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SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms product data sheet supersedes data of 2003 sep 03 2004 oct 06 integrated circuits
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2 2004 oct 06 general description the philips SA56004X is an smbus compatible, 11-bit remote/local digital temperature sensor with over temperature alarms. the remote channel of the sa56004 monitors a diode junction, such as a substrate pnp of a microprocessor or a diode connected transistor such as the 2n3904 (npn) or 2n3906 (pnp). with factory trimming, remote sensor accuracy of 1 c is achieved. under and over temperature alert thresholds can be programmed to cause the alert output to indicate when the on-chip or remote temperature is out of range. this output may be used as a system interrupt or smbus alert. the t_crit output is activated when the on-chip or remote temperature measurement rises above the programmed t_crit threshold register value. this output may be used to activate a cooling fan, send a warning or trigger a system shutdown. to further enhance system reliability, the SA56004X employs an smbus time-out protocol. the SA56004X has a unique device architecture which is patented (u.s. patent #6542020). the SA56004X is available in the so8 and tssop8 packages. SA56004X has 8 factory-programmed, device address options. the SA56004X is pin-compatible with the lm86, max6657/8, and adm1032. patents notice is herewith given that the subject device uses one or more of the following patents and that each of these patents may have corresponding patents in other jurisdictions: patent no. us 6,542,020 b2 e owned by koninklijke philips electronics n.v., eindhoven (nl). so8 tssop8 features ? accurately senses temperature of remote microprocessor thermal diodes or diode connected transistors within 1 c ? on-chip local temperature sensing ? 11-bit, 0.125 c resolution ? 8 different device addresses are available for server applications. the sa56004ed/edp with marking code 56004e/600e is address compatible with the national lm86, the max6657/8 and the adm1032. ? offset registers available for adjusting the remote temperature accuracy ? programmable under/overtemperature alarms: alert and t_crit ? smbus 2.0 compatible interface, supports timeout ? operating voltage range: 3.0 v to 3.6 v ? i 2 c-bus standard and fast mode compatible ? tssop8 and so8 packages ? programmable conversion rate (0.0625 hz to 26 hz) ? undervoltage lockout prevents erroneous temperature readings ? latch-up testing is done to jesdec standard jesd78 which exceeds 100 ma applications ? system thermal management in laptops, desktops, servers and workstations ? computers and office electronic equipment ? electronic test equipment & instrumentation ? hvac ? industrial controllers and embedded systems
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 3 simplified system diagram sl02018 1 2 3 4 8 7 6 5 v dd d+ d t_crit sclk sdata alert gnd SA56004X r 10 k w r 10 k w r 10 k w smbus controller gnd clock data int v dd v dd shielded twisted pair remote sensor fan control circuit +5 v 100 nf 2.2 nf (note 1) r 10 k w v dd 2n3904 (npn), 2n3906 (pnp), or similar standalone, asic, or mircroprocessor thermal diode note: 1. typical value; placed close to temperature sensor. figure 1. simplified system diagram. ordering information type number package version temperature type number name description version range sa56004 x d so8 plastic small outline package; 8 leads; body width 3.9 mm sot96-1 0 c to +125 c sa56004 x dp tssop8 plastic thin shrink small outline package; 8 leads; body width 3 mm sot505-1 0 c to +125 c note: there are 8 device slave address options (indicated by ` x ' in the type number, and described in table 1). table 1. device slave address options part number marking code device slave address 1 part number marking code device slave address 1 sa56004ad sa56004adp 56004a 6004a 1001000 sa56004ed 2 sa56004edp 2 56004e 6004e 1001100 sa56004bd sa56004bdp 56004b 6004b 1001001 sa56004fd sa56004fdp 56004f 6004f 1001101 sa56004cd sa56004cdp 56004c 6004c 1001010 sa56004gd sa56004gdp 56004g 6004g 1001110 sa56004dd sa56004ddp 56004d 6004d 1001011 sa56004hd sa56004hdp 56004h 6004h 1001111 notes: 1. the device slave address is factory-programmed in otp device address register. 2. the sa56004ed/edp has the bus address of the national lm86, max6657/8 and the adm1032.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 4 pin configuration so8 and tssop8 sl02014 1 2 3 4 8 7 6 5 top view v dd d+ d t_crit sclk sdata alert gnd SA56004X figure 2. pin configuration. pin description pin symbol description 1 v dd positive supply voltage. dc voltage from 3.0 v to 5.5 v. 2 d+ diode current source (anode). 3 d diode sink current (cathode). 4 t_crit t_crit alarm is open drain, active-low output which requires an external pull-up resistor. it functions as a system interrupt or power shutdown. 5 gnd power supply ground. 6 alert alert alarm is an open drain, active-low output which requires an external pull-up resistor. it functions as an interrupt indicating that the temperature of the on-chip or remote diode is above or below programmed over temperature or under temperature thresholds. 7 sdata smbus/i 2 c-bus bi-directional data line. this is an open drain output which requires an external pull-up resistor. 8 sclk smbus/i 2 c-bus clock input which requires an external pull-up resistor. maximum ratings all voltages are referenced to gnd. symbol parameter min. max. unit v dd supply voltage 0.3 +6 v voltage at sdata, sclk, alert , t_crit 0.3 +6 v v d+ voltage at positive diode input 0.3 v dd + 0.3 v v d voltage at negative diode input 0.3 +0.8 v sink current at sdata, sclk, alert , t_crit 1 50 ma i d+ d+ input current 1 1 ma p d power dissipation so8 package (derate 5.9 mw/ c above t amb = 70 c) 471 mw tssop8 package (derate 8.3 mw/ c above t amb = 70 c) 664 mw v esd esd human body model (note 1) 2000 v machine model (note 1) 200 v t j(max) maximum junction temperature +150 c t stg storage temperature range 65 +165 c notes: 1. the d+ and d pins are 1000 v hbm and 100 v mm due to the higher sensitivity of the analog pins that introduces a limitation to the circuit protection structure.