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smsc emc1001 datasheet revision 1.6 (01-29-07) datasheet product features emc1001 1.5c smbus temperature sensor in miniature sot-23 general description the emc1001 is a tiny smbu s temperature sensor with 1.5 c accuracy and two interrupts. packaged in a sot23-6, the emc1001 provides an accurate, low-cost, low-current, solution for crit ical temperature monitoring in a pc or embedded applications. the emc1001 generates two separate interrupts with programmable thermal trip points. the therm output operates as a thermostat with programmable threshold and hysteresis. the alert output can be configured as a maskable smbus alert with programmable window comparator limits, or as a second therm output. an efficient fan control system can be created since this output may be used to control a fan. a power down mode extends battery life in portable applications. each part number may be configured to respond to one of four separate smbus addresses. features ? self contained internal temperature sensor 0.25 c resolution 1.5 c accuracy 40 c to 85 c ? small 6-lead sot lead-free rohs compliant packages ? smbus address selected by external resistor select 1 of 4 per package, 8 addresses available ? maskable interrupt using alert ? one-shot command during standby ? low power, 3.0v to 3.6v supply 47ua at 0.0625 conversions per second (typical) 4.8ua in standby (typical) ? smbus 2.0 compliant interface ? programmable temperature conversion rate applications ? desktop and notebook computers ? thermostats ? smart batteries ? industrial/automotive ? other electronic systems simplified block diagram emc1001 internal temp diode switching current smclk digital mux limit comparator high limit registers therm hysteresis register low limit registers therm limit register address pointer register conversion rate register interrupt masking status register configuration register smbus interface temperature register alert smdata 10-bit delta-sigma adc therm downloaded from: http:///
order number(s): emc1001-afzq-tr for 6 pin, sot 23 lead-free rohs compliant package (tape and reel) EMC1001-1-AFZQ-TR for 6 pin, sot 23 lead-free rohs compliant package (alternate addresses, tape and reel) see table 1.2, "smbus address configuration information," on page 3 reel size is 8,000 pieces. 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2007 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc products are included as a means of ill ustrating typical applications. consequently, complete in formation sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accu rate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and product descriptions at any time without notice. contact your local sm sc sales office to obtain the latest specifications before placing your product order. the provision of this inform ation does not convey to the purchaser of the described semicond uctor devices any licenses under any patent rights or other intellectual property rights of smsc or others. all sales are expressly cond itional on your agreement to the te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your or der (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from pu blished specifications. anomaly sheets are availab le upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failur e could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and /or modification will be fully at the risk of the customer. copies of this document or other smsc literature, as well as the terms of sale agreement, may be obtained by visit ing smscs website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporat ion (smsc). product names and company names are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including wi thout limitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liable for any direct, incidental, indire ct, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of wa rranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or not smsc has been advised of the poss ibility of such damages. 