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general description the max6604 high-precision temperature sensor isdesigned for thermal monitoring functions in ddr memo- ry modules. the device is readable and programmable through the 2-wire smbus/i 2 c-compatible interface. three address inputs set the bus address for the temper-ature sensor to provide up to eight devices on one bus. the internal thermal sensor continuously monitors the temperature and updates the temperature data eight times per second. the master can read the tempera- ture data at any time. since the thermal sensor is locat- ed on the memory module, temperature data recorded accurately represents the temperature of the compo- nents on the module. consequently, the max6604 pro- vides a much more accurate measurement of module temperature than techniques involving temperature sensors on the motherboard. in addition, the device responds more quickly to temperature changes on the module than a motherboard sensor. the max6604 also features an interrupt-output indica- tor for temperature-threshold monitoring. the threshold levels are programmable through the digital interface. the max6604 operates from -20? to +125?, and is available in jedec-standard 8-pin tssop and 8-pin tdfn (2mm x 3mm) packages. applications memory modulesdesktop computers notebook computers workstations networking equipment features ? jedec compliant ? 1c temperature-monitoring accuracy ? overtemperature interrupt with programmable threshold ? +2.7v to +3.6v operating voltage range ? smbus/i 2 c-compatible interface ? 300 a typical operating current ? 3 a typical shutdown current ? -20c to +125c operating temperature range ? 8-pin tssop and 8-pin tdfn (2mm x 3mm) packages max6604 precision temperature monitor for ddr memory modules ___________________________________________________ _____________ maxim integrated products 1 ordering information 19-3837; rev 3; 10/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part serial- clock frequency (kh) pin-package special top mark max6604aata+ 400 8 tdfn-ep* (mo229-wced-2) aar MAX6604AAHA+ 400 8 tssop evaluation kit available typical application circuit appears at end of data sheet. 1 + + 34 86 5 v cc scl sda max6604 max6604 2 7 event a0 a2 gnd ep a1 tdfn tssop top view scl sda gnd 1 2 8 7 v cc event a1 a2 a0 3 4 6 5 pin configurations + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. note: these devices operate over the -20? to +125? operat- ing temperature range. downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v cc = +2.7v to +3.6v, t a = -20? to +125?, unless otherwise noted. typical values are at v cc = +3.3v, t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. all input and output voltages ..................................-0.3v to +6v continuous power dissipation (t a = +70?) 8-pin tdfn (derate 16.7mw/? above +70?) ......1333.3mw 8-pin tssop (derate 8.1mw/? above +70?) ........646.7mw esd protection (all pins, human body model) ....................?kv junction temperature ......................................................+150? operating temperature range .........................-20? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units operating supply voltage range v cc +2.7 +3.6 v 0.125 ? temperature resolution 11 bits +3v v cc +3.6v, +75? t a +95? -1 +1 +3v v cc +3.6v, +40? t a +125? -2 +2 temperature accuracy +3v v cc +3.6v, -20? t a +125? -3 +3 ? power-on reset (por) threshold v cc falling edge 2.0 v por threshold hysteresis 90 mv undervoltage-lockout threshold 2.4 v operating current during conversion 0.3 0.5 ma standby current 36 a conversion time t conv 125 ms conversion rate f conv 8h z digital interface (note 2) log i c- inp ut h i g h v ol tag e ( s c l, s d a) v ih 2.1 v logic-input low voltage (scl, sda) v il 0.8 v logic-input hysteresis (scl, sda) 500 mv leakag e c ur r ent ( e v e n t, s c l, s d a, a2, a1, a0) i leak v in = v gnd or v cc -1 +1 ? logic-output low voltage(sda, event) v ol i pull_up = 350? 50 mv logic-output low sink current(sda, event) i ol v ol = 0.6v 6 ma input capacitance (scl, sda) c in 5p f downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ____________________________________ 3 timing characteristicsmax6604aata+, MAX6604AAHA+ (v cc = +2.7v to +3.6v, t a = -20? to +125?, unless otherwise noted. typical values are at v cc = +3.3v, t a = +25?.) (note 1) parameter symbol conditions min typ max units timing characteristics for fast mode serial-clock frequency f scl 400 khz bus free time between a stop and a start condition t buf 1.3 ? hold time for start condition t hd:sta 0.6 ? low period of the scl clock t low 1.3 ? high period of the scl clock t high 0.6 ? setup time for a repeated startcondition t su:sta 0.6 ? data hold time t hd:dat 0 900 ns data setup time t su:dat 100 ns rise time of both sda and sclsignals, receiving t r measured from 0.3v dd - 0.7v dd 20 + 0.1c b 300 ns fall time of sda transmitting t f measured from 0.3v dd - 0.7v dd 20 + 0.1c b 300 ns setup time for stop condition t su:sto 0.6 ? capacitive load for each bus line c b 400 pf pulse width of spike suppressed t sp 50 ns note 1: all parameters are tested at t a = +25?. specifications over temperature are guaranteed by design. note 2: guaranteed by design. downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules 4 __________________________________________________ _____________________________________ typical operating characteristics (typical values are at v cc = +3.3v, t a = +25?.) 