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silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 1 ps/2 scrolling mouse controlier description the sc84510 scrolling mouse controller is specially designed to control ps/2 mouse device. this single chip can interface three key- switches four photo-couples plus x-axis direct to 8042 controller. sc84510 can receive command and echo status or data format which are compatible with ibm ps/2 mode mouse. key debouncing circuit is provided to prevent false entry and improve the accuracy. in the traditional mouse, a great number of noises are generated when the grid is partially closed or opened. these noises are usually mistaken for movement signals by traditional mouse controller and the cursor of the display screen is thus moved frequently up and down or back and forth. this will consume a great amount of energy. the sc84510 mouse controller provides noise immunity circuits to eliminate these noises in order to reduce energy consumption. features * using 50k 5% resistor for rc oscillation. * compatible with legacy ps/2 mouse. * compatible with microsoft scrolling mouse. * built-in noise immunity circuit. * built-in current comparator for photo-couples input. * built-in three steps dynamic input impedance. * three key-switches and four photo-couples inputs. * both key-press and key-release debounce interval 12 ms. * the sampling rate of motion detector is about 65khz. dip-16 * low power dissipation. * six types z direction input: 1. photo couples input. (z/1) 2. key-switches input. 3. voltage-sensing input. 4. mechanical input. (z/1) 5. photo couples input. (z/4) 6. mechanical input. (z/2) ordering information SC84510AP dip-16 package, photo couples input. (z/1) sc84510bp dip-16 package, key-switches input. sc84510cp dip-16 package, voltage-sensing input. sc84510dp dip-16 package, mechanical input. (z/1) sc84510ep dip-16 package, photo couples input. (z/4) sc84510fp dip-16 package, mechanical input. (z/2)
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 2 pin configurations sc84510a/b/c/e/f vdd osc out z1 z2 clk data opt vss oscr y2 y1 x2 x1 l m r 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 block diagram three types selector comparator voltage sensor key-switch detector z-axis counter counter multiplexer data i/o detector debounce comparator command status timing controller system clock generator rc & crystal oscillation 3 4 7 12 13 14 15 11 10 9 16 2 6 5 z1 z2 opt x1 x2 y1 y2 l m r oscr osc.out data clk
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 3 absolute maximum ratings (tamb=25 c, unless otherwise specified) characteristic symbol value unit temperature under bias t opr 0~70 c storage temperature range t str -65 ~ +150 c input voltage v in -0.3 ~ +6.0 v output voltage v o -0.3 ~ +6.0 v dc electrical characteristics (tamb=25~70 c) parameter symbol min typ max unit operating voltage v dd 4.5 5 5.5 v operating current (no load) iop -- -- 1.2 ma clk, data positive-going threshold voltage vt+ 0.6v dd -- 0.8 v dd v clk, data negative-going threshold voltage vt- 0.2 v dd -- 0.4 v dd v data, clk input current (pull up resistor) (vin=0v) idc 0.56 -- 1.86 ma data, clk low output voltage (iprl=-4ma) vprl -- -- 0.4 v x1, x2, y1, y2, z1, z2 (photo mode) low input reference current ipl 60 -- -- m a x1, x2, y1, y2, z1, z2 (photo mode) high input reference current iph -- -- 110 m a x1, x2, y1, y2, z1, z2 (photo mode) input current (input impedance) (80 m a) vpi 0.8 -- 1.2 v x1, x2, y1, y2, z1, z2 (photo mode) input current (input impedance) (500 m a) vpi 1.5 -- 2.8 v l, m, r, opt, z1, z2 (key mode) input low voltage vail -- -- 0.3 v dd v l, m, r, opt, z1, z2 (key mode) input high voltage vaih 0.7 v dd -- -- v l, m, r, z1, z2 (key & voltage mode) input resistor (vin=v dd ) rmi 92 -- 310 k w opt input resistor (vin=v dd ) rxi 133 -- 400 k w opt high output current (vin=v dd ) vopt 4.5 -- -- v l, m, r, x1, x2, y2, y2, z1, z2 input leakage current (vin=0v) iil 0 -- -1.0 m a v dd =4.5v 3.2 -- -- v dd =5v 4.5 -- -- v opt high output current (iopt=10ma) v dd =5.5v idc 5.5 -- --
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 4 note: 1. all voltage in above table are compared with vss. 2. all parameters in above table are tested under vdd=5v. 3. clk & data output gates are open drains that connect to pull up resistors. x1, x2, y1, y2 input impedance 0 1.0 2.0 3.0 4.0 5.0 5.0 unit:k max. typ. min. 7.0 8.0 9.0 6.0 2.0 3.0 4.0 1.0 10.0 15.0 16.0 12.0 13.0 14.0 11.0 voltage (lin) 10.0m ac electrical characteristics (tamb=25~70 c) parameter symbol min typ max unit oscillating frequency fosc 34.3-10% 34.3 34.3+10% khz key debounce tkd -- 12 -- ms rising edge crossed width fosc=35khz tr 14.3 -- -- m s falling edge crossed width tf 14.3 -- -- m s mouse clk active time tmca -- 42.9 -- m s mouse clk inactive time tmci -- 42.9 -- m s mouse sample data from clk rising edge tmdc -- 14.3 -- m s system clk active time tsca -- 42.9 -- m s system clk inactive time tsci -- 42.9 -- m s time from data transition to falling edge of clk tsdc -- 14.3 -- m s time from rising edge of clk to data transition tscd -- 28.6 -- m s time to mouse inhibit after the 11th clk to ensure mouse does not start another transmission tpi 0 -- 50 m s the ac timings are measured under using 35khz system clock signal.
