LM89CIMMX National Semiconductor, LM89CIMMX Datasheet
LM89CIMMX
Available stocks
Related parts for LM89CIMMX
LM89CIMMX Summary of contents
Page 1
... 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 ...
Page 2
... 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 ...
Page 3
Typical Application 3 20041503 www.national.com ...
Page 4
Absolute Maximum Ratings Supply Voltage Voltage at SMBData, SMBCLK, ALERT, T_CRIT_A Voltage at Other Pins D− Input Current Input Current at All Other Pins (Note 2) Package Input Current (Note 2) SMBData, ALERT, T_CRIT_A Output Sink Current Storage Temperature Temperature-to-Digital ...
Page 5
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, ...
Page 6
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: When the input voltage (V ) ...
Page 7
Functional Description The LM89 temperature sensor incorporates a delta V based temperature sensor using a Local or Remote diode and a 10-bit plus sign ADC (Delta-Sigma Analog-to-Digital Converter). The LM89 is compatible with the serial SMBus version 2.0 two-wire ...
Page 8
Functional Description FIGURE 3. ALERT Comparator Temperature Response Diagram 1.2.2 ALERT Output as an Interrupt The LM89’s ALERT output can be implemented as a simple interrupt signal when it is used to trigger an interrupt service routine. In such ...
Page 9
Functional Description 1. Master Senses SMBus alert line low 2. Master sends a START followed by the Alert Response Address (ARA) with a Read Command. 3. Alerting Device(s) send ACK. 4. Alerting Device(s) send their Address. While transmitting their ...
Page 10
Functional Description available in two 8-bit registers: Temperature Digital Output Binary +125˚C 0111 1101 0000 0000 +25˚C 0001 1001 0000 0000 +1˚C 0000 0001 0000 0000 +0.125˚C 0000 0000 0010 0000 0˚C 0000 0000 0000 0000 −0.125˚C 1111 1111 ...
Page 11
Functional Description (a) Serial Bus Write to the internal Command Register followed by a the Data Byte (b) Serial Bus Write to the Internal Command Register (c) Serial Bus Read from a Register with the Internal Command Register preset ...
Page 12
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 ...
Page 13
Functional Description 1.12 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 ...
Page 14
LM89 Registers (Continued) Command Select Address Read Address Write Address < > < > P7:P0 hex P7:P0 hex 12h 12h 13h 13h 14h 14h 19h 19h 20h 20h 21h 21h B0h-BEh B0h-BEh BFh BFh FEh NA FFh NA 2.2 ...
Page 15
LM89 Registers (Continued) D6: RUN/STOP: When set to “1” SHUTDOWN is enabled. D5: is not defined and defaults to “0”. D4: Remote T_CRIT mask: When set to “1” a diode temperature reading that exceeds T_CRIT setpoint will not activate ...
Page 16
... 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 ...
Page 17
... 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 0.13 micron, Mobile Pentium 4, 1.0021. When a temperature ...
Page 18
Applications Hints 3.2 PCB LAYOUT for MINIMIZING NOISE FIGURE 11. Ideal Diode Trace Layout In a noisy environment, such as a processor mother board, layout considerations are very critical. Noise induced on traces running between the remote temperature diode ...
Page 19
... 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 ...
Page 20
... 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’ ...