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?2001 microchip technology inc ds21351a TC1066 TC1066-1 12/7/99 acpi-compliant smbus thermal sensor with external diode input features specifically acpi-compliant backward compliant to older apm systems includes internal and external sensing capability outputs temperature as 8-bit digital word solid state temperature sensing; 1 c resolution 3.0 ?5.5v operating range independent internal and external threshold set-points with alert#/comp# interrupt output smbus 2-wire serial interface optional critical set-point for full acpi compliant implementation up to nine TC1066s may share the same bus standby mode for low standby power low power ........................... 70 a (max) operating ....................................... 10 a (max) standby mode 16-pin plastic qsop package typical applications thermal protection for intel ?eschutes pentium ii and other high performance cpus with integrated on-board diode ?no sensor mounting problems! accurate thermal sensing from any si junction diode thermal management in electronic systems: computers, network equipment, power supplies general description the TC1066 is a serially programmable temperature sensor optimized for monitoring modern high performance cpus with on-board integrated thermal diodes. tempera- ture data is converted from the cpu? thermal diode outputs and made available as an 8-bit digital word. communication with the TC1066 is accomplished via the standard system management bus (smbus) commonly used in modern computer systems. this permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. addition- ally, an interrupt is generated on the alert#/comp# pin when temperature moves outside the preset threshold win- dows in either direction. a separate critical setpoint is provided through external hardwiring for ?ail safe?operation per acpi guidelines. a standby command may be sent via the smbus or by signaling the stby# input pin to activate the low-power standby mode. registers can be accessed while in standby mode. address selection inputs allow up to nine TC1066s to share the same 2-wire smbus for multi-zone monitoring. all registers can be read by the host, and both polled and interrupt driven systems are easily accommodated. small size, low installed cost, and ease of use make the TC1066 an ideal choice for implementing sophisticated system man- agement schemes, such as acpi. ordering information part no. package temp. range TC1066mqr 16-pin qsop ?5 c to +125 c tcm1617ev evaluation kit block diagram evaluation kit available pin configuration register set ? modulator control logic smbus interface crit 0 crit 1 os# alert#/comp# stby# scl sda add 0 add 1 d + d ext. temp status byte config. byte conv. rate ext. hi limit ext. lo limit int. hi limit int. lo limit crit. limit int. temp internal sensor (diode) int_sel 16-pin plastic qsop 1 16 215 314 413 512 611 710 int_sel d 89 v dd crit 1 gnd gnd scl stby# nc sda alert#/comp# add0 os# d+ TC1066 crit 0 add 1 *patent pending
2 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a absolute maximum ratings* power supply voltage (v dd ) .........................................6v voltage on any pin ............ (gnd ?0.3v) to (v dd + 0.3v) operating temperature (t a ) .................. ?5 c to +125 c storage temperature (t stg ) .................. ?5 c to +150 c smbus input/output current ................. ? ma to +50 ma d?input current ...................................................... 1 ma max. power dissipation (p d ) ................................ 330 mw *static-sensitive device. unused devices must be stored in conductive material. protect devices from static discharge and static fields. stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions above 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. dc electrical characteristics: v dd = 3.3v, ?5 c t a 125 c, unless otherwise noted. symbol parameter test conditions min typ max unit power supply v dd power supply voltage ?5 t a +125 c 3.0 5.5 v v uv-lock v dd undervoltage 2.4 2.80 2.95 v lockout threshold v por power-on reset threshold v dd falling edge 1.0 1.7 2.3 v i dd operating current 0.25 conv./sec rate 70 a smbus inactive (note 1) i dd operating current 2 conv./sec rate 180 a smbus inactive (note 1) i dd-standby standby supply current v dd = 3.3v smbus active 100 a i dd-standby standby supply current v dd = 3.3v, smbus inactive 10 a i crit-bias crit[1:0] bias current power-up only 160 a i