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general description the max6698 precision multichannel temperature sen-sor monitors its own temperature, the temperatures of three external diode-connected transistors, and the temperatures of three thermistors. all temperature channels have programmable alert thresholds. channels 1, 4, 5, and 6 also have programmable over- temperature thresholds. when the measured tempera- ture of a channel exceeds the respective threshold, a status bit is set in one of the status registers. two open- drain outputs, overt and alert , assert correspond- ing to these bits in the status register.the 2-wire serial interface supports the standard system management bus (smbus) protocols: write byte, read byte, send byte, and receive byte for reading the tem- perature data and programming the alarm thresholds. the max6698 is specified for an operating temperature range of -40? to +125? and is available in 16-pin qsop and 16-pin tssop packages. applications desktop computers workstations notebook computers servers features ? three thermal-diode inputs and three thermistorinputs ? local temperature sensor ? 1c remote temperature accuracy (+60c to+100c) ? temperature monitoring begins at por for fail-safe system protection ? alert and overt outputs for interrupts, throttling, and shutdown ? small 16-pin qsop and 16-pin tssop packages ? 2-wire smbus interface max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ________________________________________________________________ maxim integrated products 1 ordering information 16 +3.3v 1514 13 12 11 10 9 12 3 4 5 6 r ex3 r ther3 78 gnd smbclk smbdata dxn2 dxp2 dxn1 dxp1 v cc ther1ther2 vref ther3 dxn3 dxp3 max6698 alert overt r ex2 r ther2 r ex1 r ther1 typical application circuit 19-3476; rev 3; 8/07for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available part temp range pin-package pkgcode max6698ee_ _ -40? to +125? 16 qsop e16-1 max6698ue_ _ -40? to +125? 16 tssop u16-1 smbus is a trademark of intel corp. pin configuration appears at end of data sheet. * see the slave address section. downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc , scl, sda, alert , overt to gnd ................-0.3v to +6v dxp_ to gnd..............................................-0.3v to (v cc + 0.3v) dxn_ to gnd ........................................................-0.3v to +0.8v ther_ to gnd..........................................................-0.3v to +6v vref to gnd............................................................-0.3v to +6v sda, alert , overt current .............................-1ma to +50ma dxn current .......................................................................?ma continuous power dissipation (t a = +70?) 16-pin qsop (derate 8.3mw/? above +70?) ......................666.7mw(e16-1) 16-pin tssop (derate 9.4mw/? above +70?) ....................754.7mw(u16-1) esd protection (all pins, human body model) ................?000v operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-60? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v cc = +3.0v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 1) parameter symbol conditions min typ max units supply voltage v cc 3.0 5.5 v standby supply current i ss smbus static 30 ? operating current i cc during conversion 500 1000 ? channel 1 only 11 temperature resolution other diode channels 8 bits t a = t rj = +60? to +100? -1.0 +1.0 t a = t rj = 0? to +125? -3.0 +3.0 remote temperature accuracy v cc = 3.3v dxn_ grounded,t rj = t a = 0? to +85? ?.5 o c t a = +60? to +100? -2.5 +2.5 local temperature accuracy v cc = 3.3v t a = 0? to +125? -3.5 +3.5 o c supply sensitivity of temperatureaccuracy 0.2 o c/v resistance cancellation on 95 125 156 remote channel 1 conversiontime t conv1 resistance cancellation off 190 250 312 ms remote channels 2 through 6conversion time t conv_ 95 125 156 ms high level 80 100 120 remote-diode source current i rj low level 8 10 12 ? undervoltage-lockout threshold uvlo falling edge of v cc disables adc 2.3 2.80 2.95 v undervoltage-lockout hysteresis 90 mv power-on reset (por) threshold v cc falling edge 1.2 2.0 2.5 v por threshold hysteresis 90 mv thermistor conversion voltage-measurement accuracy -1 +1 %full scale conversion time 31 ms thermistor reference voltage v ref 1v downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor _______________________________________________________________________________________ 3 electrical characteristics (continued)(v cc = +3.0v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 1) parameter symbol conditions min typ max units reference-load regulation 0ma < i ref < 2ma 0.4 % reference-supply rejection 0.5 %/v alert , overt i sink = 1ma 0.3 output low voltage v ol i sink = 6ma 0.5 v output leakage current 1 a smbus interface (scl, sda) logic-input low voltage v il 0.8 v v cc = 3.0v 2.2 v logic-input high voltage v ih v cc = 5.0v 2.4 v input leakage current -1 +1 ? output low voltage v ol i sink = 6ma 0.3 v input capacitance c in 5p f smbus-compatible timing (figures 3 and 4) (note 2) serial clock frequency f scl (note 3) 400 khz f scl = 100khz 4.7 bus free time between stopand start condition t buf f scl = 400khz 1.6 ? f scl = 100khz 4.7 start condition setup time f scl = 400khz 0.6 ? 90% of scl to 90% of sda, f scl = 100khz 0.6 repeat start condition setuptime t su:sta 90% of scl to 90% of sda, f scl = 400khz 0.6 ? start condition hold time t hd:sta 10% of sda to 90% of scl 0.6 ? 90% of scl to 90% of sda, f scl = 100khz 4 stop condition setup time t su:sto 90% of scl to 90% of sda, f scl = 400khz 0.6 ? 