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 5 pin description pin name i/o description opt i/o input: 200k w pull low to v ss . when opt is connected to v dd , sc84510 will enter test mode. in test mode, l will be the output of x1, while m will be the output of x2. toggling r key can change these output to be y1, y2 or z1, z2 respectively. output: 2khz z-axis led-driving source. 1 = v dd , 0 = floating high duty is about 60 m s. osc out o oscr i rc mode oscillation with 50k w resistor. clk i/o connect to 8042 auxiliary port clk line. data i/o connect to 8042 auxiliary port data line. r m l i three key-switches inputs. 200k w resistor pull low. x1 x2 y1 y2 i three step dynamic input impedance. use current comparator to measure photo-couples on, or off. z1 z2 i z-axis input. photo mode: three steps dynamic input impedance. current comparator input. key mode: 200k w resistor pull low. 7 levels increased by m key. voltage mode: 200k w resistor pull low. 7 levels voltage comparator. mechanical mode: 13.2k w resistor pull low. v ss negative power. v dd power line.
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 6 function descriptions 1. legacy ps/2 mouse operating (a) operating mode there are four operating modes in ps/2 mouse: (a) reset mode: in this mode a self-test is initiated during power-on or by a reset command. after reset signal, ps/2 mouse will send: a completion code aa & id code 00. b set default: * sampling rate: 100 reports/s * non-autospeed * stream mode * 2 dot/count * disable (b) stream mode: the maximum rate of transfer is the programmed sample rate. data report is transmitted if aswitchispressed b movement has been detect (c) remote mode: data is transmitted only in response to a read data command. (d) wrap mode: any byte of data sent by the system, except hex ec (reset wrap mode) or hex ff (reset), is returned by sc84510. (b) ps/2 mouse data report: (a) in stream mode: a data report is sent at the end of a sample interval. (b) in remote mode: a data report is sent in response to read data command. (c) data report format: byte bit description 1 0 left button status; 1 = pressed 1 right button status; 1 = pressed 2 middle button status; 1 = pressed 3 reserve 4 x data sign; 1 = negative 5 y data sign; 1 = negative 6 x data overflow; 1 = overflow 7 y data overflow; 1 = overflow 2 0~7 x data (d0~d7) 3 0~7 y data (d0~d7)
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 7 (c) ps/2 mouse data transmission: (a) sc84510 generates the clocking signal when sending data to and receiving data from the system. (b) the system requests sc84510 receive system data output by forcing the data line to an inactive level and allowingclklinetogotoanactivelevel. (c) data transmission frame: bit function 1 start bit (always 0) 2~9 data bits (d0~d7) 10 parity bit (odd parity) 11 stop bit (always 1) (d) data output (data from sc84510 to system): if clk is low (inhibit status), data is no transmission. if clk is high and data is low (request-to-send), data is updated. data is received from the system and no transmission are started by sc84510 until clk and data both high. if clk and data are both high, the transmission is ready. data is valid prior to the falling edge of clk and beyond the rising edge of clk. during transmission, sc84510 check for line contention by checking for an inactive level on clk at intervals not to exceed 100 m sec. contention occurs when the system lowers clk to inhibit sc84510 output after sc84510 has started a transmission. if this occurs before the rising edge of the tenth clock, sc84510 internal store its data in its buffer and returns data and clk to an active level. if the contention does not occur by the tenth clock, the transmission is complete. following a transmission, the system inhibits sc84510 by holding clk low until it can service the input or until the system receives a request to send a response from sc84510. (e) data input (from system to sc84510): system first check if sc84510 is transmitting data. if sc84510 is transmitting, the system can override the output forcing clk to an inactive level prior to the tenth clock. if sc84510 transmission is beyond the tenth clock, the system receives the data. if sc84510 is not transmitting or if the system choose to override the output, the system force clk to an inactive level for a period of not less than 100 m sec while preparing for output. when the system is ready to output start bit (0), it allows clk go to active level. if request-to-send is detected, sc84510 clocks 11 bits. following the tenth clock sc84510 checks for an active level on the data line, and if found, force data low, and clock once more. if occurs framing error, sc84510 continue to clock until data is high, then clocks the line control bit and request a resend. when the system sends out a command or data transmission that requires a response, the system waits for sc84510 to response before sending its next output.