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 5 electrical characteristics t amb = 0 c to +125 c, v dd = 3.0 v to 3.6 v, unless otherwise specified. symbol parameter conditions min. typ. max. unit t errl local temperature error t amb = 60 c to +100 c 2 1 +2 c t amb = 0 c to +125 c 3 +3 c t errr remote temperature error t amb = +25 c to +85 c; t rd = +60 c to +100 c 1 +1 c t amb = 0 c to +85 c; t rd = 0 c to +125 c 3 +3 c t resr remote temperature resolution 11 bits 0.125 c t resl local temperature resolution 11 bits 0.125 c t conv conversion time 38 ms v dd supply voltage 1 3.0 5.5 v i dd quiescent current during conversion, 16 hz conversion rate 500 m a shutdown current smbus inactive 10 m a i rd remote diode source current high setting: d+ d = +0.65 v 160 m a low setting 10 m a uvl undervoltage lockout (uvl) threshold voltage 2 v dd input disables a/d conversion 3 2.6 2.95 v power-on-reset (por) threshold voltage v dd , input falling edge 4 1.8 2.4 v local and remote alert high default temperature settings default values set at power-up +70 c local and remote alert low default temperature settings default values set at power-up 0 c local and remote t_crit default temperature settings default values set at power-up +85 c hystersis (t_crit ) default value set at power-up +10 c alert and t_crit output saturation voltage i out = 6.0 ma 0.4 v notes: 1. the SA56004X is optimized for 3.3 v dd operation. 2. definition of under voltage lockout (uvl): the value of v dd below which the internal a/d converter is disabled. this is designed to be a minimum of 200 mv above the power-on-reset. during the time that it is disabled, the temperature that is in the aread temperatu re registerso will remain at the value that it was before the a/d was disabled. this is done to eliminate the possibility of reading unexpect ed false temperatures due to the a/d converter not working correctly due to low voltage. in case of power-up (rising v dd ), the reading that is stored in the aread temperature registerso will be the default value of 0 c. v dd will rise to the value of the uvl, at which point the a/d will function correctly and the normal temperature will be read. 3. v dd (rising edge) voltage below which the a/d converter is disabled. 4. v dd (falling edge) voltage below which the logic is reset.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 6 smbus interface ac electrical characteristics v dd = 3.0 v to 3.6 v; t amb = 0 c to +125 c; unless otherwise noted. these specifications are guaranteed by design and not tested in production. symbol parameter conditions min. typ. max. unit v ih logic input high voltage for sclk, sdata v dd = 2.7 v to 5.5 v 2.2 v v il logic input low voltage for sclk, sdata v dd = 2.7 v to 5.5 v 0.8 v i ol logic output low sink current alert , t_crit ; v ol = 0.4 v 1.0 ma sdata; v ol = 0.6 v 6.0 ma i oh logic output high leakage current v oh = v dd 1.0 m a i ih , i il logic input currents v in = v dd or gnd 1.0 1.0 m a c i smbus input capacitance for sclk, sdata 5 pf smbus digital switching characteristics the switching characteristics of the SA56004X fully meet or exceed all parameters specified in smbus version 2.0. the following parameters specify the timing between the sclk and sdata signals in the SA56004X. they adhere to, but are not necessarily specified as the smbus specifications. f sclk sclk operating frequency 400 khz t low sclk low time 10% to 10% 4.7 5.0 m s t high sclk high time 90% to 90% 4.0 5.0 m s t buf smbus free time. delay from sdata stop to sdata start 4.7 m s t hd:sta hold time of start condition. delay from sdata start to first sclk h-l 10% of sdata to 90% of sclk 4.0 m s t hd:dat hold time of data. delay from sclk h-l to sdata edges 300 ns t su:dat set-up time of data in. delay from sdata edges to sclk l-h 250 ns t su:sta set-up time of repeat start condition. delay from sclk l-h to restart sdata 90% to to 90% 250 ns t su:sto set-up time of stop condition. delay from sclk h-l to sdata stop 90% of sclk to 90% of sdata 4.0 m s t r rise time of sclk and sdata 1 m s t f fall time of sclk and sdata 300 ns t of output fall time c l = 400 pf; i o = 3 ma 250 ns t timeout smbus timeout. low period for reset of smbus 25 35 ms t buf p s sclk sdata sl01204 t hd:sta sp t low t r t f t hd:sta t hd:dat t high t su:dat t su:sta t su:sto figure 3. timing measurements.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 7 performance curves i shutdown ( a) m sl02164 temperature ( c) 50 0 25 50 100 125 0 75 25 4 8 12 16 20 v dd = 3.6 v v dd = 3.3 v v dd = 5.5 v v dd = 3.0 v dd figure 4. typical i dd shutdown versus temperature and v dd i quiescent current ( a) m sl02157 temperature ( c) 50 0 25 50 100 125 100 75 25 150 200 250 300 400 v cc = 3.6 v v cc = 3.3 v v cc = 5.5 v v cc = 3.0 v dd 350 figure 5. typical i dd quiescent current versus temperature and v dd (conversion rate = 0.06 hz) i quiescent current ( a) m sl02158 temperature ( c) 50 0 25 50 100 125 200 75 25 300 400 500 600 700 v dd = 3.6 v v dd = 3.3 v v dd = 5.5 v v dd = 3.0 v dd figure 6. typical i dd quiescent current versus temperature and v dd (conversion rate = 16 hz) i quiescent current ( a) m sl02159 temperature ( c) 50 0 25 50 100 125 100 75 25 200 300 400 500 8.0 hz 4.0 hz 16 hz 2.0 hz dd 1.0 hz 0.25 hz 0.5 hz 0.12 hz 0.06 hz figure 7. typical i dd quiescent current versus temperature and conversion rate (v dd = 3.3 v)
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 8 i (ma) sl02160 temperature ( c) 50 0 25 50 100 125 2 75 25 4 6 8 10 14 v cc = 3.6 v v cc = 3.3 v v cc = 5.5 v v cc = 3.0 v ol 12 figure 8. typical t_crit i ol versus temperature and v dd (v ol = 0.4 v) i (ma) sl02161 temperature ( c) 50 0 25 50 100 125 4 75 25 5 6 7 8 10 v cc = 3.6 v v cc = 3.3 v v cc = 5.5 v v cc = 3.0 v ol 9 figure 9. typical alert i ol versus temperature and v dd (v ol = 0.4 v) uvl (v) sl02162 temperature ( c) 50 0 25 50 100 125 2.70 75 25 2.71 2.72 2.73 2.74 2.80 2.75 v cc = 3.3 v v cc = 3.6 v v cc = 5.5 v v cc = 3.0 v 2.76 2.77 2.78 2.79 figure 10. typical uvl versus temperature and v dd por (v) sl02163 temperature ( c) 50 0 25 50 100 125 1.0 75 25 1.2 1.4 1.6 1.8 2.6 2.2 2.0 2.4 figure 11. typical por versus temperature
