3?/?, and takes about 200? of voltageerror at dxp-dxn to cause a 1? measurement error. adding a few thermocouples causes a negligi- ble error. 6) use wide traces. narrow traces are more inductive and tend to pick up radiated noise. the 10mil widthsand spacing recommended in figure 4 are not absolutely necessary, as they offer only a minor improvement in leakage and noise over narrow traces. use wider traces when practical. 7) add a 200 resistor in series with v cc for best noise filtering (see typical operating circuit ). 8) copper cannot be used as an emi shield; only fer- rous materials such as steel work well. placing acopper ground plane between the dxp-dxn traces and traces carrying high-frequency noise signals does not help reduce emi. twisted-pair and shielded cables use a twisted-pair cable to connect the remote sensorfor remote-sensor distance longer than 8in, or in very noisy environments. twisted-pair cable lengths can be between 6ft and 12ft before noise introduces excessive errors. for longer distances, the best solution is a shielded twisted pair like that used for audio micro- phones. for example, belden 8451 works well for dis- tances up to 100ft in a noisy environment. at the device, connect the twisted pair to dxp and dxn and the shield to gnd. leave the shield unconnected at the remote sensor. for very long cable runs, the cable? parasitic capaci- tance often provides noise filtering, so the 2200pf capacitor can often be removed or reduced in value. cable resistance also affects remote-sensor accuracy. for every 1 of series resistance, the error is approxi- mately 0.5?. precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 13 minimum 10mils10mils 10mils 10mils gnd dxn dxp gnd figure 4. recommended dxp-dxn pc traces downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms 14 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ thermal mass and self-heating when sensing local temperature, these devices areintended to measure the temperature of the pcb to which they are soldered. the leads provide a good ther- mal path between the pcb traces and the die. thermal conductivity between the die and the ambient air is poor by comparison, making air temperature measurements impractical. because the thermal mass of the pcb is far greater than that of the max6648/max6692, the devices follow temperature changes on the pcb with little or no perceivable delay. when measuring the temperature of a cpu or other ic with an on-chip sense junction, thermal mass has virtu- ally no effect; the measured temperature of the junction tracks the actual temperature within a conversion cycle. when measuring temperature with discrete remote sen- sors, smaller packages, such as sot23s, yield the best thermal response times. take care to account for ther- mal gradients between the heat source and the sensor, and ensure that stray air currents across the sensorpackage do not interfere with measurement accuracy. self-heating does not significantly affect measurement accuracy. remote-sensor self-heating due to the diode current source is negligible. for the local diode, the worst-case error occurs when autoconverting at the fastest rate and simultaneously sinking maximum current at the alert output. for example, with v cc = 5.0v, at a 4hz conversion rate and with alert sinking 1ma, the typical power dissipation is: 5.0v x 500? + 0.4v x 1ma = 2.9mw j-a for the 8-pin ?ax package is about +221?/w, so assuming no copper pcb heat sinking, the resultingtemperature rise is: t = 2.9mw x (+221?/w) = +0.6409? even under nearly worst-case conditions, it is difficult tointroduce a significant self-heating error. mux remote local adc 2 control logic smbus read write 8 8 addressdecoder 7 s r q diode fault dxp dxn smbclk smbdata register bank command byte remote temperature local temperature alert threshold alert response address v cc s r q overt alert max6648max6692 overt threshold functional diagram downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 15 12 34 8 7 6 5 sclk sda alertgnd overt dxn *so package available for max6692 only. dxp v cc max6648max6692 max/so* top view pin configuration chip information process: bicmos package information for the latest package outline information and land patterns, goto www.maxim-ic.com/packages . package type package code document no. 8 ?ax u8-1 21-0036 8 so s8-4 21-0041 downloaded from: http:///
max6648/max6692 precision smbus-compatible remote/local temperature sensors with overtemperature alarms maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 1 2 11/05 3 12/07 changed max smbus timeout from 45 to 55; and various style edits. 3, 8, 13, 14 4 6/08 updated to include 4nm cpu compatibility. 1, 5, 12, 15 downloaded from: http:///

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