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 8 (d) ps/2 mouse error handling: (a) a resend command (fe) following receipt of an invalid input or any input with incorrect parity. (b) if two invalid input are received in succession, an error code of hex fc send to the system. (c) the counter accumulators are cleared after receiving any command except resend. (d) sc84510 receives a resend command (fe), it transmit its last packet of data. (e) in the stream mode resend is received by sc84510 following a 3-byte data packet transmission to the system. sc84510 resend the 3-byte data packet prior to clearing the counter. (f) a response is sent within 25 ms if a the system requires a response b an error is detected in the transmission (g) when a command requiring a response is issued by the system, another command should not be issue until either the response is received or 25ms has passed. (e) ps/2 mouse commands description: there are 16 valid commands that transmits between the system and sc84510. the fa code is always the first response to any valid input received from the system other than a set wrap mode or resend command. the following table list the commands: the following describes valid commands: hex code command sc84510 echo code ff reset fa, aa, 00 fe resend xx, (xx, xx) f6 set default fa f5 disable fa f4 enable fa f3, xx set sampling rate fa, fa f2 read device type fa, 00 f0 set remote mode fa ee set wrap mode fa ec reset wrap mode fa eb read data fa, xx, xx, xx ea set stream mode fa e9 status request fa, xx, xx, xx e8, xx set resolution fa, fa e7 set auto-speed fa e6 reset auto-speed fa
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 9 the following describes valid command: (a) reset (ff) sc84510 operation: a completion the reset. b transmitted fa, aa, 00 to the system. c set default: sampling rate: 100 reports/s non-auto-speed stream mode 2 dots/count disable (b) resend (fe) a. any time sc84510 receives an invalid command; it returns a resend command to the system. b. when sc84510 receives a resend command, it retransmits its last packet of data. if the last packet was a resend command, it transmits the packet just prior to the resend command. c. in stream mode if a resend command is received by sc84510 immediately following a 3-byte data packet transmission to the system. (c) set default (f6) the command reinitializes all conditions to the power-on defaults. (d) disable (f5) this command is used in the stream mode to stop transmissions from sc84510. (e) enable (f4) begins transmissions, if in stream mode. (f) set sampling rate (f3, xx) in the stream mode, this command sets the sampling rate to the value indicated by byte hex xx, shown in following: second byte xx sample rate 0a 10/sec 14 20/sec 28 40/sec 3c 60/sec 50 80/sec 64 100/sec c8 200/sec
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 10 (g) read device type (f2) sc84510 always echoes fa, 00 following this command. (h) set remote mode (f0) data values are reported only in response to a read data command. (i) set wrap mode (ee) wrap mode remains until reset (ff) or reset wrap mode (ec) is received. (j) reset wrap mode (ec) sc84510 returns to the previous mode of operation after receiving this command. (k) read data (eb) this command is executed in either remote or stream mode. the data is transmitted even if there has been no movement since the last report or the button status is unchanged. following a read data command, the registers are cleared after a data transmission. (l) set stream mode (ea) this command sets sc84510 in stream mode. (m) status request (e9) when this command is issued by the system, sc84510 respond with a 3-byte status report as follows: byte bit description 1 0 1 = right button pressed 1 1 = middle button pressed 2 1 = left button pressed 3 reserved 4 0 = normal speed, 1 = auto-speed 5 0 = disabled, 1 = enabled 6 0 = stream mode, 1 = remote mode 7 reserved 2 0~7 current resolution setting (d0~d7) 3 0~7 current sampling rate (d0~d7) (n) set resolution (e8, xx) sc84510 provides four resolutions selected by the second byte of this command as follows: second byte xx resolution 00 8 dots/count 01 4 dots/count 02 2 dots/count 03 1 dot/count (o) set auto-speed (e7)