0 21 43 5 6 -50 150 shutdown supply current vs. temperature max6604 toc01 temperature ( c) shutdown supply current ( a) 0 50 100 v cc = 3.6v v cc = 2.7v v cc = 3.3v v cc = 3.0v 340 360320 300 280 260 -50 150 supply current vs. temperature max6604 toc02 temperature ( c) supply current ( a) 0 50 100 v cc = 3.6v v cc = 2.7v v cc = 3.3v v cc = 3.0v -3 -1-2 10 2 3 -50 150 temperature error vs. temperature max6604 toc03 temperature ( c) temperature error ( c) 0 50 100 v cc = 3.0v v cc = 3.3v v cc = 3.6v 2.52.0 1.5 1.0 0.5 0 0.1 100,000 temperature error vs. power supply noise frequency max6604 toc04 power supply noise frequency (khz) temperature error ( c) 10 1,000 square wave appliedto v cc with no bypass capacitor 20mv p-p 200mv p-p pin description pin name function 1 a0 address input. must connect to gnd or v cc to set value. 2 a1 address input. must connect to gnd or v cc to set value. 3 a2 address input. must connect to gnd or v cc to set value. 4 gnd ground 5 sda serial-data input/output. open drain. connect to a pullup resistor. 6 scl serial-clock input. connect to a pullup resistor. 7 event event output. open drain. connect to a pullup resistor. 8v cc supply voltage. connect a 0.1? capacitor to gnd as close as possible to the device. ep exposed pad (tdfn only). internally connected to gnd. connect ep to a large pcb ground plane. downloaded from: http:///
detailed description the max6604 high-precision temperature sensor con-tinuously monitors temperature and updates the temperature data eight times per second. the device functions as a slave on the smbus/i 2 c-compatible inter- face. the master can read the temperature data at anytime through the digital interface. the max6604 also features an open-drain, event-output indicator for tem- perature-threshold monitoring. serial interface smbus/i 2 c the max6604 is readable and programmable throughthe smbus/i 2 c-compatible interface. the device func- tions as a slave on the interface. figure 1 shows thegeneral timing diagram of the clock (scl) and the data (sda) signals for the smbus/i 2 c-compatible interface. the sda and scl bus lines are at logic-high when thebus is not in use. pullup resistors from the bus lines to the supply are required when push-pull circuitry is not driving the lines. the data on the sda line can change only when the scl line is low. start and stop conditions occur when sda changes state while the scl line is high (figure 1). data on sda must be stable for the duration of the setup time (t su:dat ) before scl goes high. data on sda is sampled when scl toggles highwith data on sda is stable for the duration of the hold time (t hd:dat ). note that a segment of data is transmit- ted in an 8-bit byte. a total of nine clock cycles arerequired to transfer a byte to the max6604. since the max6604 employs 16-bit registers, data is transmitted or received in two 8-bit bytes (16 bits). the device acknowledges the successful receipt for each byte by pulling the sda line low (issuing an ack) during the ninth clock cycle of each byte transfer. from a software perspective, the max6604 appears as aset of 16-bit registers that contain temperature data, alarm threshold values, and control bits. a standard smbus/i 2 c-compatible, 2-wire serial interface reads tem- perature data and writes control bits and alarm thresholddata. each device responds to its own smbus/i 2 c slave address, which is selected using a0, a1, and a2. seethe device addressing section for details. the max6604 employs standard i 2 c/smbus protocols using 16-bit registers: write word and read word. writea word of data (16 bits) by first sending max6604? i 2 c address (0011-a2-a1-a0-0), then sending the 8-bitcommand byte, followed by the first 8-bit data byte. note that the slave issues an acknowledge after each byte is written. after the first 8-bit data byte is written, the max6604 also returns an acknowledge. however, the master does not generate a stop condition after the first byte has been written. the master continues to write the second byte of data with the slave acknowl- edging. after the second byte has been written, the master then generates a stop condition. see figure 