1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 2 smsc emc1001 datasheet downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 3 revision 1.6 (01-29-07) datasheet chapter 1 pin configuration figure 1.1 emc1001 pin configuration note 1.1 this value must be greater than 1k 5% and less than or equal to 7.5k 5% . note 1.2 the pull-up resistor must be connected to v dd (pin 1), and the total capacitance on this pin must be less than 100pf. table 1.1 pin description pin pin no. description addr/ therm 1 logic output that can be used to turn on/off a fan or throttle a cpu clock in the event of an over-temperature condition. this is an open-drain output. this pin is sampled following power up and the value of the pull up resistor determines the smbus slave address per table 1.2 .total capacitance on this pin must not exceed 100 pf, and the pull-up resistor must be connected to the same supply voltage as v dd gnd 2 ground. v dd 3 supply voltage, 3.0v to 3.6v. smclk 4 smbus clock input. alert / therm2 5 logic output used as interr upt, smbus alert or as a second therm output. this is an open-drain output. smdata 6 smbus data input/output, open drain output. table 1.2 smbus address configuration information part number addr/therm pull-up resistor smbus address package description emc1001 7.5k 5% note 1.1 , note 1.2 1001 000b 6-lead sot-23 12k 5% note 1.2 1001 001b 6-lead sot-23 20k 5% note 1.2 0111 000b 6-lead sot-23 33k 5% note 1.2 0111 001b 6-lead sot-23 emc1001-1 7.5k 5% note 1.1 , note 1.2 1001 010b 6-lead sot-23 12k 5% note 1.2 1001 011b 6-lead sot-23 20k 5% note 1.2 0111 010b 6-lead sot-23 33k 5% note 1.2 0111 011b 6-lead sot-23 64 12 3 gnd v dd smdata smclk 5 addr/therm alert/therm2 downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 4 smsc emc1001 datasheet note: stresses above those listed could cause damage to the device. this is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied. when powering this device from laboratory or system power supplie s, it is important that the absolute maximum ratings not be exceeded or device failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. if this po ssibility exists, it is suggested that a clamp circuit be used. table 1.3 absolute maximum ratings parameter rating unit supply voltage v dd -0.3 to 5.0 v voltage on alert / therm2 , smdata and smclk pins -0.3 to 5.5 v voltage on any other pin -0.3 to v dd +0.3 v operating temperature range -25 to +125 c storage temperature range -55 to +150 c lead temperature range refer to jedec spec. j-std-020 package thermal characteristics for sot23-6 power dissipation tbd mw @ 70 o c thermal resistance 111.5 o c/w esd rating, all pins (human body model) 2000 v downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 5 revision 1.6 (01-29-07) datasheet chapter 2 electrical characteristics table 2.1 electrical characteristics v dd =3.0v to 3.6v, t a = -25 c to +125 c, typical values at t a = 27 c unless otherwise noted parameter symbol min typ max units conditions dc power supply voltage v dd 3.0 3.3 3.6 v average operating current i dd 47 tbd a 0.0625 conversion/s see table 4.6, "conversion rates," on page 14 i pd 4.8 10 a standby mode temperature measurement accuracy 0.5 1.5 c4 0 c t a 85 c 1 3 c -25 c t a 125 c resolution 0.25 c conversion time 26 ms voltage tolerance voltage at pin (addr/ therm , )v tol -0.3 3.6 v voltage at pin ( alert / therm2 , smdata,smclk) v tol -0.3 5.5 v digital outputs ( addr / therm , alert / therm2 ) output low voltage v ol 0.4 v i out =-4ma high level leakage current i oh 0.1 1 a v out =v dd smbus interface (smdata,smclk) input high level v ih 2.0 v input low level v il 0.8 v input high/low current i ih /i il -1 1 a hysteresis 500 mv input capacitance 5 pf output low sink current 6 ma smdata = 0.6v smbus timing clock frequency f smb 10 400 khz spike suppression 50 ns downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 6 smsc emc1001 datasheet note 2.1 300ns rise time max is required for 400khz bus operation. for lower clock frequencies, the maximum rise time is (0.1/f smb )+50ns bus free time start to stop t buf 1.3 s hold time start t hd:sta 0.6 s setup time start t su:sta 0.6 s setup time stop t su:sto 0.6 s data hold time t hd:dat 0.3 s data setup time t su:dat 100 ns clock low period t low 1.3 s clock high period t high 0.6 s clock/data fall time t f * 300 ns *min = 20+0.1c b ns clock/data rise time t r *3 0 0 note 2.1 ns *min = 20+0.1c b ns capacitive load (each bus line) c b 0.6 400 pf table 2.1 electrical char acteristics (continued) v dd =3.0v to 3.6v, t a = -25 c to +125 c, typical values at t a = 27 c unless otherwise noted parameter symbol min typ max units conditions downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 7 revision 1.6 (01-29-07) datasheet chapter 3 system management bus interface protocol a host controller, such as an smsc i/o controlle r, communicates with the emc1001 via the two wire serial interface named smbus. th e smbus interface is used to read and write registers in the emc1001, which is a slave-only device. a detailed timing diagram is shown in figure 3.1 . figure 3.1 system management bus timing diagram the emc1001 implements a subset of the smbus s pecification and supports write byte, read byte, send byte, receive byte, and alert response address protocols. as shown. in the tables that des cribe the