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 9 block diagram smbus interface 11-bit s d atod converter local temp sensor local remote mux one-shot register conversion register local temp data register remote temp data register configuration register local high temp threshold local low temp threshold remote high temp threshold local temp high limit reg local temp low limit register remote temp high limit reg remote temp low limit reg remote low temp threshold status register t_crit interrupt command register alert iinterrupt otp device address register v dd d+ d alert t_crit gnd sdata sclk remote offset register control logic sl02015 t_crit hysteresis SA56004X figure 12. functional block diagram.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 10 functional description serial bus interface the SA56004X should be connected to a compatible two-wire serial interface system management bus (smbus) as a slave device using the two device terminals sclk and sdata. the alert pin can optionally be used with the smbus protocol to implement the ara response. the controller will provide a clock signal to the device sclk pin and write/read data to/from the device through the device sdata pin. external pull-up resistors, about 10 k w each, are needed for these device pins due to open drain circuitry. data of 8-bit digital byte or word are used for communication between the controller and the device using smbus 2.0 protocols which are described more in the `smbus interface' section on page 17. the operation of the device to the bus is described with details in the following sections. slave address the SA56004X has a 7-bit slave address register which is factory programmed in otp memory. eight unique devices are available with different slave addresses as defined in the `ordering information' section in table 1, `device slave address options'. up to eight devices can reside on the same smbus without conflict, provided that their addresses are unique. register overview the SA56004X contains three types of smbus addressable registers. these are read only (r), write only (w), and read-write (r/w). attempting to write to any r-only register or read data from any w-only register will produce an invalid result. some of the r/w registers have separate addresses for reading and writing operations. the registers of the SA56004X serve four purposes: ? control and configuration of the SA56004X ? status reporting ? temperature measurement storage ? id and manufacturer test registers. table 2 describes the names, addresses, power-on-reset (por), and functions of each register. the data of the temperature-related registers is in 2's complement format in which the msb is the sign bit. the 8-bit data of other registers is in 8-bit straight format. table 2. register assignments register name command byte por state function bits accessibility name read address write address state lthb 00h na 0000 0000 local temperature high byte 8 r rthb 01h na 0000 0000 remote temperature high byte 8 r sr 02h na 0000 0000 status register 8 r con 03h 09h 0000 0000 configuration register 8 r/w cr 04h 0ah 1000 conversion rate 4 r/w lhs 05h 0bh 0100 0110 local high setpoint 8 r/w lls 06h 0ch 0000 0000 local low setpoint 8 r/w rhshb 07h 0dh 0100 0110 remote high setpoint high byte 8 r/w rlshb 08h 0eh 0000 0000 remote low setpoint high byte 8 r/w one shot na 0fh writing register initiate a one shot conversion 0 w rtlb 10h na 0000 00 remote temperature low byte 6(msbs) r rtohb 11h 11h 0000 0000 remote temperature offset high byte 8 r/w rtolb 12h 12h 000 remote temperature offset low byte 3(msbs) r/w rhslb 13h 13h 000 remote high setpoint low byte 3(msbs) r/w rlslb 14h 14h 000 remote low setpoint low byte 3(msbs) r/w rcs 19h 19h 0101 0101 remote t_crit setpoint 8 r/w lcs 20h 20h 0101 0101 rlocal t_crit setpoint 8 r/w th 21h 21h 0 1010 t_crit hysteresis 5 r/w ltlb 22h na 0000 0000 local temperature low byte 3(msbs) r am bfh bfh 0 alert mode 1 r/w rmid feh na 1010 0001 read manufacturer's id 8 r rdr ffh na 0000 0000 read stepping or die revision 8 r
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 11 power-on-reset (por) when power is applied to the SA56004X, the device will enter into its power-on-reset state and its registers are reset to their default values. the configuration, status, and temperature-reading registers remain in these states until after the first conversion. as shown in table 2, this results in: 1. command register set to 00h. 2. local temperature register (lthb and ltlb) set to 0 c. 3. remote diode temperature register (rthb and rtlb) set to 0 c until the end of the first conversion. 4. status register (sr) set to 00h. 5. configuration register (con) set to 00h; interrupt latches are cleared, the alert and t_crit output drivers are off and the alert and t_crit pins are pulled high by the external pull-up resistors. 6. local t_crit temperature setpoints (lcs) and remote t_crit temperature setpoints (rcs) at 85 c. 7. local high setpoint (lhs) and remote high temperature setpoint (rhshb) at 70 c. 8. local low setpoint (lls) and remote low temperature setpoints (rlshb) at 0 c. 9. conversion rate register (cr) is set to 8h; the default value of about 16 conversions/s. starting conversion upon por, the run /stop bit 6 of the configuration register is zero (default condition), then, the device will enter into its free-running operation mode in which the device a/d converter is enabled and the measurement function is activated. in this mode, the device cycles the measurements of the local and remote temperature automatically and periodically. the conversion rate is defined by the programmable conversion rate stored in the conversion rate register. it also performs comparison between readings and limits of the temperature in order to set the flags and interruption accordingly at the end of every conversion. measured values are stored in the temp registers, results of the limit comparisons are reflected by the status of the flag bits in the status register and the interruption is reflected by the logical level of the alert and t_crit output. if the power-on temperature limit is not suitable, the temp limit values could be