peculiarity
Accurate sensory temperature of remote diodes
Offset registers that allow the use 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 package
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The LM99 is an 11-bit 2-wire System Management Bus (SMBus) serial interface remote diode temperature sensor. LM99 Accurate Measures: (1) Own temperature and (2) remote connection into diodes, such as 2N3904 or thermal diodes, commonly used in graphics processing units (GPUs), computer processor units (CPUs or other ASICs) transistor temperature LM99 remote diode temperature sensors convert from 16°C to remote control sensors and operate to transfer temperature:
Local temperature readings are required to be unshifted.
The LM99 has an offset register that provides a means of precisely matching the various thermal diodes. Contact hardware.monitor@nsc.com for the latest details.
The LM99 and LM99-1 have the same functionality, but different SMBus slave addresses. This makes each one on the same bus at the same time.
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.
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 to 50°C, T D = 120°C to 140°C ± 1.0°C (maximum)
T = 0°C to 85°C, T D = 25°C to 140°C ± 3.0°C (maximum)
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Graphics Processor Thermal Management
Thermal management of computer processors
Electronic test equipment
Office electronics