10% to 10%, f scl = 100khz 1.3 clock low period t low 10% to 10%, f scl = 400khz 1.3 ? clock high period t high 90% to 90% 0.6 ? f scl = 100khz 300 data hold time t hd:dat f scl = 400khz (note 4) 900 ns f scl = 100khz 250 data setup time t su:dat f scl = 400khz 100 ns f scl = 100khz 1 receive scl/sda rise time t r f scl = 400khz 0.3 ? receive scl/sda fall time t f 300 ns pulse width of spike suppressed t sp 05 0 n s smbus timeout t timeout sda low period for interface reset 25 37 45 ms note 1: all parameters are tested at t a = +25?. specifications over temperature are guaranteed by design. note 2: timing specifications are guaranteed by design. note 3: the serial interface resets when scl is low for more than t timeout . note 4: a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of scl? falling edge. downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 4 _______________________________________________________________________________________ typical operating characteristics (v cc = 3.3v, t a = +25?, unless otherwise noted.) standby supply current vs. supply voltage max6698 toc01 supply voltage (v) standby supply current ( a) 5.3 4.8 4.3 3.8 1 2 3 4 5 6 7 8 9 10 11 12 0 3.3 supply current vs. supply voltage max6698 toc02 supply voltage (v) supply current ( a) 5.3 4.8 3.8 4.3 325 330 335 340 350345 355 360320 3.3 -4 -2-3 0 -1 21 3 05 0 25 75 100 125 remote temperature error vs. remote-diode temperature max6698 toc03 remote-diode temperature ( c) temperature error ( c) -4 -3 -2 -1 0 1 2 3 4 0 25 50 75 100 125 local temperature error vs. die temperature max6698 toc04 die temperature ( c) temperature error ( c) remote-diode temperature error vs. power-supply noise frequency max6698 toc05 frequency (mhz) temperature error ( c) -4 -3 -2 -1 0 1 2 3 4 5 -5 0.1 1 100mv p-p local temperature error vs. power-supply noise frequency max6698 toc06 frequency (mhz) temperature error ( c) 0.1 0.01 -4 -3 -2 -1 0 1 2 3 4 5 -5 0.001 1 100mv p-p remote temperature error vs. common-mode noise frequency max6698 toc07 frequency (mhz) temperature error ( c) 1 0.1 0.01 -4 -3 -2 -1 0 1 2 3 4 5 -5 0.001 10 100mv p-p remote temperature error vs. common-mode noise frequency max6698 toc08 frequency (mhz) temperature error ( c) 1 0.1 0.01 -4 -3 -2 -1 0 1 2 3 4 5 -5 0.001 10 100mv p-p downloaded from: http:///
max6698 _______________________________________________________________________________________ 5 temperature error vs. dxp-dxn capacitance max6698 toc09 dxp-dxn capacitance (nf) temperature error ( c) 10 -4.5 -4.0 -3.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 -5.0 1 100 max6698 7-channel precision remote-diode, thermistor, and local temperature monitor typical operating characteristics (continued) (v cc = 3.3v, t a = +25?, unless otherwise noted.) 0 10 5 2015 25 30 05 0 25 75 100 125 alert, overt sink current vs. temperature max6698 toc10 temperature ( c) alert sink current (ma) v ol = 0.3v v ol = 0.1v thermistor adc error vs. power-supply noise frequency max6698 toc11 frequency (mhz) temperature error ( c) 10 1 0.1 -4 -3 -2 -1 0 1 2 3 4 5 -5 0.01 100 100mv p-p pin description pin name function 1 dxp1 combined current source and a/d positive input for channel 1 remote diode. connect to the anodeof a remote-diode-connected temperature-sensing transistor. leave floating or connect to v cc if no remote diode is used. place a 2200pf capacitor between dxp1 and dxn1 for noise filtering. 2 dxn1 cathode input for channel 1 remote diode. connect the cathode of the channel 1 remote-diode-connected transistor to dxn1. 3 dxp2 combined current source and a/d positive input for channel 2 remote diode. connect to the anodeof a remote-diode-connected temperature-sensing transistor. leave floating or connect to v cc if no remote diode is used. place a 2200pf capacitor between dxp2 and dxn2 for noise filtering. 4 dxn2 cathode input for channel 2 remote diode. connect the cathode of the channel 2 remote-diode-connected transistor to dxn2. 5 dxp3 combined current source and a/d positive input for channel 3 remote diode. connect to the anodeof a remote-diode-connected temperature-sensing transistor. leave floating or connect to v cc if no remote diode is used. place a 2200pf capacitor between dxp3 and dxn3 for noise filtering. 6 dxn3 cathode input for channel 3 remote diode. connect the cathode of the channel 1 remote-diode-connected transistor to dxn3. 7 ther3 thermistor voltage sense input 3. connect thermistor 3 between ther3 and ground and an externalresistor r ext3 between ther3 and vref. 8 vref thermistor reference voltage (1v nominal). vref is automatically enabled for a thermistorconversion, and is disabled for diode measurements. downloaded from: http:///
max6698 detailed description the max6698 is a precision multichannel temperaturemonitor that features one local, three remote thermal diode temperature-sensing channels, and three ther- mistor voltage-sensing channels. all channels have a programmable alert threshold for each temperature channel and a programmable overtemperature thresh- old for channels 1, 4, 5, and 6 (see figure 1). communication with the max6698 is achieved through the smbus serial interface and a dedicated alert ( alert) pin. the alarm outputs, overt and alert , assert if the software-programmed temperature thresh-olds are exceeded. alert typically serves as an inter- rupt, while overt can be connected to a fan, system shutdown, or other thermal-management circuitry.note that thermistor ?emperature data?is really the volt- age across the fixed resistor, r ext , in series with the thermistor. this voltage is directly related to temperature,but the data is expressed in percentage of the reference voltage not in ?. adc conversion sequence in the default conversion mode, the max6698 starts theconversion sequence by measuring the temperature on the channel 1 remote diode, followed by the channel 2, remote diode, channel 3 remote diode, and the local channel. then it measures thermistor channel 1, ther- mistor channel 2, and thermistor channel 3. the con- version result for each active channel is stored in thecorresponding temperature data register. in some systems, one of the remote thermal diodes may be monitoring a location that experiences temperature changes that occur much more rapidly than in the other channels. if faster temperature changes must be moni- tored in one of the temperature channels, the max6698 allows channel 1 to be monitored at a faster rate than the other channels. in this mode (set by writing a 1 to bit 4 of the configuration 1 register), measurements of channel 1 alternate with measurements of the other channels. the sequence becomes remote-diode channel 1, remote- diode channel 2, remote-diode channel 1, remote-diode channel 3, remote-diode channel 1, etc. note that the time required to measure all seven channels is consider- ably greater in this mode than in the default mode. low-power standby mode standby mode reduces the supply current to less than15? by disabling the internal adc. enter standby by setting the stop bit to 1 in the configuration 1 register. during standby, data is retained in memory, and the smbus interface is active and listening for smbus com- mands. the timeout is enabled if a start condition is rec- ognized on the smbus. activity on the smbus causes the supply current to increase. if a standby command is received while a conversion is in progress, the conver- sion cycle is interrupted, and the temperature registers are not updated. the previous data is not changed and remains available. 