peculiarity
Accurate sensory death temperature at the junction of remote ICs or diodes
The offset registers allow for precise induction of various thermal diodes
Local temperature sensing
Temperature data format for 10-bit plus remote diode with resolution 0.125°C,
T_CRIT_A# outputs useful system shutdowns
ALERT# outputs support SMBus for the 2.0 protocol
SMBus 2.0 compatible interface with support for timeouts
8-pin MSOP and SOIC packages
illustrate
The LM89 is an 11-bit digital temperature sensor with a two-wire System Management Bus (SMBus) serial interface. The LM89 accurately measures its own temperature as well as the temperature of external devices, such as the thermal diode of the processor or the transistor connected to the 2N3904 diode. The temperature of any ASIC can be accurately determined using LM89 as long as a dedicated diode (semiconductor junction) is targeted. The LM89 ± 0.75°C for the accuracy of the remote sensor, the factory inlaid series resistor and the 1.0021 typical non-ideal factor for the Intel ® Pentium ™4 Mobile Pentium ™4 processor-M thermal diode. The LM89 has an offset register that allows for additional diode measurements without the need for continuous software management. Contact hardware.monitor.team@nsc.com for the latest data on new processors.
LM89 and LM89-1 have the same functionality, but different SMBus slave addresses. This makes every bus simultaneous.
Activated alarm output # occurs in the high and low temperature limit registers set in a pre-programmed window outside of any temperature rise or exceeds the T_CRIT temperature limit. #When T_CRIT_A is activated, any temperature exceeds T_CRIT programming limit. The LM89 is pin and register compatible with the LM86, LM90, Analog Devices ADM1032 and Maxim MAX6657/8.
Key specifications:
Supply voltage from 3.0 V to 3.6 V
Supply Current 0.8 mA (typical)
Local temperature accuracy (including quantification error)
TA = 25°C to 125°C ± 3.0°C (max)
Remote diode temperature accuracy (including quantization error)
T A = 30 ° C, T D = 80 ° C ± 0.75 ° C (maximum)
T A = 30°C to 50°C, T D = 60°C to 100°C ± 1.0°C (maximum)
T = 0°C to 85°C, T D = 25°C to 125°C ± 3.0°C (maximum)
apply
Processor/PC system thermal management (e.g. laptops, desktops, workstations, servers)
Electronic test equipment
Office electronics