protocol, the gray columns indicate that the slave is driving the bus. 3.1 write byte the write byte protocol is used to write one byte of data to the registers as shown below: 3.2 read byte the read byte protocol is used to read one byte of data from the registers as shown below: 3.3 send byte the send byte protocol is used to set the internal address register to the correct address. the send byte can be followed by the receive byte protocol described below in order to read data from the register. the send byte protocol cannot be used to write data - if data is to be written to a register then the write byte protocol must be used as described in subsection above . the send byte protocol is shown in ta b l e 3 . 3 . table 3.1 smbus write byte protocol start slave address wr ack command ack data ack stop 171 18 18 11 table 3.2 smbus read byte protocol start slave address wr ack command ack start slave address rd ack data nack stop 171 18 11 7 1 1 81 1 table 3.3 smbus send byte protocol field: start slave addr wr ack reg. addr ack stop bits: 171 181 1 smdata smclk t low t r t high t f t buf t hd:sta p s s - start condition p - stop condition t hd:dat t su:dat t su:sta t hd:sta p t su:sto s downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 8 smsc emc1001 datasheet 3.4 receive byte the receive byte protocol is used to read data from a register when the internal register address pointer is known to be at the right location (e.g. set via send byte). this can be us ed for consecutive reads of the same register as shown below: 3.5 alert response address the alert / therm2 output can be used as an smbalert# as described in 4.3, "alert/therm2 output," on page 11 . the alert response address is poll ed by the host whenever it detects an smbalert#, i.e. when the alert / therm2 pin is asserted. the emc1001 will acknowlege the alert response address and respond with its device address as shown below. 3.6 smbus addresses the emc1001 is available in two versions, each of which has four 7-bit slave addresses that are enabled based on the pull-up resistor on the addr / therm pin. the value of this pull up resistor determines the slave address per table 1.2 on page 3 . attempting to communicate with the emc1001 smbus interface with an invalid slave address or invalid protocol results in no response from the device and does not affect its register contents. the emc1001 supports stretching of the smclk signal by other devices on the smbus but will not perform th is operation itself. the emc1001 has an smbus timeout feature. bit 7 of the smbus timeout enable register enables this function when set to 1 (the default setting is 0). when this feature is enable d, the smbus will timeout after approximately 25ms of inactivity. table 3.4 smbus receive byte protocol field: start slave addr rd ack reg. data nack stop bits: 171 181 1 table 3.5 modified smbus receiv e byte protocol response to ara field: start alert response address rd ack emc1001 slave address nack stop bits: 171 1 8 1 1 downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 9 revision 1.6 (01-29-07) datasheet chapter 4 product description the emc1001 is an smbus temperature that monitors a single temperature zone. thermal management is performed in cooperation with a host device. the host reads the temperature data from the emc1001 and takes appropriate action such as controlling fan speed or processor clock frequency. the emc1001 has programmable temper ature limit registers that defin e a safe operating window. after the host has configured the temperature limits, the emc1001 can operate as a free-running independent watchdog to warn the host of temperatur e hot spots without requiring the host to poll the device. the addr / therm output can be used to control a fan without host intervention. figure 4.1 controlling a fan without host intervention. the emc1001 has two basic modes of operation: ? run mode: in this mode, the emc1001 continuou sly converts temperature data and updates its registers. the rate of temperature c onversion is configured as shown in section 4.9 on page 14 . ? standby mode: in this mode, the emc1001 is plac ed in standby to conserve power as described in section 4.5 on page 12 . 