7-channel precision remote-diode, thermistor, and local temperature monitor 6 _______________________________________________________________________________________ pin description (continued) pin name function 9 ther2 thermistor voltage sense input 2. connect thermistor 2 between ther2 and ground and an externalresistor r ext3 between ther2 and vref. 10 ther1 thermistor voltage sense input 1. connect thermistor 1 between ther1 and ground and an externalresistor r ext3 between ther1 and vref. 11 overt overtemperature active-low, open-drain output. overt asserts low when the temperature of channels 1, 4, 5, and 6 exceed the programmed threshold limit. 12 v cc supply voltage input. bypass to gnd with a 0.1? capacitor. 13 alert smbus alert (interrupt), active-low, open-drain output. alert asserts low when the temperature of channels 1, 4, 5, and 6 exceed programmed threshold limit. 14 smbdata smbus serial-data input/output. connect to a pullup resistor. 15 smbclk smbus serial-clock input. connect to a pullup resistor. 16 gnd ground downloaded from: http:///
smbus digital interface from a software perspective, the max6698 appears asa series of 8-bit registers that contain temperature mea- surement data, alarm threshold values, and control bits. a standard smbus-compatible 2-wire serial interface is used to read temperature data and write control bits and alarm threshold data. the same smbus slave address also provides access to all functions. the max6698 employs four standard smbus protocols: write byte, read byte, send byte, and receive byte (figure 2). the shorter receive byte protocol allows quicker transfers, provided that the correct data regis- ter was previously selected by a read byte instruction.use caution with the shorter protocols in multimaster systems, since a second master could overwrite the command byte without informing the first master. figure 3 is the smbus write timing diagram and figure 4 is the smbus read timing diagram. the remote diode 1 measurement channel provides 11 bits of data (1 lsb = 0.125?). all other temperature- measurement channels provide 8 bits of temperature data (1 lsb = 1?). the 8 most significant bits (msbs) can be read from the local temperature, remote tem- perature, and thermistor registers. the remaining 3 bits max6698 _______________________________________________________________________________________ 7 dxp1 dxn1 3-to-1 mux input buffer adc 10/100 a v cc cnt counter vref command byte remote temperatures local temperatures register bank alert threshold overt threshold alert response address alu dp vref1 smbus interface max6698 scl sda overt alert dxp3 dxn3 buf1 buf2 3-to-1 mux r ext1 r ther1 r ext2 r ther1 r ext1 r ther1 figure 1. internal block diagram 7-channel precision remote-diode, thermistor, and local temperature monitor downloaded from: http:///
max6698 for remote diode 1 can be read from the extended tem- perature register. if extended resolution is desired, the extended resolution register should be read first. this prevents the most significant bits from being overwritten by new conversion results until they have been read. if the most significant bits have not been read within an smbus timeout period (nominally 25ms), normal updat- ing continues. table 1 shows themistor voltage data for- mat. table 2 shows the main temperature register (high byte) data format. table 3 shows the extended resolu- tion temperature register (low byte) data format. diode fault detection if a channel? input dxp_ and dxn_ are left open, themax6698 detects a diode fault. an open diode fault does not cause either alert or overt to assert. a bit in the status register for the corresponding channel isset to 1 and the temperature data for the channel is stored as all 1s (ffh). it takes approximately 4ms for the max6698 to detect a diode fault. once a diode fault is detected, the max6698 goes to the next channel in the conversion sequence. depending on operating conditions, a shorted diode may or may not cause alert or overt to assert, so if a channel will not be used, disconnect its dxp and dxn inputs. alarm threshold registers there are 11 alarm threshold registers that store over-temperature alert and overt threshold values. seven of these registers are dedicated to store onelocal alert temperature threshold limit, three remote alert temperature threshold limits, and three thermistor volt- age threshold limits (see the alert interrupt mode sec- tion). the remaining four registers are dedicated toremote-diode channel 1, and three thermistor channels 1, 2, and 3 to store overtemperature threshold limits (see the overt overtemperature alarm section). access to these registers is provided through the smbus interface. 7-channel precision remote-diode, thermistor, and local temperature monitor 8 _______________________________________________________________________________________ figure 2. smbus protocols write byte format read byte format send byte format receive byte format slave address: equiva-lent to chip-select line of a 3-wire interface command byte: selects whichregister you are writing to data byte: data goes into the registerset by the command byte (to set thresholds, configuration masks, and sampling rate) slave address: equiva- lent to chip-select line command byte: selectswhich register you are reading from slave address: repeateddue to change in data- flow direction data byte: reads fromthe register set by the command byte command byte: sends com-mand with no data, usually used for one-shot command data byte: reads data fromthe register commanded by the last read byte or write byte transmission; also used for smbus alert response return address s = start condition shaded = slave transmission p = stop condition /// = not acknowledged s address rd ack data /// p 7 bits 8 bits wr s ack command ack p 8 bits address 7 bits p 1 ack data 8 bits ack command 8 bits ack wr address 7 bits s s address wr ack command ack s address 7 bits 8 bits 7 bits rd ack data 8 bits /// p v rext digital output 1.000 1100 1000 0.500 0110 0100 0.250 0011 0010 0.055 0000 1011 0.050 0000 1010 0.005 0000 0001 0.000 0000 0000 table 1. thermistor voltage data format downloaded from: http:///