2. to read a word of data, the master generates a new start condition and sends max6604? i 2 c address with the r/w bit low (0011-a2-a1-a0-0), then sends the 8-bitcommand byte. again, the max6604 issues an ack for each byte received. the master again sends the device address with the r/w bit high (0011-a2-a1-a0-1), fol- lowing an acknowledge. next, the master reads the contents of the selected register, beginning with the most significant bit, and acknowledges if the most sig- nificant data byte is successfully received. finally, the master reads the least significant data byte and issues a nack, followed by a stop condition to terminate the read cycle. max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ____________________________________ 5 start condition repeated start condition stop condition t hd:sta t r t f t low t su:dat t hd:dat t su:sta t hd:sta t su:sto t buf sda scl figure 1. sda and scl timing diagram downloaded from: http:///
max6604 device addressing the temperature sensor is accessed through thesmbus/i 2 c bus using an 8-bit address. the tempera- ture sensor address begins with 0011 and is followedby the logic states of the a2, a1, and a0 inputs. these inputs must be hardwired to either gnd or v cc . the three address inputs set the bus address for the tem-perature sensor to allow up to eight devices on one bus. the 8th bit (r/w) dictates a read or write opera- tion. set the r/w bit low for a write operation and set the r/w bit high for a read operation. see table 1 for a summary of the device address. temperature sensor the thermal sensor continuously monitors the tempera-ture and records the temperature data at least eight times per second. temperature data is latched internal- ly by the max6604 and can be read by software from the bus host at any time. access to the temperature sensor is through the slave id of 0011-a2-a1-a0-0. the i 2 c address-selection inputs (a2, a1, a0) allow up to eight such devices tocoexist on the same bus. consequently, eight memory modules can be supported, given each module has one such slave device address slot. upon application of power, the max6604? configuration registers are set to their default values. table 2 lists the various temperature registers and their default states. note that all registers are 16 bits in length. precision temperature monitor for ddr memory modules 6 __________________________________________________ _____________________________________ write word format read word format slave address: equiv alent to chip-select line of a3-wire interface command byte: selectsto which register you are writing data byte: data goes into the register set by the command byte 8 bits (msb) 8 bits (msb) 8 bits (lsb) slave address: equiva- lent to chip-select line of a 3-wire interface command byte: selects to which register you are writing slave address: repeated due to change in data- flow direction data bytes: reads from the register set by the command byte s = start condition p = stop condition r/w = read/write shaded = slave transmission ack = acknowledge na = not acknowledged ack 7 bits address ack data 8 bits s command p ack 8 bits (lsb) data ack r/w ack 7 bits address ack s ack data ack data address r 8 bits p s command na r/w figure 2. smbus/i 2 c protocols table 2. max6604 registers address por state description 00h 0017h capability register 01h 0000h configuration register 02h 0000h alarm-temperature upper-boundarytrip register 03h 0000h alarm-temperature lower-boundarytrip register 04h 0000h critical-temperature trip register 05h 0000h temperature register 06h 004dh manufacturer? id register 07h 5400h device id/revision register 08h?eh 0000h vendor-defined registers (not used) table 1. max6604 sensor address function address temperature sensor 0 0 1 1 a2a1a0r/w downloaded from: http:///
event-output functionality the event output indicates conditions such as thetemperature crossing a predefined boundary. it oper- ates in one of the three modes: interrupt mode, com- parator mode, and critical-temperature-only mode. figure 3 shows an example of the measured tempera- ture vs. time, with the corresponding behavior of the event output in each of these modes. see the event operation modes section for descriptions of the two modes. the event modes are selected using the con-figuration register. event-output polarity can be set to active high or active low through the configuration register (bit 1). the event output can also be disabled so that event is always high impedance (bit 3). upon device power-up, the default condition for the event output is high impedance. writing a 1 to bit 3 of the configuration reg- ister enables the event output. event thresholds alarm window trip the max6604 provides a comparison window with anupper-temperature trip point and a lower-temperature trip point, programmed