written into the limit registers during the busy-conversion duration of about 38 ms of the first conversion after power-up. otherwise, the status register must be read and the configuration bit 7 must be reset in order to recover the device from interruption caused by the undesired temp limits. low power software standby mode the device can be placed in a software standby mode by setting the run /stop bit 6 in the configuration register high (to 1). in standby, the free-running oscillator is stopped, the supply current is less than 10 m a if there is no smbus activity, all data in the registers is retained. however, the smbus is still active and reading and writing registers can still be performed. a one-shot command will initiate a single conversion which has the same effect as any conversion that occurs when the device is in its free-running mode. to restore the device to free running mode, set the run/stop bit 6 low (to 0). temperature data format the temperature data can only be read from the local and remote temperature registers; the setpoint registers (e.g. t_crit, low, high) are read/write. both local and remote temperature reading data is represented by an 11-bit, 2's complement word with the lsb (least significant bit) = 0.125 c. the temperature setpoint data for the remote channel is also represented by an 11-bit, 2's complement word with the lsb = 0.125 c. the temperature setpoint data for both the local channel and the t_crit setpoints are represented by 8-bit, 2's complement words with the lsb = 1.0 c. for 11-bit temp data, the data format is a left justified, 16-bit word available in two 8-bit registers (high byte and low byte). for 8-bit temp data, the data is available in a single 8-bit register (high byte only). table 3. temperature data format temperature digital output binary hex +125 c 0111 1101 0000 0000 7d00h +25 c 0001 1001 0000 0000 1900h +1 c 0000 0001 0000 0000 0100h +0.125 c 0000 0000 0010 0000 0020h 0 c 0000 0000 0000 0000 0000h 0.125 c 1111 1111 1110 0000 ffe0h 1 c 1111 1111 0000 0000 ff00h 25 c 1110 0111 0000 0000 e700h 55 c 1100 1001 0000 0000 c900h
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 12 sa56004 smbus registers command register the command register selects which register will be read or written to. data for this register should be transmitted during the command byte of the smbus write communication. local and remote temperature registers (lthb, ltlb, rthb, rtlb) table 4. local and remote temperature registers bit assignment high byte (read only address 00h, 01h) bit d7 d6 d5 d4 d3 d2 d1 d0 value sign 64 32 16 8 4 2 1 low byte (read only address 10h) bit d7 d6 d5 d4 d3 d2 d1 d0 value 0.5 0.25 0.125 0 0 0 0 0 configuration register the configuration register is an 8-bit register with read address 03h and write address 09h. table 5 shows how the bits in this register are used. table 5. configuration register (con) bit assignments bit name/function por state 7 (msb) alert mask the alert interrupt is enabled when this bit is low. the alert interrupt is disabled (masked) when this bit is high. 0 6 run /stop standby or run mode control: running mode is enabled when this bit is low. the SA56004X is in standby mode when this bit is high. 0 5 not defined. defaults to a0o (zero). 0 4 remote t_crit mask the t_crit output will be activated by a remote temperature that exceeds the remote t_crit setpoint when this bit is low. the t_crit output will not be activated under this condition when this bit is high. 0 3 not defined. defaults to a0o (zero). 0 2 local t_crit mask the t_crit output will be activated by a local temperature that exceeds the local t_crit setpoint when this bit is low. the t_crit output will not be activated under this condition when this bit is high. 0 1 not defined. defaults to a0o (zero). 0 0 fault queue a single remote temperature measurement outside the high, low or t_crit setpoints will trigger an outside limit condition resulting in setting the status bits and associated output pins when this bit is low. three consecutive measurements outside of one of these setpoints are required to trigger an outside of limit condition when this bit is high. 0 status register the contents of the status register reflects condition status resulting from all activities: comparison between temperature measurements and temperature limits, the status of a/d conversion, and the hardware condition of external diode to the device. bit assignments are listed in table 6. this register is read only and its address is 02h. upon por, all bits are set to zero. note: any one of the fault conditions, with the exceptions of diode open and a/d busy, introduces an alert interrupt (see alert interrupt section on page 14). also, whenever a one-shot command is executed, the status byte should be read after the conversion is completed, which is about 38 ms (1 conversion time period) after the one-shot command is sent.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 13 table 6. status register (sr) bit assignment read only address 02h bit name/function por state 7 busy when `1' a/d is busy converting. n/a 6 lhigh when `1' indicates local high temperature alarm. 0 5 llow when `1' indicates a local low temperature alarm. 0 4 rhigh when `1' indicates a remote diode high temperature alarm. 0 3 rlow when `1' indicates a remote diode low temperature alarm. 0 2 open when `1' indicates a remote diode disconnect. 0 1 rcrit when `1' indicates a remote diode critical temperature alarm. 0 0 lcrit when `1' indicates a local critical temperature alarm. 