4.1 temperature monitors thermal diode temperature measurements are bas ed on the change in forward bias voltage ( v be ) of a diode when operated at two different currents: the change in v be voltage is proportional to absolute temperature t. where: k = boltzmanns constant t = absolute temperature in kelvin q = electron charge = diode ideality factor addr/therm alert/therm2 emc1001 host fan driver smdata internal diode smclk smbus interface ? ? ? ? ? ? ? ? = ? = low high low be high be be i i q kt v v v ln _ _ downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 10 smsc emc1001 datasheet figure 4.2 detailed block diagram figure 4.2 shows a detailed block diagram of the temperature measurement circuit. the emc1001 incorporates switched capacitor technolog y that integrates the temperature diode v be from different bias currents. the negative terminal, dn, for the te mperature diode is internally biased with a forward diode voltage referenced to ground. the advantages of this architecture over nyquist rate flash or sar converters are superb linearity and inherent noise immunity. the linearity can be directly attributed to the delta-sigma adc single-bit comparator while the noise immunity is achieved by the ~20ms integration time which translates to 50hz input noise bandwidth. 4.2 temperature measur ement results and data the 10-bit temperature measurement results ar e stored in temperatur e value registers. table 4.1 shows the twos complement temperature data format with an lsb equivalent to 0.25 c. note 4.1 temperature measurement returns 1 100 0000 00 for all temperatures -64.00 c note 4.2 temperature measurement returns 0111 1111 11 for all temperatures +127.75 c the eight most significant bits are stored in the te mperature value high byte re gister and the two least significant bits stored in the temperature value low byte register as outlined in ta b l e 4 . 2 . the six lsb positions of the temperat ure value low byte register always read zero. in table 4.2 , the upper case table 4.1 temperature data format temperature valid range C40 c to 125 c twos complement -0.25 c 1111 1111 11 note 4.1 0.0 c 0000 0000 00 +0.25 c 0000 0000 01 +0.50 c 0000 0000 10 +0.75 c 0000 0000 11 +1 c 0000 0001 00 +125 c 0111 1101 00 note 4.2 delta vbe sample & hold i bias i low i high 1-bit delta-sigma modulator digital averaging filter v dd internal or remote diode bias diode 10-bit output downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 11 revision 1.6 (01-29-07) datasheet b shows the bit position of a 16-bit word created by concatenating the high byte and low byte, and the lower case b shows the bit position in the 10-bit value. 4.3 alert /therm2 output the alert / therm2 output asserts if an out of limit measurement is detected (ta low limit or ta > high limit). the alert / therm2 pin is an open drain output and r equires a pull up resistor to v dd .the alert / therm2 pin can be used as an smbalert#, or may be configured as a second therm output. as described in the smbus specification, an smbus slave may inform the smbus master that it wants to talk by asserting the smbalert# signal. one or more alert outputs can be hardwired together as a wired-or bus to a common input. the alert / therm2 pin resets when the emc1001 responds to an alert response address (ara=0001 100) sent by the host, and if the out of limit condition no longer exists, but it does not reset if the error condition remains. the alert / therm2 pin can be masked so that it will not assert in the event of an out of limit temperature measurement, exc ept when it is configured as a second therm pin. figure 4.3 alert response to temperature limits exceeded the alert / therm2 pin can be configured as a second therm pin that asserts when the temperature measurement exceeds the temperature high limit va lue. in this mode, the output will not de-assert until the temerature drops below the temperature high limit minus the therm hysteresis value. 4.4 addr/therm output the addr / therm output asserts if the temperature meas urement exceeds the programmable therm limit. it can be used to drive a fan or other failsafe devices. the addr / therm pin is open drain and requires a pull up resistor to v dd . the value of this pull up resistor determines the slave address per table 1.2 on page 3 . the addr / therm pin cannot be masked. when the addr / therm pin is asserted, it will not de-assert until the temperature drops below the therm limit minus the th erm hysteresis value. table 4.2 bit position of two byte values high byte low byte b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 0 0 0 temp time temperature high limit temperature low limit alert/therm2 logic high logic level smbus ara downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 12 smsc emc1001 datasheet figure 4.4 therm response to therm limit exceeded 4.5 standby mode the emc1001 can be set to standby mode (low power) by setting a bit in the configuration register as described in section 4.8 on page 13 . this shuts down all internal analog functions while the smbus remains enabled. when the emc1001 is in standby mode, a one-shot command measurement can be initiated. the user may also write new values to the limit registers described in section 4.10 on page 15 while in standby. if the previously stored temperature is outside any of the new limits, the alert / therm2 output will respond as described in section 4.3 and the addr / therm output will respond as described in section 4.4 . 