add-bias add[1:0] bias current power-up only 160 a alert#/comp# output v ol output low voltage i ol = 1.0 ma (note 3) 0.4 v os# output v ol output low voltage i ol = 1.0 ma (note 3) 0.4 v add[1:0], crit [1:0] inputs v il logic input low v dd x .3 v v ih logic input high v dd x .7 v stby# input v il logic input low v dd x .3 v v ih logic input high v dd x .7 v int_sel v il logic input low v dd x .3 v v ih logic input high v dd x .7 v r p internal pull-up resistance 500 k ? temp-to-bits converter t res basic temperature resolution 1 c t ierr internal diode temperature +60 c t a +100 c2+2 c 0 c t a +125 c3+3 c ?5 c t a 0 c 3 c t eerr external diode temperature +60 c t a +100 c3+3 c (note 4) 0 c t a +125 c5+5 c ?5 c t a 0 c 5 c
3 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a symbol parameter conditions min typ max unit i diode-high external diode (d+) ?(d? ~ 0.65v 100 a high source current i diode-low external diode (d+) ?(d? ~ 0.65v 10 a low source current v d-source d?source voltage 0.7 v t conv conversion time from chip stop to conv. msec complete (note 2) 54 83 112 ? cr conversion rate accuracy see conversion rate register desc. ?5 +35 % 2-wire smbus interface v ih logic input high 2.2 v v il logic input low .8 v v ol sda output low i ol = 2 ma (note 3) 0.4 v i ol = 4 ma (note 3) 0.6 v c in input capacitance sda, scl 5 pf i leak i/o leakage ? 0.1 1 a notes: 1. operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles. transient current may exceed this specification. 2. for true reccurring conversion time see conversion rate register description. 3. output current should be minimized for best temperature accuracy. power dissipation within the TC1066 will cause self-heating and temperature drift error. 4. refer to application note 64. smbus port ac timing: 3.3v, ?5 (t a = t j ) 125 c; c l = 80 pf, unless otherwise noted. symbol parameter test conditions min typ max unit f smb smbus clock frequency 10 100 khz t low low clock period 10% to 10% 4.7 sec t high high clock period 90% to 90% 4 sec t r smbus rise time 10% to 90% 1,000 nsec t f smbus fall time 90% to 10% 300 nsec t su(start) start condition setup time 90% scl to 10% sda 4 sec (for repeated start condition) t h(start) start condition hold time 4 sec t su-data data in setup time 1000 nsec t h-data data in hold time 1250 nsec t su(stop) stop condition setup time 4 sec t idle bus free time prior to 4.7 sec new transition electrical characteristics (cont): v dd = 3.3v, ?5 c t a 125 c,unless otherwise noted.
4 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a smbus write timing diagram smbus read timing diagram t su(start) t h(start) t su-data t h-data t su(stop) t idle a = start condition b = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls sda line low a b cdef g h i j kl m f = acknowledge bit clocked into master g = msb of data clocked into slave h = lsb of data clocked into slave i = slave pulls sda line low j = acknowledge clocked into master k = acknowledge clock pulse l = stop condition, data executed by slave m = new start condition i low i high scl sda t su(start) t h(start) t su-data t su(stop) t idle a = start condition b = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave a b cdef g h ij k e = slave pulls sda line low f = acknowledge bit clocked into master g = msb of data clocked into master h = lsb of data clocked into master i low i high i = acknowledge clock pulse j = stop condition k = new start condition scl sda
5 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a pin description pin number symbol type description 2v dd power power supply input 3 d+ bi-directional current source and a/d positive input 4 d bi-directional current sink and a/d negative input 6,10 add[1:0] input address select pins (see address decode table) 7,8 gnd power system ground 11 alert#/comp# output smbus interrupt (smbalert#) or comparator output 12 sda bi-directional smbus serial data 14 scl input smbus serial clock 15 stby# input standby enable 1,5 crit[1:0] input critical setpoint bits (see critical setpoint decode table) 9 os# output open collector, low-true ?ver-temperature?warning output 13 int_sel input selects alert# or comp# output on pin 11 16 nc not connected pin description scl input. smbus serial clock. clocks data into and out of the TC1066. see system management bus specification, rev. 1.0, for timing diagrams. sda bidirectional. serial data is transferred on the smbus in both directions using this pin. see system management bus