0 conversion rate register the conversion rate register is used to store programmable conversion data, which defines the time interval between conversions in the standard free-running auto convert mode. table 7 shows all applicable data values and rates for the SA56004X. only the 4 lsbs of the register are used and the other bits are reserved for future use. the register is r/w using the read address 04h and write address 0ah. the por default conversion data is 08h. table 7. conversion rate control byte (cr) data value conversion rate (hz) 00h 0.06 01h 0.12 02h 0.25 03h 0.50 04h 1.0 05h 2 06h 4 07h 8 08h 16 09h 32 0ah to ffh n/a temperature limit registers table 8. local and remote high setpoint registers (lhs, rhshb, and rhslb) high byte (read only address 05h, 07h / write address 0bh, 0dh) bit d7 d6 d5 d4 d3 d2 d1 d0 value sign 64 32 16 8 4 2 1 por default = lhs = rhshv = 46h (70 c). low byte (read/write address 13h) bit d7 d6 d5 d4 d3 d2 d1 d0 value 0.5 0.25 0.125 0 0 0 0 0 por default rhslb = 00h. table 9. local and remote low setpoint registers (lls, rlshb, and rlslb) high byte (read address 06h, 08h / write address 0ch, 0eh) bit d7 d6 d5 d4 d3 d2 d1 d0 value sign 64 32 16 8 4 2 1 por default lls = rlshb = 00h. low byte (read/write address 14h) bit d7 d6 d5 d4 d3 d2 d1 d0 value 0.5 0.25 0.125 0 0 0 0 0 por default rlslb = 00h (0 c). table 10. local and remote t_crit registers (lcs and rcs) single high byte (read/write address 20h, 19h) bit d7 d6 d5 d4 d3 d2 d1 d0 value sign 64 32 16 8 4 2 1 por default lcs = rcs = 55h (85 c). table 11. t_crit hyster esis register (th) single high byte (read and write address 21h) bit d7 d6 d5 d4 d3 d2 d1 d0 value 16 8 4 2 1 por default th = 0ah (10 c).
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 14 programmable offset register (remote only) table 12. remote temperature offset registers (rtohb and rtolb) high byte (read/write address 11h) bit d7 d6 d5 d4 d3 d2 d1 d0 value sign 64 32 16 8 4 2 1 por default rtohb = rtolb = 00h. low byte (read/write address 12h) bit d7 d6 d5 d4 d3 d2 d1 d0 value 0.5 0.25 0.125 0 0 0 0 0 por default rtolb = 00h. alert mode register table 13. alert mode register (am) (read and write address bfh) bit d7 d6 d5 d4 d3 d2 d1 d0 value 0 0 0 0 0 0 0 alert mode d7-d1: is not defined and defaults to `0'. d0: the alert output is in interrupt mode when this bit is low. the alert output is in comparator mode when this bit is high. other registers the manufacturers id register has a default value a1h (1010 0001) and a read address feh. the die revision code register has a default value 00h (0000 0000) and read address ffh. this register will increment by 1 every time there is a revision to the die. one-shot register the one-shot register is used to initiate a single conversion and comparison cycle when the device is in the standby mode; upon completion of the single conversion cycle the device returns to the standby mode. it is not a data register; it is the write operation that causes the one-shot conversion. the data written to this register is not stored; a ff value will always be read from this register. to initiate an one-shot operation, send a standard write command with the command byte of 0fh (one-shot write address). interruption logic functional description alert output the alert output is used to signal alert interruptions from the device to the smbus or other system interrupt handler and it is active low. because this is an open drain output, a pull-up resistor (typically 10 k w ) to v dd is required. several slave devices can share a common interrupt line on the same smbus. the alert function is very versatile and accommodates three separate operating modes: 1) a temperature comparator, 2) a system interrupt based on temperature, and 3) an smbus alert response address (ara) response. the ara and interrupt modes are different only in how the user interacts with the SA56004X. at the end of every temperature reading, digital comparators determine if the readings are above the high or t_crit setpoint or below the low setpoint register values. if so, the corresponding bit in the status register is set. if the alert mask bit 7 of the configuration register is not high, then, any bit set in the status register, other than the busy (d7) and open (d2), will cause the alert output pin to be active-low. an alert will be triggered after any conversion cycle that finds the temperature is out of the limits defined by the setpoint registers. in order to trigger an alert in all alert modes, the alert mask bit 7 of the configuration register must be cleared (not high). alert output in comparator mode when operating the SA56004X in a system that utilizes a smbus controller not having an interrupt, the alert output may be operated as a temperature comparator. in this mode, when the condition that triggered the alert to be asserted is no longer present, the alert output is released as it goes high. in order to use the alert output as a temperature comparator, bit d0, the alert configure bit, in the alert mode (am) register must be set high. this is not the por default. alert output in interrupt mode in the interrupt mode, the alert output is used to provide an interrupt signal that remains asserted until the interrupt service routine has elapsed. in the interrupt operating mode, a read of the status register will set the alert mask bit 7 of the configuration register if any of the temperature alarm bits of the status register is set with exception of busy (d7) and open (d2). this protocol prevents further alert output triggering until the master device has reset the alert mask bit at the end of the interrupt service routine. the status register bits are cleared only upon a read of the status register by the serial bus master (see figure 13). in order for the alert output to be used as an interrupt, the alert configure bit d0 of the alert mode (am) register must be set low. note, this is the por default. remote temp high limit SA56004X status register bit 4(rhigh) remote diode temp a b,c d alert pin sr02502 e, f figure 13. alert output in interrupt mode the following events summarizes the alert output interrupt mode of operation: event a: master senses alert output being active-low. event b: master reads the SA56004X status register to determine what cause the alert interrupt. event c: SA56004X clears the status register, resets the alert output high, and sets the alert mask bit 7 in the configuration register. event d: a new conversion result indicates the temperature is still above the high limit, however the alert pin is not activated due to the alert mask.