4.6 register allocation the following registers shown in table 4.3 are accessible through the smbus: table 4.3 register map register address (hex) r/w register name power-on default 00 r temperature value high byte 0000 0000 01 r status undefined 02 r temperature value low byte 0000 0000 03 r/w configuration 0000 0000 04 r/w conversion rate 0000 0100 05 r/w temperature high limit high byte 0101 0101 (85 c) 06 r/w temperature high limit low byte 0000 0000 07 r/w temperature low limit high byte 0000 0000 (0 c) 08 r/w temperature low limit low byte 0000 0000 0f w one-shot n/a 20 r/w therm limit 0101 0101 (85 c) 21 r/w therm hysteresis 0000 1010 (10 c) 22 r/w smbus timeout enable 0000 0001 fd r product id register 0000 0000 (emc1001) 0000 0001 (emc1001-1) fe r manufacture id 0101 1101 ff r revision number 0000 0011 note 4.3 temp time therm limit therm limit - therm hysterisis therm therm hysteresis logic high logiclevel downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 13 revision 1.6 (01-29-07) datasheet note 4.3 revision number may change. please obtain the latest version of this document from the smsc web site. at device power-up, the default values are stored in all registers. a power-on-reset is initiated when power is first applied to the part and the v dd supply exceeds the por threshold. reads of undefined registers will return 00h and writes to undefined registers will be ignored. the emc1001 uses an interlock mechanism that locks the low byte value when the high byte register is read. this prevents updates to the low byte r egister between high byte and low byte reads. this interlock mechanism requires that the high byte register always be read prior to reading the low byte register. 4.7 status register the status register is a read only register that stores the operational status of the part. when either tlow or thigh are set (ta low limit or ta > high limit) and the alert / therm2 pin is not masked, the alert / therm2 pin will assert. see section 4.3 on page 11 for more details on the alert function. bit 7 indicates that the adc is busy converting a value. bits 6 and 5 indicate that the temperature measurement is above or below the limits respective ly. bit 0 indicates that the measured temperature has exceeded the therm limit. when bit 0 goes high the addr / therm output will be asserted. each bit is cleared individually when the status regi ster is read, provided that the error condition for that bit no longer exists. the alert / therm2 output is latched and will not be reset until the host has responded with an alert response address (ara=0001 100). the alert / therm2 output will not reset if the status register has not been cleared. 4.8 configuration register the configuration register controls the func tionality of the temperature measurements. table 4.4 status register status register bit name function 7 busy 1 when adc is converting 6 thigh 1 when temperature high limit is exceeded 5 tlow 1 when temperature low limit is exceeded 4r e s e r v e d 3r e s e r v e d 2r e s e r v e d 1r e s e r v e d 0 thrm 1 when therm limit is exceeded downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 14 smsc emc1001 datasheet bit 7 is used to mask the alert / therm2 signal. when this bit is set to 0, any out of limit condition will assert alert / therm2 . this bit is ignored if the alert / therm2 pin is configured as therm2 signal by bit 5. bit 6 initiates adc conversions. when this bit is low, the adc will convert temperatures in a continuous mode. when this bit is high, the a dc will be in standby mo de, thus reducing supply current significantly though the smbus will still be active. if bit 6 is 1 and the one-shot register is written to, the adc will execute a temperature me asurement and then retu rn to standby mode. bit 5 sets the alert / therm2 pin to act as either an smbalert# signal or as the therm2 signal. if bit 5 is set to 1 the alert / therm2 pin acts as the therm2 signal and bit 7 is ignored. 