max6698 _______________________________________________________________________________________ 9 7-channel precision remote-diode, thermistor, and local temperature monitor smbclk a = start conditionb = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave ab cd e fg hi j smbdata t su:sta t hd:sta t low t high t su:dat t su:sto t buf lm k e = slave pulls smbdata line lowf = acknowledge bit clocked into master g = msb of data clocked into slave h = lsb of data clocked into slave i = master pulls data line lowj = acknowledge clocked into slave k = acknowledge clock pulse l = stop condition m = new start condition figure 3. smbus write timing diagram smbclk ab cd e fg h i j k smbdata t su:sta t hd:sta t low t high t su:dat t hd:dat t su:sto t buf a = start conditionb = msb of address clocked into slave c = lsb of address clocked into slave d = r/w bit clocked into slave e = slave pulls smbdata line low l m f = acknowledge bit clocked into masterg = msb of data clocked into master h = lsb of data clocked into master i = master pulls data line low j = acknowledge clocked into slavek = acknowledge clock pulse l = stop condition m = new start condition figure 4. smbus read timing diagram temp ( c) digital output > 127 0111 1111 127 0111 1111 126 0111 1110 25 00011001 0.00 0000 0000 < 0.00 0000 0000 diode fault (open) 1111 1111 diode fault (short) 1111 1111 or 1110 1110 table 2. main temperature register (highbyte) data format temp ( c) digital output 0 000x xxxx +0.125 001x xxxx +0.250 010x xxxx +0.375 011x xxxx +0.500 100x xxxx +0.625 101x xxxx +0.725 110x xxxx +0.875 111x xxxx table 3. extended resolutiontemperature register (low byte) data format downloaded from: http:///
max6698 alert interrupt mode an alert interrupt occurs when the internal or external temperature reading exceeds a high-temperature limit(user programmable). the alert interrupt output sig- nal can be cleared by reading the status register(s)associated with the fault(s) or by successfully respond- ing to an alert response address transmission by the master. in both cases, the alert is cleared but is reasserted at the end of the next conversion if the fault condition still exists. the interrupt does not halt auto- matic conversions. the alert output is open drain so that multiple devices can share a common interruptline. all alert interrupts can be masked using the configuration 3 register. the por state of these regis- ters is shown in table 4. alert response address the smbus alert response interrupt pointer providesquick fault identification for simple slave devices that lack the complex logic needed to be a bus master. upon receiving an interrupt signal, the host master can broadcast a receive byte transmission to the alert response slave address (see the slave addresses sec- tion). then, any slave device that generated an inter- rupt attempts to identify itself by putting its own address on the bus. the alert response can activate several different slave devices simultaneously, similar to the i 2 c general call. if more than one slave attempts to respond, bus arbitra-tion rules apply, and the device with the lower address code wins. the losing device does not generate an acknowledgment and continues to hold the alert line low until cleared. (the conditions for clearing an alertvary depending on the type of slave device.) successful completion of the alert response protocol clears the output latch. if the condition that caused the alert still exists, the max6698 reasserts the alert interrupt at the end of the next conversion. overt overtemperature alarms the max6698 has four overtemperature registers thatstore remote alarm threshold data for the overt out- put. overt is asserted when a channel? measured temperature (voltage in the case of the thermistor chan-nels) is greater than the value stored in the correspond- ing threshold register. overt remains asserted until the temperature drops below the programmed thresh-old minus 4? hysteresis for remote-diode channel 1, or 4 lsb hysteresis for thermistor channels 1, 2, and 3. anovertemperature output can be used to activate a cool- ing fan, send a warning, initiate clock throttling, or trig- ger a system shutdown to prevent component damage. see table 4 for the por state of the overtemperature threshold registers. command byte functions the 8-bit command byte register (table 4) is the masterindex that points to the various other registers within the max6698. this register? por state is 0000 0000. configuration bytes functions there are three read-write configuration registers(tables 5, 6, 7) that can be used to control the max6698? operation. configuration 1 register the configuration 1 register (table 5) has several func- tions. bit 7(msb) is used to put the max6698 either in software standby mode (stop) or continuous conver- sion mode. bit 6 resets all registers to their power-on reset conditions and then clears itself. bit 5 disables the smbus timeout. bit 4 enables more frequent con- versions on channel 1, as described in the adc conversion sequence section. bit 3 enables resistance cancellation on channel 1. see the series resistance cancellation section for more details. the remaining bits of the configuration 1 register are not used. thepor state of this register is 0000 0000 (00h). configuration 2 register the configuration 2 register functions are described intable 6. bits [6:0] are used to mask the alert interrupt output. bit 6 masks the local alert interrupt, bits 5through 3 mask the remote-diode alert interrupts, and bits 2 through 0 mask the thermistor alert interrupts. thepower-up state of this register is 0000 0000 (00h). configuration 3 register table 7 describes the configuration 3 register. bits 5, 4, 3, and 0 mask the overt interrupt output for thermistor channels 1, 2, and 3 and remote-diode channel 1. theremaining bits, 7, 6, 2, and 1, are reserved. the power- up state of this register is 0000 0000 (00h). 7-channel precision remote-diode, thermistor, and local temperature monitor 10 ______________________________________________________________________________________ downloaded from: http:///