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 15 event e: master should correct the conditions that caused the alert output to be triggered. for instance, the fan is started, setpoint levels are adjusted. event f: master resets the alert mask bit 7 in the configuration register. alert output in smbus alert mode when several slave devices share a common interrupt line, an smbus alert line is implemented. the SA56004X is designed to accommodate the alert interrupt detection capability of the smbus 2.0 alert response address (ara) protocol, defined in smbus specification 2.0 . this procedure is designed to assist the master in resolving which slave device generated the interrupt and in servicing the interrupt while minimizing the time to restore the system to its proper operation. basically, the smbus provides alert response interrupt pointers in order to identify slave devices which have caused the alert interrupt. when the ara command is received by all devices on the smbus, the devices pulling the smbus alert line low send their device addresses to the master; await an acknowledgement and then release the alert line. this requirement to disengage the smbus alert line prevents locking up the alert line. the SA56004X complies with this ara disengagement protocol by setting the alert mask bit 7 in the configuration register at address 09h after successfully sending out its address in response to an ara command and releasing the alert output. once the mask bit is activated, the alert output will be disabled until enabled by software. in order to enable the alert the master must read the status register, at address 02h, during the interrupt service routine and then reset the alert mask bit 7 in the configuration register to `0' at the end of the interrupt service routine (see figure 14). in order for the SA56004X to respond to the ara command, the bit d0 in the alert mode register must be set low. alert mask bit 7 and the alert mode bit d0 are both low for the por default. remote temp high limit SA56004X status register bit 4(rhigh) remote diode temp temperature abc d alert pin sl02057 figure 14. alert pin in smbus alert mode the following events summarize the alert output interrupt operation in the smbus alert mode: event a: master senses the alert line being low. event a to b: master sends a read command using the common 7-bit alert response address (ara) of 0001 100. event a to b: alerting device(s) return ack signal and their addresses using the i 2 c arbitration (the device with the lowest address value sends its address first. the master can repeat the alert reading process and work up through all the interrupts). event b: upon the successful completion of returning address, the SA56004X resets its alert output (to off) and sets the alert mask bit 7 in its configuration register. event c: master should read the device status register to identify and correct the conditions that caused the alert interruption. the status register is reset. event d: master resets the alert mask bit 7 in the configuration register to enable the device alert output interruption. note: the bit assignment of the returned data from the ara reading is listed in table 14. if none of the device on the bus is alerted then the returned data from ara reading will be ffh (1111 1111). table 14. alert response bit assignment alert response bit device address bit function 7 (msb) add6 address bit 6 (msb) of alerted device 6 add5 address bit 5 of alerted device 5 add4 address bit 4 of alerted device 4 add3 address bit 3 of alerted device 3 add2 address bit 2 of alerted device 2 add1 address bit 1 of alerted device 1 add0 address bit 0 of alerted device 0 1 always `1'
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 16 t_crit output the t_crit output is low when any temperature reading is greater than the preset limit in the corresponding critical temperature setpoint register. when one of the t_crit setpoint temperatures is exceeded, the appropriate status register bit, 1 (rcrit) or 0 (lcrit), is set. after every local and remote temperature conversion the status register flags and the t_crit output are updated. figure 15 is a timing diagram showing the relationship of t_crit output, status bit 1 (rcrit) and the remote critical temperature setpoint (rcs), and critical temperature hysteresis (th) with remote temperature changes. note that the t_crit output is de-activated only after the remote temperature is below the remote temperature setpoint, rcs minus the hysteresis, th. in the interrupt mode only, the status register flags are reset after the status register is read. rcs rcs - th status bit 1, rcrit t_crit output remote temperature a bc sl02058 figure 15. t_crit temperature response timing diagram event a: t_crit goes low and status bit 1, rcrit is set high when remote temperature exceeds rcs, remote t_crit setpoint. event b: remote temperature goes below rcs-th. t_crit is deactivated, but status register remains unchanged. event c: the status register bit 1, rcrit is reset by a read of the status register (in the interrupt mode). fault queue to suppress erroneous alert or t_crit triggering, the SA56004X implements a fault queue for both local and remote channel. the fault queue insures a temperature measurement is genuinely beyond a high, low or t_crit setpoint by not triggering until three consecutive out-of-limit measurements have been made. the fault queue defaults off upon por and may be activated by setting bit 0 in the configuration register (address 09h) to `1'. remote high setpoint remote low setpoint rcs alert output rcs -th remote temperature t_crit output abc de f g h events i sl02059 note: all events indicate the completion of a conversion. figure 16. fault queue remote high and low and t_crit, t_crit hysteresis setpoint response (comparator mode) at event a: the remote temperature has exceeded the remote high setpoint. at event b: three consecutive over limit measurements have been made exceeding the remote high setpoint; the alert output is activated (goes low). by now, the remote temp has exceeded the remote t_crit setpoint (rcs). at event c: three consecutive over limit measurements have been made exceeding rcs; the t_crit output is activated (goes low). at event d: the remote temperature falls below the rcsth setpoint. at event e: the alert output is de-activated (goes high) after a below_high_limit temperature measurement is completed. at event f: three consecutive measurements have been made with the remote temperature below the rcsth threshold; the t_crit output is de-activated (goes high). at event g: the remote temp falls below the remote low setpoint. at event h: three consecutive measurements are made with the temp below the remote low setpoint; alert output is activated (goes low). at event i: the alert output is de-activated (goes high) after a above_low_limit temperature measurement is completed.