4.9 conversion rate register the conversion rate register determines how many times the temperature value will be updated per second. the lowest 4 bits configure a programmabl e delay that waits between consecutive conversion cycles to obtain the desired conversion rate. table 4.6 shows the conversion rate and the associated quiescent current. table 4.5 configuration register configuration register bit name function default 7 mask1 0 = alert enabled 1 = alert disabled 0 6 run/stop 0 = active mode (continuously running) 1 = standby mode 0 5 alert or therm2 0 = alert 1 = therm2 0 4 C 0 reserved 0 table 4.6 conversion rates conversion rate value conversions/second typical quiescent current ( a) 00h 0.0625 36 01h 0.125 37 02h 0.25 38 03h 0.5 40 04h 1 44 05h 2 54 06h 4 71 07h 8 109 08h 16 182 09h 32 326 0ah to ffh reserved downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet smsc emc1001 15 revision 1.6 (01-29-07) datasheet 4.10 limit registers the user can configure high and low temperat ure limits and an independent therm limit. the temperature high limit (t h ) is a 10-bit value that is set by the temperature high limit high byte register and the temperature high limit low byte register. the temperatur e high limit low byte register contains the two least significant bits as shown in table 4.2 on page 11 . the two least significant bits are stored in the upper two bits of the register, a nd the six lsb positions of this register always read zero. the temperature low limit (t l ) is a 10-bit value that is set by the temperature low limit high byte register and the temperature low limi t low byte register as shown in table 4.2 on page 11 . the limits are compared to the temperature measurement results (t int ) and have been exceeded if (t int t l or t int > t h ). if either limit is exceeded then the appropriate bit is set high in the status register and the alert / therm2 output will respond as described in section 4.3 on page 11 . the therm limit (t th ) is a single byte value set by the therm limit register. exceeding the therm limit asserts the addr / therm signal as described in section 4.4 on page 11 . when the alert / therm2 pin is configured as therm2 , then exceeding the high limit asserts this pin. 4.11 therm hysteresis register the therm hysteresis register holds a hysteresis value that determines the de-assertion of therm as shown in figure 4.4 on page 12 . it defaults to 10 c and can be set by the user at any time after power up. when the alert / therm2 pin is configured as therm2 , then the hysteresis value also impacts the de-assertion of therm2. 4.12 one-shot register writing to the one-shot register while in standby mode init iates a conversion and comparison cycle. the emc1001 will execute a temperature measurement, compare the data to the limit registers and return to the standby mode. a write to the one-shot register will be ignored if it occurs while the emc1001 is in run mode. 4.13 smbus timeout enable the emc1001 has an smbus timeout feature. bit 7 of the smbus timeout enable register enables this function when set to 1 (the default setting is 0). when this feature is enabled, the smbus will timeout after approximately 25ms of inactivity. downloaded from: http:///
1.5c smbus temperature sensor in miniature sot-23 datasheet revision 1.6 (01-29-07) 16 smsc emc1001 datasheet chapter 5 package outline figure 5.1 emc1001, 6 pin sot package out line; 1.6mm body width, 0.95mm pitch seating plane ccc c c detail "a" (scale: 2/1) gauge plane 0 0.25 h l l1 side view 3-d views index area (d/2 x e1/2) 3 3 5 24 4 123 n4 6 n = 5 leads n = 6 leads not es: 1. "n" is the total number of leads . 2. true position spread tolerance is 0.10mm at maximum material condition. 3. package body dimension "d" does not include mold flash, pro trusions or gate burrs. maximum mold flash, protrusions or gate burrs i s 0.25 mm per end. dimension "e1" does not include interlead flash or p rotrusion. maximum interlead flash or protrusion is 0.25 mm per side. "d1" & "e1" dimensions are determined at datum plane "h". 4. dimensions "b" & "c" apply to the flat section of the lead betwe en 0.08 to 0.15 mm from the lead tip. 5. details of pin 1 identifier are optional, but must be located wi thin the index area indicated (see top view). 6. five lead package is a version of 6 lead package, where lead #5 has been removed from 6 lead package. d e e1 e 5x b see detail "a" c top view end view a1 a2 a a initial release 7/07/04 s.k.iliev decimal x.x x.xx x.xxx material finish std compliance third angle projection print with "scale to fit" do not scale drawing approved angular unless otherwise specified dimensions are in millime ters and tolerances are: dim and tol per asme y14.5m - 1994 drawn checked name scale 80 arkay drive hauppauge, ny 11788 usa dwg number title date sheet rev revision history description revision releas ed by date s.k.iliev s.k.iliev s.k.iliev 1 - - 0.025 0.05 0.1 7/07/04 1:1 7/06/04 7/06/04 a jedec: mo-178 / aa, ab 1 of 1 1.6mm body width, 0.95mm pitch package outline: 5/6 pin sot mo-5/6 sot-2.9x1.6 downloaded from: http:///

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