max6698 ______________________________________________________________________________________ 11 7-channel precision remote-diode, thermistor, and local temperature monitor register address (hex) por state (hex) read/ write description local 07 00 r read local temperature register remote 1 01 00 r read channel 1 remote temperature register remote 2 02 00 r read channel 2 remote temperature register remote 3 03 00 r read channel 3 remote temperature register thermistor 1 04 00 r read thermistor 1 voltage register thermistor 2 05 00 r read thermistor 2 voltage register thermistor 3 06 00 r read thermistor 3 voltage register configuration 1 41 00 r/w read/write configuration register 1 configuration 2 42 00 r/w read/write configuration register 2 configuration 3 43 00 r/w read/write configuration register 3 status 1 44 00 r read status register 1 status 2 45 00 r read status register 2 status 3 46 00 r read status register 3 local alert high limit 17 5a r/w read/write local alert high-temperature threshold limit register remote 1 alert high limit 11 6e r/w read/write channel 1 remote-diode alert high-temperaturethreshold limit register remote 2 alert high limit 12 7f r/w read/write channel 2 remote-diode alert high-temperaturethreshold limit register remote 3 alert high limit 13 64 r/w read/write channel 3 remote-diode alert high-temperaturethreshold limit register thermistor 1 alert high limit 14 64 r/w read/write thermistor 1 voltage alert high-threshold limitregister thermistor 2 alert high limit 15 64 r/w read/write thermistor 2 alert high-threshold limit register thermistor 3 alert high limit 16 64 r/w read/write thermistor 3 alert high-threshold limit register remote 1 overt high limit 21 6e r/w read/write channel 1 remote-diode overtemperature threshold limit register thermistor 1 overt high limit 24 7f r/w read/ write thermistor 1 overtemperature threshold limit register thermistor 2 overt high limit 25 5a r/w read/write thermistor 2 overtemperature threshold limit register thermistor 3 overt high limit 26 5a r/w read/write thermistor3 overtemperature threshold limit register remote 1 extendedtemperature 09 00 r read channel 1 remote-diode extended temperature register manufacturer id 0a 4d r read manufacturer id device id and revision 0e 00 table 4. command byte register bit assignment downloaded from: http:///
max6698 status registers functions status registers 1, 2, and 3 (tables 8, 9, 10) indicatewhich (if any) temperature thresholds have been exceeded and if there is an open-circuit or short-circuit fault detected with the external sense junctions. status register 1 indicates if the measured temperature has exceeded the threshold limit set in the alert registers for the local or remote-sensing diodes. status register 2indicates if the measured temperature has exceeded the threshold limit set in the overt registers. status register 3 indicates if there is a diode fault (open orshort) in any of the remote-sensing channels. bits in the alert status register clear by a successfulread, but set again after the next conversion unless the fault is corrected, either by a drop in the measured tem- perature or an increase in the threshold temperature. the alert interrupt output follows the status flag bit. once the alert output is asserted, it can be deassert- ed by either reading status register 1 or by successfullyresponding to an alert response address. in both cases, the alert is cleared even if the fault condition exists, but the alert output reasserts at the end of the next con- version. reading the status 2 register does not clear theovert interrupt output. to eliminate the fault condition, 7-channel precision remote-diode, thermistor, and local temperature monitor 12 ______________________________________________________________________________________ bit name por state function 7(msb) stop 0 standby mode control bit. if stop is set to logic 1, the max6698 stopsconverting and enters standby mode. 6p o r0 reset bit. set to logic 1 to put the device into its power-on state. this bit is self-clearing. 5 timeout 0 timeout enable bit. set to logic 0 to enable smbus timeout. 4 fast remote 1 0 channel 1 fast conversion bit. set to logic 1 to enable fast conversion ofchannel 1. 3 resistance cancellation 0 resistance cancellation bit. when set to logic 1, the max6698 cancels seriesresistance in the channel 1 thermal diode. 2 reserved 0 1 reserved 0 0 reserved 0 table 5. configuration 1 register bit name por state function 7(msb) reserved 0 6 mask local alert 0 local alert mask. set to logic 1 to mask local channel alert . 5 mask thermistor 3alert 0 thermistor 3 alert mask. set to logic 1 to mask thermistor 3 alert . 4 mask thermistor 2alert 0 thermistor 2 alert mask. set to logic 1 to mask thermistor 2 alert . 3 mask thermistor 1alert 0 thermistor 1 alert mask. set to logic 1 to mask thermistor 1 alert . 2 mask remote-diode 3alert 0 remote-diode 3 alert interrupt mask. set to logic 1 to mask remotediode 3 alert . 1 mask remote-diode 2alert 0 remote-diode 2 alert interrupt mask. set to logic 1 to mask remotediode 2 alert . 0 mask remote-diode 2alert 0 remote-diode 1 alert interrupt mask. set to logic 1 to mask remotediode 1 alert . table 6. configuration 2 register downloaded from: http:///
either the measured value must drop below the thresh- old minus the hysteresis value (4? or 4 lsbs), or the trip threshold must be set at least 4c (or 4 lsbs) above the current value. applications information remote-diode selection the max6698 directly measures the die temperature ofcpus and other ics that have on-chip temperature- sensing diodes (see the typical application circuit ) or it can measure the temperature of a discrete diode-connected transistor. effect of ideality factor the accuracy of the remote temperature measurementsdepends on the ideality factor (n) of the remote ?iode (actually a transistor). the max6698 is optimized for n = 1.008. a thermal diode on the substrate of an ic is normally a pnp with the base and emitter brought out the collector (diode connection) grounded. dxp_ must be connected to the anode (emitter) and dxn_ must be connected to the cathode (base) of this pnp. if a sense transistor with an ideality factor other than 1.008 is used, the output data is different from the data obtained with the optimum ideality factor. fortunately, the difference is predictable. assume a remote-diode sensor designed for a nominal ideality factor n nominal is used to measure the temperature of a diode with a different ideality factor n1. the measured temperaturet m can be corrected using: where temperature is measured in kelvin andn nomimal for the max6698 is 1.008. as an example, assume you want to use the max6698 with a cpu thathas an ideality factor of 1.002. if the diode has no series resistance, the measured data is related to the real temperature as follows: for a real temperature of +85? (358.15k), the mea- sured temperature is +82.87? (356.02k), an error of -2.13?. series resistance cancellation some thermal diodes on high-power ics can haveexcessive series resistance, which can cause tempera- ture measurement errors with conventional remote tem- perature sensors. channel 1 of the max6698 has a series resistance cancellation feature (enabled by bit 3 of the configuration 1 register) that eliminates the effect of diode series resistance. set bit 3 to 1 if the series resistance is large enough to affect the accuracy of tt n n tt actual m nominal mm = ? ? ? ? ? ? = ? ? ? ? ? ? = 1 1 008 1 002 1 00599 .. (. ) tt n n m actual nominal = ? ? ? ? ? ? 1 max6698 ______________________________________________________________________________________ 13 7-channel precision remote-diode, thermistor, and local temperature monitor bit name por state function 7(msb) reserved 0 6 reserved 0 5 mask thermistor 3 overt 0 thermistor 3 overt mask bit. set to logic 1 to mask thermistor 3 overt . 4 mask thermistor 2 overt 0 thermistor 2 overt mask bit. set to logic 1 to mask thermistor 2 overt . 3 mask thermistor 1 overt 0 thermistor 1 overt mask bit. set to logic 1 to mask thermistor 1 overt . 2 reserved 0 1 reserved 0 0 mask overt 10 channel 1 remote-diode overt mask bit. set to logic 1 to mask channel 1 overt . table 7. configuration 3 register downloaded from: http:///