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 17 remote diode selection to measure the remote temperature or the temperature of an externally attached diode, the device automatically forces two successive currents of about 160 m a and 10 m a at d+ pin. it measures the voltage (vbe) between d+ and d, detects the difference between the two vbes or the d vbe and then converts the d vbe into a temperature data using the basic ptat voltage formula as shown below. the device typically takes about 38 ms to perform a measurement during each conversion period or cycle, which is selectable by programming the conversion rate register. vbe n kt q ln i2 i1 where: n: diode ideality factor k: boltzmann's constant t: absolute temperature ( k) = 273 c + t ( c) q: electron charge ln: natural logarithm i2, i1: two source currents because the device does not directly convert the sensed vbe as in the old method of temperature measurement systems, the vbe calibration is not required. furthermore, the device remote temperature error is adjusted at the manufacturer to meet the specifications with the use of the reference diode-connected transistors such as the 2n3904/2n3906. the diode type to be used in customer applications must have the characteristics as close to the 2n3904/2n3906 as possible in order to obtain optimal results. finally, to prevent the effects of system noise on the measured vbe signals, an external capacitor of about 2200 pf connected between the d+ and d pins as well as the grounded-shield cable for the diode connection wires are recommended. diode fault detection the SA56004X is designed with circuitry to detect the fault conditions of the remote diode. when the d+ pin is shorted to v dd or floating, the remote temperature high byte (rthb) register is loaded with +127 c, the remote temperature low byte (rtlb) register is loaded with 0 c, and the open bit (bit 2 of the status register) is set. under the above conditions of d+ shorted to v dd or floating, if the remote t_crit setpoint is set less than +127 c, and t_crit mask are disabled, then, the t_crit output pins will be pulled low. furthermore, if the remote high setpoint high byte (rhshb) register is set to a value less than +127 c and the alert mask is disabled, then the alert output will be pulled low. note: the open bit itself will not trigger an alert. when the d+ pin is shorted to ground or to d, the remote temperature high byte (rthb) register is loaded with 128 c (1000 0000) and the open (bit 2 in the status register) will not be set. since operating the SA56004X is beyond its normal limits, this temperature reading represents this shorted fault condition. if the value in the remote low setpoint high byte (rlshb) register is more than 128 c and the alert mask is disabled, the alert output will be pulled low. smbus interface the device can communicate over a standard two-wire serial interface system management bus (smbus) or compatible i 2 c-bus using sclk and sdata. the device employs four standard smbus protocols: write byte, read byte, receive byte, and send byte. data formats of four protocols are shown in figure 17. the following key points of protocol are important: 1. the smbus master initiates data transfer by establishing a start condition (s) and terminates data transfer by generating a stop condition (p). 2. data is sent over the serial bus in sequences of 9 clock pulses according to each 8-bit data byte followed by 1-bit status of device acknowledgement (a). 3. the 7-bit slave address is equivalent to factory-programmed address of the device. 4. the command byte is equivalent to the address of the selected device register. 5. the receive byte format is used for quicker transfer data from a device reading register which was previously selected. serial interface reset if the smbus master attempts to reset the SA56004X while the SA56004X is controlling the data line and transmitting on the data line, the SA56004X must be returned to a known state in the communication protocol. this may be accomplished in two ways: 1. when the sdata is low, the SA56004X smbus state machine resets to the smbus idle state if sclk is held low for more than 35 ms (maximum timeout period). according to smbus specification 2.0 , all devices are required to time-out when the sclk line is held low for 25 to 35 ms. therefore, to insure a time-out of all devices on the bus, the sclk line must be held low for at least 35 ms. 2. when the sdata is high, the master initiates an smbus start. the SA56004X will respond properly to a smbus start condition only during the data retrieving cycle. after the start, the SA56004X will expect a smbus address byte.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 18 sl02016 write byte format (to write a data byte to the device register) : 123456789123456789 sclk (to next) sdata a6 a5 a4 a3 a2 a1 (to next) swa a (cont) (cont) device address device register command a0 d7 d6 d5 d4 d3 d2 d1 d0 123456789 sclk sdata d7 d6 d5 d4 d3 d2 p a data to be written to rgtr d1 d0 read byte format (to read a data byte from the device register) : 123456789123456789 sclk (to next) sdata a6 a5 a4 a3 a2 a1 (to next) swa a (cont) (cont) device address device register command a0 d7 d6 d5 d4 d3 d2 d1 d0 123456789 sclk sdata a6 a5 a4 a3 a2 a1 a device address a0 p 123456789 stop restart s r na data from device register d7 d6 d5 d4 d3 d2 d1 d0 p stop receive byte format (to read a data byte from already pointed register) : (cont) (cont) 123456789 sclk sdata a6 a5 a4 a3 a2 a1 a device address a0 123456789 restart s r na data from device register d7 d6 d5 d4 d3 d2 d1 d0 p send byte format: 123456789123456789 sclk sdata a6 a5 a4 a3 a2 a1 swa a device address device register command a0 d7 d6 d5 d4 d3 d2 d1 d0 p stop figure 17. smbus interface protocols.