specification, rev. 1.0, for timing diagrams. add1, add0 inputs. sets the 7-bit smbus address. these pins are ?ri-state,?and the smbus addresses are specified in the address decode table. ( note: the tri-state scheme allows up to nine TC1066s on a single bus. a match between the TC1066? address and the address specified in the serial bit stream must be made to initiate communication. many smbus-compatible devices with other addresses may share the same 2-wire bus (see system management bus specification, rev. 1.0, for ad- dress allocations). these pins are only active at power-on reset, and will latch into the appropriate states. alert#/comp#* output, open collector, active low. the alert# out- put corresponds to the general smbalert# signal and indicates an interrupt event. the TC1066 will respond to the standard smbus alert response address (see smbus specification 1.0) and associated protocol when alert# is asserted. normally, the alert# output will be asserted and latched when any of the following occurs: 1. int_temp equal to or exceeds int_hlim 2. int_temp below int_llim 3. ext_temp equal to or exceeds ext_hlim 4. ext_temp below ext_llim 5. external diode ?pen the operation of the alert# output is controlled by the mask1 bit in the config register. if the mask1 bit is set to ?,?no interrupts will be generated on alert#. the alert# output is cleared and re-armed by the alert response address (ara). this output may be wire-ored with simi- lar outputs from other smbus devices. if the alarm condition persists after the ara, the alert# output will be immedi- ately re-asserted. ( note: a pull-up resistor is necessary on alert# since it is an open-drain output. current sourced from the pull-up resistor causes power dissipation and may cause internal heating of the TC1066. to avoid affecting the accuracy of internal temperature readings, the pull-up resis- tors should be made as large as possible.) normally the comp# output will be asserted upon the following events: 1. ext_temp equal to or exceeds ext_hlim 2. external diode ?pen comp# will be de-asserted upon the following event: ext_temp below ext_llim. the operation of the comp# output is controlled by the mask1 bit in the config register. if the mask1 bit is set to ?,?no interrupts will be generated on comp#. this output may be wire-ored with similar outputs from other smbus devices. note: a pull-up resistor is necessary on comp# since it is an open-drain output. current sourced from the
6 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a pull-up resistor causes power dissipation and may cause internal heating of the TC1066. to avoid affecting the accuracy of internal temperature readings, the pull-up resis- tors should be made as large as possible. *pin 11? function is selected with pin 13 (int_sel) ?see int_sel. int_sel input. the operation of pin 11 is defined by the state of this pin. there is an internal pull-up to v dd . if int_sel is high, pin 11 will function as alert#. if int_sel is grounded, pin 11 will function as comp# . stby# input. the activation of standby mode may be achieved using either the stby# pin or the chip stop bit (config register). if stby# is pulled low, the TC1066 unconditionally enters its low-power standby mode (i dd = 10 a, max). the temperature-to-digital conversion process is halted, but alert# and os# remain functional. the TC1066? bus interface remains active, and all registers may be read from and written to normally. the int_temp and ext_temp registers will contain whatever data was valid at the time of standby. (transitions on sda or scl due to external bus activity may increase the standby power consumption.) crit [1:0] inputs. these digital pins determine the temperature threshold for the critical setpoint when the 1066 is first powered up. they must be tied either to ground or to v dd , or they must be left floating. see the critical setpoint decode table for details. os# output. open collector, low-true digital output which asserts when either int_temp or ext_temp trips the critical setpoint. this interrupt cannot be masked. d+ bi-directional. this pin connects to the anode of the external diode and is the positive a/d input. current is injected into the external diode from the TC1066, and the temperature proportional v be is measured and converted to digital temperature data. d bi-directional. this pin connects to the cathode of the external diode. current is sunk from the external diode into the TC1066 through this