max6698 channel 1. the series resistance cancellation functionincreases the conversion time for channel 1 by 125ms. this feature cancels the bulk resistance of the sensor and any other resistance in series (wire, contact resis- tance, etc.). the cancellation range is from 0 to 100 ? . discrete remote diodes when the remote-sensing diode is a discrete transistor,its collector and base must be connected together. table 11 lists examples of discrete transistors that are appropri- ate for use with the max6698. the transistor must be a small-signal type with a relatively high forward voltage; otherwise, the a/d input voltage range can be violated. the forward voltage at the highest expected temperature must be greater than 0.25v at 10?, and at the lowest expected temperature, the forward voltage must be less than 0.95v at 100?. large power transistors must not be used. also, ensure that the base resistance is less than 10 ? . tight specifications for forward current gain (50 < <150, for example) indicate that the manufacturer has good process controls and that the devices have consis- tent v be characteristics. manufacturers of discrete tran- sistors do not normally specify or guarantee idealityfactor. this is normally not a problem since good-quality discrete transistors tend to have ideality factors that fall within a relatively narrow range. we have observed varia- tions in remote temperature readings of less than ?? with a variety of discrete transistors. still, it is good design practice to verify good consistency of temperature read- ings with several discrete transistors from any manufac- turer under consideration. unused diode channels if one or more of the remote diode channels is not need- ed, the dxp and dxn inputs for that channel should either be unconnected, or the dxp input should be con- nected to v cc . the status register indicates a diode "fault" for this channel and the channel is ignored duringthe temperature-measurement sequence. it is also good practice to mask any unused channels immediately upon power-up by setting the appropriate bits in the configuration 2 and configuration 3 registers. this will prevent unused channels from causing alert# or overt# to assert. thermistor measurements the max6698 can use three external thermistors tomeasure temperature. a thermistor? resistance varies as a function of temperature. a negative temperature coefficient (ntc) thermistor can be connected between the thermistor input and ground, with a series resistor, rext_, connected from the thermistor input to vref. 7-channel precision remote-diode, thermistor, and local temperature monitor 14 ______________________________________________________________________________________ bit name por state function 7(msb) reserved 0 6 local alert 0 local channel high-alert bit. this bit is set to logic 1 when the local temperature exceeds the temperature threshold limit in the local alert high-limit register. 5 thermistor 3 alert 0 thermistor 3 alert bit. this bit is set to logic 1 when the thermistor 3 voltage exceeds the threshold limit in the thermistor 3 alert high-limit register. 4 thermistor 2 alert 0 thermistor 2 alert bit. this bit is set to logic 1 when the thermistor 2 voltage exceeds the threshold limit in the thermistor 2 alert high-limit register. 3 thermistor 1 alert 0 thermistor 1 alert bit. this bit is set to logic 1 when the thermistor 1 voltage exceeds the threshold limit in the thermistor 1 alert high-limit register. 2 remote-diode 3 alert 0 channel 3 remote-diode high-alert bit. this bit is set to logic 1 when thechannel 3 remote-diode temperature exceeds the programmed temperature threshold limit in the remote 3 alert high-limit register. 1 remote-diode 2 alert 0 channel 2 remote-diode high-alert bit. this bit is set to logic 1 when thechannel 2 remote-diode temperature exceeds the temperature threshold limit in the remote 2 alert high-limit register. 0 remote-diode 1 alert 0 channel 1 remote-diode high-alert bit. this bit is set to logic 1 when thechannel 1 remote-diode temperature exceeds the temperature threshold limit in the remote 1 alert high-limit register. table 8. status 1 register downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ______________________________________________________________________________________ 15 bit name por state function 7(msb) reserved 0 6 reserved 0 5 thermistor 3 overt 0 thermistor 3 overtemperature status bit. this bit is set to logic 1 when thethermistor 3 voltage exceeds the threshold limit in the thermistor 3 overt high-limit register. 4 thermistor 2 overt 0 thermistor 2 overtemperature status bit. this bit is set to logic 1 when thethermistor 2 voltage exceeds the threshold limit in the thermistor 2 overt high-limit register. 3 thermistor 1 overt 0 thermistor 1 overtemperature status bit. this bit is set to logic 1 when thethermistor 1 voltage exceeds the threshold limit in the thermistor 1 overt high-limit register. 2 reserved 0 1 reserved 0 0 remote 1 overt 0 channel 1 remote-diode overtemperature status bit. this bit is set to logic 1when the channel 1 remote-diode temperature exceeds the temperature threshold limit in the remote 1 overt high-limit register. table 9. status 2 register bit name por state function 7(msb) reserved 0 6 reserved 0 5 reserved 0 4 reserved 0 3 diode fault 3 0 channel 3 remote-diode fault bit. this bit is set to 1 when dxp3 and dxn3are open circuit or when dxp3 is connected to v cc . 2 diode fault 2 0 channel 2 remote-diode fault bit. this bit is set to 1 when dxp2 and dxn2are open circuit or when dxp2 is connected to v cc . 1 diode fault 1 0 channel 1 remote-diode fault bit. this bit is set to 1 when dxp1 and dxn1are open circuit or when dxp1 is connected to v cc . 