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 19 printed circuit board layout considerations care must be taken in pcb layout to minimize noise induced at the remote temperature sensor inputs, especially in extremely noisy environments, such as a computer motherboard. noise induced in the traces running between the device sensor inputs and the remote diode can cause temperature conversion errors. typical sensor signal levels to the SA56004X is a few microvolts. the following guidelines are recommended: 1. place the SA56004X as close as possible to the remote sensor. it can be from 4 to 8 inches, as long as the worst noise sources such as clock generator, data and address buses, crts are avoided. 2. route the d+ and d lines parallel and close together with ground guards enclosing them (see `ideal diode trace layout', figure 18). 3. leakage currents due to pc board contamination must be considered. error can be introduced by these leakage currents. 4. use wide traces to reduce inductance and noise pickup. narrow traces more readily pickup noise. the minimum width of 10 mil and space of 10 mil are recommended. 5. place a bypass capacitor of 10 nf close to the v dd pin and an input filter capacitor of 2200 pf close to the d+ and d pins. 6. a shielded twisted pair is recommended if remote sensor is located several feet away from the temperature sensor. under this circumstance, connect the shield of the cable at the device side to the SA56004X gnd pin and leave the shield at the remote end unconnected to avoid ground loop currents. also notice that the series resistance of the cable may introduce measurement error; 1 w can introduce about 0.5 c. gnd d+ d gnd sl02017 figure 18. d+ and d trace layout. packing method the SA56004X is packed in reels, as shown in figure 19. sl01305 tape detail cover tape carrier tape reel assembly tape guard band barcode label box figure 19. tape and reel packing method
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 20 so8: plastic small outline package; 8 leads; body width 3.9 mm sot96-1
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 21 tssop8: plastic thin shrink small outline package; 8 leads; body width 3 mm sot505-1
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 22 revision history rev date description _3 20041006 product data sheet (9397 750 13841). supersedes objective data of 2003 sep 03 (9397 750 12015). modifications: ? change data sheet status from aobjective datao to aproduct datao ? afeatureso section: 4 th bullet: change marking code from aarwo to a56004e/600eo add (new) 8 th bullet add (new) 13 th bullet ? figure 1, asimplified system diagramo modified. ? table 1: add marking codes ? amaximum ratingso table: add v esd ratings, and note 1. ? aelectrical characteristicso table: change description line below title from at amb = 25 c, ...o to at amb = 0 c to +125 c, ...o symbol i dd , quiescent current: change condition from a26 hz conversion rateo to a16 hz conversion rateo ? change section atechnical descriptiono, ageneral discussiono to ablock diagramo ? figure 4 modified. ? table 5: change title from aconfiguration register (cr) bit assignmentso to aconfiguration register (con) bit assignmentso ? section acustomer programmable offset register (remote only)o renamed to aprogrammable offset register (remote only)o ? add section aremote diode selectiono ? section aprinted circuit board layout considerationso: list item #6 re-written. _2 20030903 objective data (9397 750 12015). replaces sa56004-x_1 dated 2003 aug 19 (9397 750 10993). _1 20030819 objective data (9397 750 10993).
philips semiconductors product data sheet SA56004X 1 c accurate, smbus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 oct 06 23 purchase of philips i 2 c components conveys a license under the philips' i 2 c patent to use the components in the i 2 c system provided the system conforms to the i 2 c specifications defined by philips. this specification can be ordered using the code 9398 393 40011. definitions short-form specification e the data in a short-form specification is extracted from a full data sheet with the same type number and title. for detailed i nformation see the relevant data sheet or data handbook. limiting values definition e limiting values given are in accordance with the absolute maximum rating system (iec 60134). stress above one or more of the l imiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any o ther conditions above those given in the characteristics sections of the specification is not implied. exposure to limiting values for extended periods may affec t device reliability. application information e applications that are described herein for any of these products are for illustrative purposes only. philips semiconductors ma ke no representation or warranty that such applications will be suitable for the specified use without further testing or modificatio n. disclaimers life support e these products are not designed for use in life support appliances, devices, or systems where malfunction of these products ca n reasonably be expected to result in personal injury. philips semiconductors customers using or selling these products for use in such applica tions do so at their own risk and agree to fully indemnify philips semiconductors for any damages resulting from such application. right to make changes e philips semiconductors reserves the right to make changes in the productseincluding circuits, standard cells, and/or softwaree described or contained herein in order to improve design and/or performance. when the product is in full production (status `production') , relevant changes will be communicated via a customer product/process change notification (cpcn). philips semiconductors assumes no responsibility or liability for th e use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranti es that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. contact information for additional information please visit http://www.semiconductors.philips.com . fax: +31 40 27 24825 for sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com . ? koninklijke philips electronics n.v. 2004 all rights reserved. printed in u.s.a. date of release: 10-04 document order number: 9397 750 13841

data sheet status [1] objective data preliminary data product data product status [2] [3] development qualification production definitions this data sheet contains data from the objective specification for product development. philips semiconductors reserves the right to change the specification in any manner without notice. this data sheet contains data from the preliminary specification. supplementary data will be published at a later date. philips semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. this data sheet contains data from the product specification. philips semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. relevant changes will be communicated via a customer product/process change notification (cpcn). data sheet status [1] please consult the most recently issued data sheet before initiating or completing a design. [2] the product status of the device(s) described in this data sheet may have changed since this data sheet was published. the l atest information is available on the internet at url http://www.semiconductors.philips.com. [3] for data sheets describing multiple type numbers, the highest-level product status determines the data sheet status. level i ii iii

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