pin. it also is the negative input terminal to the TC1066? a/d converter. this node is kept at approximately 0.7v above ground. v dd input. power supply input. see electrical specifications. gnd input. ground return for all TC1066 functions. functional description the TC1066 acquires and converts temperature infor- mation from two separate sources, both silicon junction diodes, with a basic accuracy of 1 c. one is located on the TC1066 die; the other is connected externally. this external diode may be located on another ic die. the analog-to- digital converter on the TC1066 alternately converts tem- perature data from the two sensors and stores them sepa- rately in internal registers. the system interface is a slave smbus port with an alert# (smbalert#) and comp# interrupt outputs. the alert# interrupt is triggered when one or more of four preset temperature thresholds are tripped (see figure 1). figure 1. temperature-vs-setpoint event generation these four thresholds are user-programmable via the smbus port. the comp# interrupt is triggered when ext_temp equals or exceeds ext_hlim. also, there is a fifth indepen- dent, hardware programmable threshold (critical) that trips its own interrupt (os#) for an unconditional warning. additionally, the temperature data can be read at any time through the smbus port. nine smbus addresses are pro- grammable for the TC1066, which allows for a multi-sensor configuration. also, there is low-power standby mode where temperature acquisition is suspended. temperature setpoints time critical ext_hlim int_hlim ext_llim int_llim ext_temp int_temp assert os# release os# alert# os# assert alert# assert alert# assert alert# assert alert# note: this diagram implies that the appropriate setpoint is moved, temporarily, after each alert# event to suppress re-assertion of alert# immediately after the ara/de-assertion. comp#
7 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a figure 2. TC1066 functional description flowchart no no no yes stby mode active? yes no no por, initialize all registers no yes yes yes yes start internal conversion, status d[7] stby active? eoc? stby released? thermal trip? start external conversion stby active? hardwaretrip? no ext. diode open? no eoc? yes update ext_temp thermal trip? yes enable os# yes software trip? config [d7] active? yes yes no enable alert# no set appropriate status bit d[6:2] reset status bit d[7] yes no no execute status read and clear status execute smbus read execute smbus write status read? read/ write? alert# active? disable and re-arm alert#, send local address to host address match? yes write yes read yes yes no one shot? yes no no no no no win arbitration? ara bus arbitration yes stop conv., reset status d[7] monitor smbus for start condition no valid command? ara? yes no rest period according to conv_rate register rest period over? performance conversion cycle update int_temp one shot? no yes yes ext_hlim trip? enable comp# yes disable comp# ext_llim trip? yes no no
8 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a standby mode the TC1066 allows the host to put it into a low power mode (i dd = 10 a, max) standby mode. in this mode, the a/d converter is halted, and the temperature data registers are frozen. the smbus port operates normally. standby mode can be enabled with either the stby# input pin or the chip stop bit in the config register. the following table summarizes this operation. smbus slave address the two pins add1 and add0 are tri-state input pins which determine the 7-bit smbus slave address of the TC1066. the address is latched during por. the allowable addresses are summarized in the table below. serial port operation the serial clock input (scl) and bi-directional data port (sda) form a 2-wire bi-directional serial port for program- ming and interrogating the TC1066. the following conven- tions are used in the bus architecture in the followingtable. all transfers take place under control of a host, usually a cpu or microcontroller, acting as the master, which provides the clock signal for all transfers. the TC1066 always operates as a slave. the serial protocol is illustrated in figure 3. all data transfers have two phases; all bytes are transferred msb first. accesses are initiated by a start condition (start), followed by a device address byte and one or more data bytes. the device address byte includes a read/write selection bit. each access must be terminated TC1066 serial bus conventions term explanation