0 reserved 0 table 10. status 3 register downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 16 ______________________________________________________________________________________ vref supplies a reference voltage (1v nominal) to biasthe thermistor/rext_ voltage-divider. the voltage across rext is measured by the max6698? adc, resulting in a voltage that is directly proportional to tem- perature. the data in the thermistor registers gives the voltage across rext as a fraction of the reference volt- age (1lsb = 0.5% of vref). because thermistors have nonlinear temperature-resis- tance functions, and because different thermistors have different functions, it is important to understand the relationship between temperature, rext, and the volt- age across rext for a given thermistor. table 13 shows temperature vs. the thermistor channel data for a betatherm 10k3a1 thermistor and rext=1600 ? . thermal mass and self-heating when sensing local temperature, the max6698 mea- sures the temperature of the printed-circuit board (pcb) to which it is soldered. the leads provide a good thermal path between the pcb traces and the die. as with all ic temperature sensors, thermal conductivitybetween the die and the ambient air is poor by compar- ison, making air temperature measurements impracti- cal. because the thermal mass of the pcb is far greater than that of the max6698, the device follows tempera- ture changes on the pcb with little or no perceivable delay. when measuring the temperature of a cpu or other ic with an on-chip sense junction, thermal mass has virtually no effect; the measured temperature of the junction tracks the actual temperature within a conver- sion cycle. when measuring temperature with discrete remote tran- sistors, the best thermal response times are obtained with transistors in small packages (i.e., sot23 or sc70). take care to account for thermal gradients between the heat source and the sensor, and ensure that stray air currents across the sensor package do not interfere with measurement accuracy. self-heating does not significantly affect measurement accuracy. remote-sensor self-heating due to the diode current source is negligible. adc noise filtering the integrating adc has good noise rejection for low-frequency signals such as power-supply hum. in envi- ronments with significant high-frequency emi, connect an external 2200pf capacitor between dxp_ and dxn_. larger capacitor values can be used for added filtering, but do not exceed 3300pf because it can introduce errors due to the rise time of the switched current source. high-frequency noise reduction is needed for high-accuracy remote measurements. noise can be reduced with careful pcb layout as dis- cussed in the pcb layout section. pcb layout follow these guidelines to reduce the measurementerror when measuring remote temperature: 1) place the max6698 as close as is practical to the remote diode. in noisy environments, such as acomputer motherboard, this distance can be 4in to 8in (typ). this length can be increased if the worst noise sources are avoided. noise sources include crts, clock generators, memory buses, and pci buses. 2) do not route the dxp-dxn lines next to the deflec- tion coils of a crt. also, do not route the traces across fast digital signals, which can easily intro- duce +30? error, even with good filtering. manufacturer model no. central semiconductor (usa) cmpt3904 rohm semiconductor (usa) sst3904 samsung (korea) kst3904-tf siemens (germany) smbt3904 zetex (england) fmmt3904ct-nd table 11. remote-sensors transistormanufacturers note: discrete transistors must be diode connected (base shorted to collector). part smbus slave id pin-package max6698 ee34 0011 010 16 qsop max6698ee38 0011 100 16 qsop max6698ee99 1001 100 16 qsop max6698ee9c 1001 110 16 qsop max6698ue34 0011 010 16 tssop MAX6698UE38 0011 100 16 tssop max6698ue99 1001 100 16 tssop max6698ue9c 1001 110 16 tssop table 12. slave address table 12 lists the max6698 slave addresses. slave addresses downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ______________________________________________________________________________________ 17 3) route the dxp and dxn traces in parallel and in close proximity to each other. each parallel pair oftraces should go to a remote diode. route these traces away from any higher voltage traces, such as +12vdc. leakage currents from pcb contamination must be dealt with carefully since a 20m ? leakage path from dxp to ground causes about +1? error. ifhigh-voltage traces are unavoidable, connect guard traces to gnd on either side of the dxp-dxn traces (figure 5). 4) route through as few vias and crossunders as pos- sible to minimize copper/solder thermocoupleeffects. 5) use wide traces when practical. 6) when the power supply is noisy, add a resistor (up to 47 ? ) in series with v cc . twisted-pair and shielded cables use a twisted-pair cable to connect the remote sensorfor remote-sensor distances longer than 8in or in very noisy environments. twisted-pair cable lengths can be between 6ft and 12ft before noise introduces excessive errors. for longer distances, the best solution is a shielded twisted pair like that used for audio micro- phones. for example, belden #8451 works well for dis- tances up to 100ft in a noisy environment. at thedevice, connect the twisted pair to dxp and dxn and the shield to gnd. leave the shield unconnected at the remote sensor. for very long cable runs, the cable? parasitic capacitance often provides noise filtering, so the 2200pf capacitor can often be removed or reduced in value. cable resistance also affects remote-sensor accuracy. for every 1 ? of series resistance the error is approximately +1/2?. 