through the alarm-upper- boundary register and the alarm-lower-boundary regis- ter, respectively. when enabled, the event output triggers whenever entering or exiting (crossing aboveor below) the alarm window (figure 3). critical trip the critical temperature setting is programmed in thecritical temperature register. when the temperature reaches the critical temperature value in this register (and event is enabled), the event output asserts and cannot be deasserted until the temperature drops below the critical temperature threshold. event operation modes comparator mode in comparator mode, the event output behaves like awindow-comparator output that asserts when the tem- perature is outside the window. reads/writes on the max6604? registers do not affect the event output in comparator mode. the event signal remains asserted until the temperature goes inside the alarm window or the window thresholds are reprogrammed so that the current temperature is within the alarm window. interrupt mode in interrupt mode, event asserts whenever the temper-ature crosses an alarm window threshold. after such an event occurs, writing a 1 to the clear event bit in the con- figuration register deasserts the event output until the next trigger condition occurs. the trip threshold value in max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ____________________________________ 7 s/w clears event event# in critical-temperature-only mode event# in comparator mode event# in interrupt alarm window critical temp time figure 3. event behavior in interrupt, comparator, and critical-temperature-only modes downloaded from: http:///
max6604 the critical temperature register is likely to be higher thanthat of the alarm-upper-boundary register. as a result, when the temperature is above the critical temperature, it is likely that it is above the alarm-upper-boundary as well. in interrupt mode, event asserts when the temper- ature crosses the alarm upper boundary. if the event output is cleared and the temperature continues to increase until it crosses the critical temper- ature threshold, event asserts again. because the temperature is greater than the critical temperature threshold, a clear event command does not clear the event output. once the temperature drops below the critical temperature, event deasserts immediately. if the event output is not cleared before the tempera- ture goes above the critical temperature threshold, event remains asserted. attempting a clear event command has no effect until the temperature drops below the critical temperature, at which point event deasserts immediately because of the earlier clear event command. if no clear event command is attempt- ed, event remains asserted after the temperature drops below the critical temperature. at this point, a clear event command deasserts event. detailed register descriptions capability register (read only) [address = 00h, por = 0017h] this register indicates the capabilities of the thermalsensor, including accuracy, temperature range, and resolution. see table 3 for register details. configuration register (read/write) [address = 01h, por = 0000h] this register controls the various features of eventfunctionality, and controls the bit for thermal-sensor shutdown mode. see table 4 for register details. hysteresis when enabled, hysteresis is applied to temperature varia-tions around trigger points. for example, consider the behavior of the alarm window bit (bit 14 of the tempera- ture register) when the hysteresis is set to 3?. as the temperature rises, bit 14 is set to 1 (temperature is above the alarm window) when the temperature register con- tains a value that is greater than the value in the alarm temperature upper boundary register. if the temperature decreases, bit 14 remains set until the measured temper- ature is less than or equal to the value in the alarm tem- perature upper boundary register minus 3?. precision temperature monitor for ddr memory modules 8 __________________________________________________ _____________________________________ table 3. capability register (read only) bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 rfurfu rfu rfu rfu rfu rfu rfu rfu rfu rfu tres1tres0 wider range higher precision has alarm and critical trips bit definition (descriptions in bold type apply to the max6604) 0 basic capability1: has alarm and critical trips capability 1 accuracy0 = default accuracy ?? over the active and ?? monitor ranges 1 = high accuracy ?? over the active and ?? monitor ranges 2 wider range0 = values lower than 0? are clamped and represented as binary value 0 1 = can read temperature below 0? and set sign bit accordingly 4:3 temperature resolution00 = 0.5? lsb 01 = 0.25? lsb 10 = 0.125? lsb 11 = 0.0625? lsb 15:5 0: reserved for future use (rfu). must be zero. downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ____________________________________ 9 table 4. configuration register (read/write) bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 rfurfu rfu rfu rfu hysteresis shutdown mode critical trip lock bit alarm window lock bit clear event event output status event output control critical event only event polarity event mode bit definition (descriptions in bold type are the default values) 0 event mode 0 = comparator output mode (default) 1 = interrupt mode when either of the lock bits is set, this bit cannot be altered until unlocked. 