transmitter the device sending data to the bus. receiver the device receiving data from the bus. master the device which controls the bus: initiating transfers (start), generating the clock, and terminating transfers (stop). slave the device addressed by the master. start a unique condition signaling the beginning of a transfer indicated by sda falling (high low) while scl is high. stop a unique condition signaling the end of a transfer indicated by sda rising (low ?high) while scl is high. ack a receiver acknowledges the receipt of each byte with this unique condition. the receiver drives sda low during scl high of the ack clock-pulse. the master provides the clock pulse for the ack cycle. busy communication is not possible because the bus is in use. not busy when the bus is idle, both sda and scl will remain high. data valid the state of sda must remain stable during the high period of scl in order for a data bit to be considered valid. sda only changes state while scl is low during normal data transfers (see start and stop conditions). start condition (start) the TC1066 continuously monitors the sda and scl lines for a start condition (a high to low transition of sda while scl is high), and will not respond until this condition is met. address byte immediately following the start condition, the host must transmit the address byte to the TC1066. the states of add1 and add0 during power-up determine the 7-bit smbus address for the TC1066. the 7-bit address transmit- ted in the serial bit stream must match for the TC1066 to respond with an acknowledge (indicating the TC1066 is on the bus and ready to accept data). the eighth bit in the address byte is a read-write bit. this bit is 1 for a read operation or 0 for a write operation. standby mode operation stby# chip stop bit one shot? operating mode 0 don? care don? care standby 1 0 don? care normal 1 1 no standby 1 1 yes normal (1 conversion only, then standby) address decode table add0 add1 smbus address 0 0 0011 000 0 open (3-state) 0011 001 0 1 0011 010 open (3-state) 0 0101 001 open (3-state) open (3-state) 0101 010 open (3-state) 1 0101 011 1 0 1001 100 1 open (3-state) 1001 101 1 1 1001 110 by a stop condition (stop). a convention called acknowl- edge (ack) confirms receipt of each byte. note that sda can change only during periods when scl is low (sda changes while scl is high are reserved for start and stop conditions.)
9 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a figure 3. smbus protocols s address wr ack command ack data ack p 8 bits 7 bits 8 bits slave address command byte: selects which register you are writing to. data byte: data goes into the register set by the command byte. write byte format read byte format s address wr ack command ack s address rd ack data nack p 7 bits 8 bits 7 bits 8 bits slave address command byte: selects which register you are reading from. slave address: repeated due to change in data- flow direction. data byte: reads from the register set by the command byte. receive byte format s address rd ack data nack p 7 bits 8 bits data byte: reads data from the register commanded by the last read byte. s = start condition p = stop condition shaded = slave transmission send byte format s address wr ack command ack p 7 bits 8 bits command byte: sends command with no data, usually used for one-shot command.
10 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a a/d conversion rate register (conv_rate) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] reserved msb x lsb acknowledge (ack) acknowledge (ack) provides a positive handshake between the host and the TC1066. the host releases sda after transmitting eight bits, then generates a ninth clock cycle to allow the TC1066 to pull the sda line low to acknowledge that it successfully received the previous eight bits of data or address. data byte after a successful ack of the address byte, the host must transmit the data byte to be written or clock out the data to be read. (see the appropriate timing diagrams.) ack will be generated after a successful write of a data byte into the TC1066. stop condition (stop) communications must be terminated by a stop condi- tion (a low to high transition of sda while scl is high). the stop condition must be communicated by the transmitter to the TC1066. (see tcn75 data sheet for serial bus timing diagrams.) command byte description command code function rit 00h read internal temp (int_temp) ret 01h read external temp (ext_temp) rs 02h