10 mils 10 mils 10 milsminimum 10 mils gnd dxp dxn gnd figure 5. recommended dxp-dxn pcb traces downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 18 ______________________________________________________________________________________ table 13. temperature vs. thermistor channel data for a betatherm 103a1 thermistorand r ext = 1600 ? t ( o c) r therm v rext code (decimal) binary code hex code -20 96974 0.016231 3 11000000 3 -19 91525 0.017181 3 11000000 3 -18 86415 0.018179 4 10000000 4 -17 81621 0.019226 4 10000000 4 -16 77121 0.020325 4 10000000 4 -15 72895 0.021478 4 10000000 4 -14 68927 0.022686 5 10100000 5 -13 65198 0.023953 5 10100000 5 -12 61693 0.025279 5 10100000 5 -11 58397 0.026668 5 10100000 5 -10 55298 0.02812 6 11000000 6 -9 52380 0.029641 6 11000000 6 -8 49633 0.03123 6 11000000 6 -7 47047 0.03289 7 11100000 7 -6 44610 0.034625 7 11100000 7 -5 42314.6 0.036434 7 11100000 7 -4 40149.5 0.038324 8 10000000 8 -3 38108.5 0.040294 8 10000000 8 -2 36182.8 0.042347 8 10000000 8 -1 34366.1 0.044486 9 10010000 9 0 32650.8 0.046714 9 10010000 9 1 31030.4 0.049034 10 10100000 a 2 29500.1 0.051447 10 10100000 a 3 28054.2 0.053955 11 10110000 b 4 26687.6 0.056562 11 10110000 b 5 25395.5 0.059269 12 11000000 c 6 24172.7 0.062081 12 11000000 c 7 23016 0.064998 13 11010000 d 8 21921.7 0.068022 14 11100000 e 9 20885.2 0.071158 14 11100000 e 10 19903.5 0.074406 15 11110000 f 11 18973.6 0.07777 16 10000000 10 12 18092.6 0.081249 16 10000000 10 13 17257.4 0.084847 17 10001000 11 14 16465.1 0.088569 18 10010000 12 15 15714 0.092411 18 10010000 12 16 15001.2 0.096379 19 10011000 13 17 14324.6 0.100473 20 10100000 14 18 13682.6 0.104694 21 10101000 15 downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ______________________________________________________________________________________ 19 table 13. temperature vs. thermistor channel data for a betatherm 103a1 thermistorand r ext = 1600 ? (continued) t ( o c) r therm v rext code (decimal) binary code hex code 19 13072.8 0.109045 22 10110000 16 20 12493.7 0.113526 23 10111000 17 21 11943.3 0.11814 24 11000000 18 22 11420 0.122888 25 11001000 19 23 10922.7 0.127768 26 11010000 1a 24 10449.9 0.132781 27 11011000 1b 25 10000 0.137931 28 11100000 1c 26 9572 0.143215 29 11101000 1d 27 9164.7 0.148634 30 11110000 1e 28 8777 0.154187 31 11111000 1f 29 8407.7 0.159877 32 10000000 20 30 8056 0.1657 33 10000100 21 31 7720.9 0.171657 34 10001000 22 32 7401.7 0.177744 36 10010000 24 33 7097.2 0.183967 37 10010100 25 34 6807 0.190318 38 10011000 26 35 6530.1 0.1968 39 10011100 27 36 6266.1 0.203404 41 10100100 29 37 6014.2 0.210134 42 10101000 2a 38 5773.7 0.216987 43 10101100 2b 39 5544.1 0.223961 45 10110100 2d 40 5324.9 0.23105 46 10111000 2e 41 5115.6 0.238251 48 11000000 30 42 4915.5 0.245568 49 11000100 31 43 4724.3 0.252992 51 11001100 33 44 4541.6 0.260518 52 11010000 34 45 4366.9 0.268146 54 11011000 36 46 4199.9 0.275867 55 11011100 37 47 4040.1 0.283683 57 11100100 39 48 3887.2 0.291588 58 11101000 3a 49 3741.1 0.299564 60 11110000 3c 50 3601 0.307633 62 11111000 3e 51 3466.9 0.315775 63 11111100 3f 52 3338.6 0.323978 65 10000010 41 53 3215.6 0.332254 66 10000100 42 54 3097.9 0.340578 68 10001000 44 55 2985.1 0.348956 70 10001100 46 56 2876.9 0.35739 71 10001110 47 57 2773.2 0.365865 73 10010010 49 downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 20 ______________________________________________________________________________________ table 13. temperature vs. thermistor channel data for a betatherm 103a1 thermistorand r ext = 1600 ? (continued) t ( o c) r therm v rext code (decimal) binary code hex code 58 2673.9 0.374365 75 10010110 4b 59 2578.5 0.382913 77 10011010 4d 60 2487.1 0.391476 78 10011100 4e 61 2399.4 0.40006 80 10100000 50 62 2315.2 0.408664 82 10100100 52 63 2234.7 0.417243 83 10100110 53 64 2156.7 0.425906 85 10101010 55 65 2082.3 0.434511 87 10101110 57 66 2010.8 0.443115 89 10110010 59 67 1942.1 0.451709 90 10110100 5a 68 1876 0.460299 92 10111000 5c 69 1812.6 0.468851 94 10111100 5e 70 1751.6 0.477384 95 10111110 5f 71 1693 0.485879 97 11000010 61 72 1636.63 0.494341 99 11000010 63 73 1582.41 0.502764 101 11001010 65 74 1530.28 0.511136 102 11001100 66 75 1480.12 0.51946 104 11010000 68 76 1431.87 0.527727 106 11010100 6a 77 1385.37 0.535947 107 11010110 6b 78 1340.68 0.544092 109 11011010 6d 79 1297.64 0.552173 110 11011100 6e 80 1256.17 0.560191 112 11100000 70 81 1216.23 0.568135 114 11100100 72 82 1177.75 0.576006 115 11100110 73 83 1140.71 0.58379 117 11101010 75 84 1104.99 0.591499 118 11101100 76 85 1070.58 0.599121 120 11110000 78 86 1037.4 0.606658 121 11110010 79 87 1005.4 0.614109 123 11110110 7b 88 974.56 0.621465 124 11111000 7c 89 944.81 0.628731 126 11111100 7e 90 916.11 0.635902 127 11111110 7f 91 888.41 0.642981 129 10000001 81 92 861.7 0.649957 130 10000010 82 downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ______________________________________________________________________________________ 21 table 13. temperature vs. thermistor channel data for a betatherm 103a1 thermistorand r ext = 1600 ? (continued) t ( o c) r therm v rext code (decimal) binary code hex code 93 835.93 0.656833 131 10000011 83 94 811.03 0.663617 133 10000101 85 95 786.99 0.6703 134 10000110 86 96 763.79 0.676879 135 10000111 87 97 741.38 0.683358 137 10001001 89 98 719.74 0.689732 138 10001010 8a 99 698.82 0.696009 139 10001011 8b 100 678.63 0.702176 140 10001100 8c 101 659.1 0.708247 142 10001110 8e 102 640.23 0.714212 143 10001111 8f 103 622 0.720072 144 10010000 90 104 604.36 0.725834 145 10010001 91 105 587.31 0.731492 146 10010010 92 106 570.82 0.737049 147 10010011 93 107 554.86 0.742508 149 10010101 95 108 539.44 0.747859 150 10010110 96 109 524.51 0.753115 151 10010111 97 110 510.06 0.758272 152 10011000 98 111 496.08 0.76333 153 10011001 99 112 482.55 0.768289 154 10011010 9a 113 469.45 0.773152 155 10011011 9b 114 456.76 0.777923 156 10011100 9c 115 444.48 0.782595 157 10011101 9d 116 432.58 0.787177 157 10011101 9d 117 421.06 0.791664 158 10011110 9e 118 409.9 0.79606 159 10011111 9f 119 399.08 0.800368 160 10100000 a0 120 388.59 0.80459 161 10100001 a1 121 378.44 0.808718 162 10100010 a2 122 368.59 0.812764 163 10100011 a3 123 359.05 0.816722 163 10100011 a3 124 349.79 0.820601 164 10100100 a4 125 340.82 0.824394 165 10100101 a5 126 332 0.828157 166 10100110 a6 127 323.5 0.831817 166 10100110 a6 downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor 22 ______________________________________________________________________________________ 1615 14 13 12 11 10 9 12 34 5 6 7 8 dxp1 gndsmbclk smbdata alert v cc overtther1 ther2 top view max6698 qsop dxn1 dxp2 dxn3 dxn2 dxp3 ther3 vref pin configuration chip information process: bicmos downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor ______________________________________________________________________________________ 23 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) qsop.eps f 1 1 21-0055 package outline, qsop .150", .025" lead pitch downloaded from: http:///
max6698 7-channel precision remote-diode, thermistor, and local temperature monitor maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) tssop4.40mm.eps package outline, tssop 4.40mm body 21-0066 1 1 i revision history pages changed at rev 2: 1, 2, 24pages changed at rev 3: 1, 5, 8, 9, 10, 14?7, 24 downloaded from: http:///

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