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 11 at the end of a sample interval in the stream mode, the current x and y data values are converted new values. the sign bits are not involved in this conversion. the conversion is only in stream mode. the relationship between the input and output count follows: input output 00 11 21 33 46 59 n( 3 6) 2.0*n (p) reset auto-speed (e6) this command restores normal speed. 2. microsoft ps/2 scrolling mouse mode: (a) entering procedure: except in wrap mode, while sc84520 received the following consecutive command. (a) f3 c8 ---- set sampling rate 200/sec (b) f3 64 ---- set sampling rate 100/sec (c) f3 50 ---- set sampling rate 80/sec (b) operating: (a) all of the command in legacy mode still is valid. (b) the id code of read device type command (f2) will changed from 00 to be 03. (c) data report will be four bytes format: byte bit description 1 0 left button status; 1 = pressed 1 right button status; 1 = pressed 2 middle button status; 1 = pressed 3 reserve 4 x data sign; 1 = negative 5 y data sign; 1 = negative 6 x data overflow; 1 = overflow 7 y data overflow; 1 = overflow 2 0 - 7 x data (d0 C d7) 3 0 - 7 y data (d0 C d7) 4 0 - 7 z data (d0 C d7)
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 12 (c) exiting microsoft scrolling mode: therearetwowaystoexit: (a) power off. (b)reset command (ff). 3. z-axis input funtion: the z0 ~ z7 limit value is 7 (a) photo couples input: z-axis counter accumulates the z1, z2 phase changed by movement. this mode includes noise immunity. z/1: 1 dot per count. z/4: 4 dots per count. counted by z1=1, z2=1 phase, the wheel should stay at z1=0, z2=0 phase. (b) key-switches input: pressing z1, z2 will start to fill the z-axis counter with the value beginning at one. toggling m key can increase the value any time by one. the limit value is 7. the relationship between the value and the transmission rate as follow: value rate per second 12.7 26.4 39.2 4 12.8 515 618 720 (c) voltage-sensing mode: there are 7 voltage levels in z1, z2 input. the transmission table is the same as key- switch mode. the relationship between the value of z-axis counter and the voltage as follows: value voltage 01v 1 1.0v C 1.6v 2 1.6v C 2.2v 3 2.2v - 2.8v 4 2.8v C 3.4v 5 3.4v C 4.0v 6 4.0v C 4.6v 74.6v - under v dd = 5v condition (d) mechanical mode: the function is the same as photo couples input mode, except there is no noise immunity. z/1: 1 dot per count. z/2: 2 dots per count. counted by z2 changing phase.
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 13 timing diagram tr tf x1(y1) x2(y2) clk data clk data inhibit start bit bit0-bit7 parity bit line control bit stop bit start bit bit0-bit7 parity bit stop bit tscl tsca tscd tsdc tpi tmdc tmca tmci 1st clk 2rd clk 9th clk 10th clk 11th clk 1st clk 2nd clk 10th clk 11th clk (2) ps/2 mouse (b) sending data (a) receiving data (1) photo-couples pulse width ac timing point v dd -2.6 v ss +0.4v +1.6v v ss v dd v ss +0.8v v dd -0.8v v ss l, m, r pin clk, data pin input: x1, x2, y1, y2 pin output: data clk pin
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 14 sc84510 i/o pin equivalent circuits clk: x1, x2, y1, y2: clk clk input signal clk input signal ps/2 mouse enable v cc x1,x2,y1,y2 phase digital signal v cc 13.2ko v cc v cc 13.2k 51k v pp/4 80 r, m, l: data: (r,l,m) internal signal (r,m,l) data data input signal data input signal ps/2 mouse enable v cc v cc
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 15 applications circuits 15 14 13 12 4 3 11 10 9 1 5 6 7 2 16 8 vdd clk data opt osc out vss oscr l m r z1 z2 x1 x2 y1 y2 sc84510a/e 51k 10 f 1 2 3 4 5 6 sc84510b 15 14 13 12 4 3 11 10 9 1 5 6 7 2 16 8 vdd clk data opt osc out vss oscr l m r z1 z2 x1 x2 y1 y2 51k 10 f 1 2 3 4 5 6
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 16 applications circuits (continued) 15 14 13 12 4 3 11 10 9 1 5 6 7 2 16 8 vdd clk data opt osc out vss oscr l m r z1 z2 x1 x2 y1 y2 sc84510cp 51k 10 f 1 2 3 4 5 6 15 14 13 12 4 3 11 10 9 1 5 6 7 2 16 8 vdd clk data opt osc out vss oscr l m r z1 z2 x1 x2 y1 y2 sc84510d/f 51k 10 f 1 2 3 4 5 6 a* b com
silan semiconductors sc84510 hangzhou silan microelectronics joint-stock co.,ltd rev: 1.0 2000.12.31 17 package outline dip-16-300-2.54 unit: mm 6.40 2.54 3.51 5.08 3.30 7.62 0.25 15 degree 0.46 19.4 1.50

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