1 event polarity0 = active low (default) 1 = active high when either of the lock bits is set, this bit cannot be altered until unlocked. 2 critical event only0 = event output on alarm or critical temperature mode (default) 1 = event only if temperature is above the value in the critical temp register when the alarm window lock bit is set, this bit cannot be altered until unlocked. 3 event output control0 = event output disabled (default) [disabled means event remains in an inactive voltage level] 1 = event output enabled when either of the lock bits is set, this bit cannot be altered until unlocked. 4 event output status (read only)0 = event output condition is not being asserted by this device 1 = event output is being asserted by this device due to alarm window or critical trip condition the actual conditions causing an event output can be determined from the temperature register. interrupt mode can be cleared by writing to the clear event bit. writing to this bit has no effect; this bit is not affected by the polarity setting. 5 clear event (write only)0 = no effect 1 = clears active event in interrupt mode. writing to this register has no effect in comparator mode when read, this bit always returns to zero. 6 alarm window lock bit0 = alarm trips are not locked and can be altered (default) 1 = alarm trip register settings cannot be altered this bit is initially cleared. when set, this bit returns a 1 and remains locked until cleared by the internal power-on reset. lock bits and other configuration register bits are updated during the same write; double writes are not necessary. 7 critical trip lock bit0 = critical trip is not locked and can be altered (default) 1 = critical trip register settings cannot be altered this bit is initially cleared. when set, this bit returns a 1 and remains locked until cleared by the internal power-on reset. lock bits and other configuration register bits are updated during the same write; double writes are not necessary. downloaded from: http:///
max6604 similarly, the below alarm window bit (bit 13 of the tem-perature register) is set to 0 (temperature is equal to or above the alarm window lower boundary trip tempera- ture) when the value in the temperature register is equal to or greater than the value in the alarm-temperature lower-boundary register. as the temperature decreas- es, bit 13 is set to 1 when the value in the temperature register is equal to or less than the value in the alarm- temperature lower-boundary register minus 3?. note that hysteresis is also applied to event output functionality. when either of the lock bits is set, the hys- teresis bits cannot be altered. hysteresis is applied toboth alarm window comparisons and critical tempera- ture comparisons. alarm-temperature upper-boundary trip register (read/write) [address = 02h, por = 0000h] the data format for the upper-boundary trip threshold is intwo? complement with one lsb = 0.25?. the alarm- temperature upper-boundary trip register has a -256.00? to +255.75? range. all unused bits are set to zero. precision temperature monitor for ddr memory modules 10 _________________________________________________ _____________________________________ table 4. configuration register (read/write) (continued) bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 rfurfu rfu rfu rfu hysteresis shutdown mode critical trip lock bit alarm window lock bit clear event event output status event output control critical event only event polarity event mode bit definition (descriptions in bold type are the default values) 8 shutdown mode0 = enable temperature monitoring (default) 1 = shutdown temperature monitoring when shutdown occurs, the thermal-sensing device and analog-to-digital converter are disabled to save power; no event output signals are generated. when either of the lock bits is set, this bit cannot be set until unlocked. however, it can be cleared at any time. 10:9 hysteresis enable 00 = disable hysteresis 01 = enable hysteresis at 1.5? 10 = enable hysteresis at 3? 11 = enable hysteresis at 6? 15:11 0: reserved for future use (rfu). must be zero. bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 00 0 sign msb 128? 64?32? 16? 8?4? 2? 1? 0.5? 0.25? 00 table 5. alarm-temperature upper-boundary trip register (read/write) downloaded from: http:///