read status byte (status) rc 03h read configuration byte (config) rcr 04h read conversion rate byte (conv_rate) rihl 05h read internal high limit (int_hlim) rill 06h read internal low limit (int_llim) rehl 07h read external high limit (ext_hlim) rell 08h read external low limit (ext_llim) wc 09h write configuration byte (config) wcr 0ah write conversion rate byte (conv_rate) wihl 0bh write internal high limit (int_hlim) will 0ch write internal low limit (int_llim) wehl 0dh write external high limit (ext_hlim) well 0eh write external low limit (ext_llim) osht 0fh one shot temp measurement rmid feh read manufacturer id (mfr_id) rmrev ffh read manufacturer revision number (mfr_rev) configuration register (config), 8-bits, read/write configuration register (config) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] mask1 chip stop reserved bit por state function operation d[7] 0 interrupt mask 1 = mask alert#/ (see text) comp# 0 = don? mask alert #/comp# d[6] 0 standby switch 1 = standby, 0 = normal d[5] ?d[0] 0 reserved n/a always returns zero when read. a/d conversion rate register (conv_rate), 8-bits, read/write bit por state function operation d[7:3] 0 reserved ?always n/a returns zero when read. d[2:0] 010b conversion rate bits. see below. a/d conversion rate selection d2 d1 d0 conversion rate sa/sec 0 0 0 0.0625 0 0 1 0.125 0 1 0 0.25 0110.5 1001.0 1012.0 1104.0 1118.0 note: conversion rate denotes actual sampling of both internal and external sensors. note: proper device operation is not guaranteed if undefined locations (10h to fdh) are addressed. in case of erroneous smbus operation (receive_byte command issued immediately after write_byte command) the TC1066 will acknowledge the address and return 1111 1111b to signify an error. under no condition will it implement an smbus ?imeout. register set and programmer s model TC1066 command set the TC1066 supports four smbus command protocols. these are read_byte, write_byte, send_byte, and receive_byte. see system management bus speci- fication rev. 1.0 for details.
11 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a temperature registers, 8-bits, read-only (int_temp, ext_temp) the binary value (2? complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. the registers are automatically updated in an alternating manner. internal temperature register (int_temp) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb external temperature register (ext_temp) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb temperature threshold setpoint registers, 8-bits, read-write (int_hlim, int_llim, ext_hlim, ext_llim) these registers store the values of the upper and lower temperature setpoints for event detection. the value is in 2?-complement binary. int_hlim and int_llim are com- pared with the int_temp value, and ext_hlim and ext_llim are compared with ext_temp. these registers may be written at any time. internal high limit setpoint register (int_hlim) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb internal low limit setpoint register (int_llim) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb external high limit setpoint register (ext_hlim) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb external low limit setpoint register (ext_llim) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb note: por states: int_hlim 01111111b +127 c int_llim 11001001b ?5 c ext_hlim 01111111b +127 c ext_llim 11001001b ?5 c critical setpoint register, 8-bits (reserved) this register stores the value of the critical setpoint. it is not accessible through the smbus port and only can be set with the crit[1:0] pins. the value in this register determines the os# event threshold. critical limit setpoint register (critical) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb critical setpoint decode table crit1 crit0 binary critical setpoint c 0 0 01010101 85 0 open 01011010 90 0 1 01011111 95 open 0 01100100 100 open open 01101001 105 open 1 01101110 110 1 0 01110011 115 1 open 01111000 120 1 1 01111101 125 in the two temperature data and four threshold setpoint registers, each unit value represents one degree (celsius). the value is in 2?-complement binary format such that a reading of 00000000b corresponds to 0 c. examples of this temperature-to-binary value relationship are shown in the following table. temperature-to-digital value conversion (int_temp, ext_temp, int_hlim, int_llim, ext_hlim, ext_llim) actual rounded binary hex temperature temperature value value +130.00 c +127 c 01111111 7f +127.00 c +127 c 01111111 7f +126.50 c +127 c 01111111 7f +25.25 c +25 c 00011001 19 +0.50 c+1 c 00000001 01 +0.25 c0 c 00000000 00 0.00 c0 c 00000000 00 ?.25 c0 c 00000000 00 ?.50 c0 c 00000000 00 ?.75 c1 c 11111111 ff ?.00 c1 c 11111111 ff ?5.00 c ?5 c 11100111 e7 ?5.25 c ?5 c 11100110 e7 ?4.75 c ?5 c 11001001 c9 ?5.00 c ?5 c 11001001 c9 ?5.00 c ?5 c 10111111 bf
