LM89CIMM National Semiconductor, LM89CIMM Datasheet
LM89CIMM
Specifications of LM89CIMM
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LM89CIMM Summary of contents
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... Accurately senses die temperature of remote ICs or diode junctions Simplified Block Diagram Pentium ™ trademark of Intel Corporation. © 2004 National Semiconductor Corporation n Offset register allows sensing a variety of thermal diodes accurately n On-board local temperature sensing n 10 bit plus sign remote diode temperature data format, 0.125 ˚C resolution n T_CRIT_A output useful for system shutdown n ALERT output supports SMBus 2 ...
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... Connection Diagram Ordering Information Package Part Number Marking LM89CIMM LM89-1CIMM LM89CIMMX LM89-1CIMMX LM89CIM LM89CIM LM89-1CIM LM89-1CIM LM89CIMX LM89CIM LM89-1CIMX LM89-1CIM Pin Descriptions Label Pin # D− 3 T_CRIT_A 4 GND 5 ALERT 6 SMBData 7 SMBCLK 8 www.national.com MSOP-8 or SOIC-8 TOP VIEW NS Package Number T15C MUA08A (MSOP-8) T19C ...
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Typical Application 3 20041503 www.national.com ...
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... Remote D Diode Junction Temperature) Remote Diode Measurement Resolution Local Diode Measurement Resolution Conversion Time of All Temperatures at the Fastest Setting Quiescent Current (Note 9) D− Source Voltage Diode Source Current ALERT and T_CRIT_A Output Saturation Voltage ...
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... Temperature-to-Digital Converter Characteristics Unless otherwise noted, these specifications apply for V ≤T ≤ all other limits MIN A MAX A Parameter Remote T_CRIT Default Temperature Setting Logic Electrical Characteristics DIGITAL DC CHARACTERISTICS Unless otherwise noted, these specifications apply for V its apply for MIN MAX Symbol ...
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... LM89 and the thermal resistance. See (Note 5) for the thermal resistance to be used in the self-heating calculation. Note 9: Quiescent current will not increase substantially with an SMBus. Note 10: This specification is provided only to indicate how often temperature data is updated. The LM89 can be read at any time without regard to conversion state (and will yield last conversion result). ...
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... ALERT mask bit is not high, any bit set in the STATUS REGISTER, with the exception of Busy (D7) and OPEN (D2), will cause the ALERT output to be pulled low. Any temperature conversion that is out of the limits defined by the temperature setpoint registers will trigger an ALERT. Addi- tionally, the ALERT mask bit in the Configuration register must be cleared to trigger an ALERT in all modes ...
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... Master resets the ALERT mask (D7 in the Configuration register). www.national.com (Continued) 20041531 FIGURE 4. ALERT Output as an Interrupt Temperature 1.2.3 ALERT Output as an SMBus ALERT When the ALERT output is connected to one or more ALERT outputs of other SMBus compatible devices and to a master, an SMBus alert line is created. Under this implementation, the LM89’ ...
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... LM89 remains in these states until after the first conversion. 1. Command Register set to 00h 2. Local Temperature set to 0˚C 3. Remote Diode Temperature set to 0˚C until the end of the first conversion. 4. Status Register set to 00h. 5. Configuration register set to 00h; ALERT enabled, Re- ...
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... If the location latched in the Command Register is cor- rect (most of the time it is expected that the Command Register will point to one of the Read Temperature Reg- isters because that will be the data most frequently read from the LM89), then the read can simply consist of an address byte, followed by retrieving the data byte ...
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... SMBus start condition at any point during the communi- cation. After the start the LM89 will expect an SMBus Address address byte. ). TIMEOUT 1.11 DIGITAL FILTER In order to suppress erroneous remote temperature readings due to noise, the LM89 incorporates a user-configured digital filter. The filter is accessed in the FILTER and ALERT CON- 11 20041510 20041511 20041512 www ...
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Functional Description FIGURE REGISTER at BFh. The filter can be set according to the following table Step Response FIGURE 9. Digital Filter Response in a Pentium 4 processor ...
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... FAULT QUEUE In order to suppress erroneous ALERT or T_CRIT triggering the LM89 incorporates a Fault Queue. The Fault Queue acts to insure a remote temperature measurement is genuinely beyond a HIGH, LOW or T_CRIT setpoint by not triggering until three consecutive out of limit measurements have been made, see Figure 10. The fault queue defaults off upon power-up and may be activated by setting bit D0 in the Configuration register (09h) to “ ...
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... For RTLB D7–D5: Temperature Data. LSB = 0.125˚C. Two’s complement format. The maximum value available from the Local Temperature register is 127; the minimum value available from the Local Temperature register is -128. The maximum value available from the Remote Temperature register is 127.875; the minimum value available from the Remote Temperature registers is −128.875. ...
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... LOCAL and REMOTE LOW SETPOINT REGISTERS (LLS, RLSHB, and RLSLB) (Read Address 06h, 08h, /Write Address 0Ch, 0Eh): BIT Value SIGN For LLS and RLSHB: HIGH setpoint temperature data. Power up default is LHIGH = RHIGH = 0˚C. 1 LSB = 1˚C. Two’s complement format. (Read/Write Address 14h): BIT Value For RLSLB: Remote HIGH Setpoint Low Byte temperature data. Power up default is 0˚ ...
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... DIE REVISION CODE REGISTER (Read Address FFh) The LM89 version has a default value of 31h or 49 decimal. The LM89-1 version has a default value of 34h or 52 decimal. This register will increment by 1 every time there is a revision to the die by National Semiconductor. 3.0 Applications Hints ...
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... Compensating for Diode Non-Ideality In order to compensate for the errors introduced by non- ideality, the temperature sensor is calibrated for a particular processor. National Semiconductor temperature sensors are always calibrated to the typical non-ideality of a given pro- cessor type. The LM89 is calibrated for the non-ideality of a ...
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... Leakage current between D+ and GND should be kept to a minimum. One nano-ampere of leakage can cause as much as 1˚C of error in the diode temperature read- ing. Keeping the printed circuit board as clean as pos- sible will minimize leakage current. Noise coupling into the digital lines greater than 400mVp-p ...
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... Wide) Molded Narrow Small-Outline Package (SOIC), 8-Lead Molded Mini-Small-Outline Package (MSOP), JEDEC Registration Number MS-012 Order Number LM89CIM or LM89CIMX NS Package Number M08A JEDEC Registration Number MO-187 Order Number LM89CIMM or LM89CIMMX NS Package Number MUA08A 19 www.national.com ...
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... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...