alarm-temperature lower-boundary trip register (read/write) [address = 03h, por = 0000h] the data format for the lower-boundary trip threshold is intwo? complement with one lsb = 0.25?. the alarm- temperature lower-boundary trip register has a -256.00? to +255.75? range. all unused bits are set to zero. max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ___________________________________ 11 t h - hyst below window bit above window bit t l - hyst t h t l below alarm window bit above alarm window bit function temperature slope threshold temperature temperature slope threshold temperature sets falling t l - hyst rising t h clears rising t l falling t h - hyst figure 4. hysteresis applied to temperature comparisons bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 00 0 sign msb 128? 64?32? 16? 8?4? 2? 1? 0.5? 0.25? 00 table 6. alarm-temperature lower-boundary trip register (read/write) downloaded from: http:///
max6604 critical temperature register (read/write) [address = 04h, por = 0000h] the data format for the critical temperature value is intwo? complement with one lsb = 0.25?. critical tem- perature register has a -256.00? to +255.75? range.all unused bits are set to zero. precision temperature monitor for ddr memory modules 12 _________________________________________________ _____________________________________ table 7. critical temperature register (read/write) temperature register (read only) [address = 05h, por = 0000h] the data format is two? complement with one lsb =0.125?. all unused bits are set to zero. the most sig- nificant bit has a resolution of 128?. the trip status bits represent the internal temperature trip detection, and are not affected by the status of the event or configu-ration bits (e.g., event output control, clear event, etc.). if neither the above alarm window (bit 14) nor the below alarm window (bit 13) are set (i.e., both are 0), the cur- rent temperature is within the alarm window. bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 00 0 sign msb 128? 64?32? 16? 8?4? 2? 1? 0.5? 0.25? 00 table 8. temperature register (read only) bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 above critical trip above alarm window below alarm window sign msb 128? 64?32? 16? 8?4? 2? 1? 0.5? 0.25? 0.125? 0 bit definition 13 below alarm window0 = temperature is equal to or above the alarm window lower boundary temperature 1 = temperature is below the alarm window (temperature < alarm temperature lower boundary minus the hysteresis) 14 above alarm window 0 = temperature is equal to or below the alarm window upper boundary temperature minus the hysteresis 1 = temperature is above the alarm window (temperature > alarm temperature upper boundary) 15 above critical trip 0 = temperature is below the critical temperature setting minus the hysteresis 1 = temperature is equal to or above the critical temperature setting (temperature critical temperature) downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules ___________________________________________________ ___________________________________ 13 table 9. manufacturers id register (read only) [address = 06h, por = 004dh] bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0000000001001101 table 10. device id and revision register (read only) [address = 07h, por = 5400h] bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 device id (0101-0100) device revision (0000-0000) typical application circuit scl sda gnd 12 8 7 v cc event a1 a2 a0 3 4 6 5 max6604 10k 10k 10k 0.1 f v cc to smbus/i 2 c master downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules 14 _________________________________________________ _____________________________________ chip information process: bicmos package type package code outline no. land pattern no. 8 tdfn-ep t823+1 21-0174 90-0091 8 tssop h8+1 21-0175 90-0248 package information for the latest package outline information and land patterns(footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only.package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. downloaded from: http:///
max6604 precision temperature monitor for ddr memory modules 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/05 initial release 1 8/09 added 400khz serial-clock-frequency capable parts 1-4, 14, 15 2 10/10 added the soldering temperature to the absolute maximum ratings section; corrected the por state for register 07h from 3e00h to 5400h in table 2 and table 10 and corrected the device id in table 10 from 0011-1110 to 0101-0100; added the land pattern drawing numbers to the package information table 2, 6, 13, 14 3 10/11 removed the max6604ata+ from the ordering information and deleted the timing characteristicsmax6604ata+ table 1, 3 downloaded from: http:///

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