12 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a manufacturer s identification register (mfr_id) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb status register (status), 8-bits, read only: status register (status) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] busy flag1 flag2 flag3 flag4 flag5 flag6 reserved bit(s) por function operation* state d[7] 0 signal a/d 1 = a/d busy, converter is busy. 0 = a/d idle d[6] 0 interrupt flag for 1 = interrupt occurred, int_hlim event 0 = none d[5] 0 interrupt flag for 1 = interrupt occurred, int_llim event 0 = none d[4] 0 interrupt flag for 1 = interrupt occurred, ext_hlim event 0 = none d[3] 0 interrupt flag for 1 = interrupt occurred, ext_llim event 0 = none d[2] 0 external diode 1 = external diode fault ?ault?flag 0 = external diode ok d[1:0] 0 reserved n/a always returns zero. note: all status bits are cleared after a read operation is performed on status. the ext_temp register will read +127 c if an external diode ?pen?is detected. name description por read write state int_temp internal sensor 0000 0000b* temperature (2? complement) ext_temp external sensor 0000 0000b* temperature (2? complement) status status register 0000 0000b config config register 0000 0000b conv_rate a/d conversion 0000 0010b rate register int_hlim internal high 0111 1111b limit (2? complement) int_llim internal low 1100 1001b limit (2? complement) ext_hlim external high 0111 1111b limit (2? complement) ext_llim external low 1100 1001b limit (2? complement) mfr_id ascii for letter ? 0101 0100b (microchip) mfr_rev serial device ** revision # critical critical limit n/a *** (2? complement) * note: the int_temp and ext_temp register immediately will be updated by the a/d converter after por. if stby# is low at power-up, int_temp and ext_temp will remain in por state (0000 0000b). **mfr_rev will sequence 01h, 02h, 03h, etc. by mask changes. ***critical only can be written via the crit[1:0] pins. it cannot be accessed through the smbus port. the TC1066? register set is summarized in the follow- ing table. all registers are 8-bits wide. manufacturer s identification register (mfr_id), 8-bits, read only: manufacturer s revision register (mfr_rev) d[7] d[6] d[5] d[4] d[3] d[2] d[1] d[0] msb x x x x x x lsb manufacturer s revision register (mfr_rev), 8-bits, read only: register set summary:
13 TC1066 acpi-compliant smbus thermal sensor with external diode input TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a 8 max. pin 1 .157 (3.99) .150 (3.81) .196 (4.98) .189 (4.80) .012 (0.31) .008 (0.21) .010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35) .010 (0.25) .007 (0.19) .050 (1.27) .016 (0.41) .244 (6.20) .228 (5.80) .025 (0.635) typ. 16-pin qsop (narrow) package dimensions dimensions: inches (mm) pin 1 pin 1 component taping orientation for 16-pin qsop (narrow) devices user direction of feed user direction of feed standard reel component orientation for tr suffix device reverse reel component orientation for rt suffix device w p package carrier width (w) pitch (p) part per full reel reel size 16-pin qsop (n) 12 mm 8 mm 2500 13 in carrier tape, reel size, number of components per reel and reel size taping form
14 acpi-compliant smbus thermal sensor with external diode input TC1066 TC1066-1 12/7/99 ? 2001 microchip technology inc. ds21351a information contained in this publication regarding device applications and the like is intended through suggestion only and ma y be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warrant y is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patent s or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical components in life support systems is not authori zed except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec- tual property rights. the microchip logo and name are registered trademarks of microchip technology inc. in the u.s.a. and othe r countries. all rights reserved. all other trademarks mentioned herein are the property of their respective companies. all rights reserved. ? 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