TI LM89-1CIMM/NOPB

LM89 is an 11-bit digital temperature sensor with a two-wire SMBus serial interface. The LM89 accurately measures both its own temperature and the temperature of external devices, such as processor thermal diodes or diode-connected transistors like the 2N3904. Whenever a dedicated diode (semiconductor junction) is available on the target die, the LM89 can be used to accurately determine the temperature of any ASIC, GPU, FPGA, or MCU. The LM89 features an offset register for calibration against different ideality factors, eliminating the need for software management. ALERT is asserted when any temperature exceeds the preprogrammed window set by the HIGH and LOW limit registers, or exceeds the T_CRIT limit. T_CRIT_A is asserted when any temperature exceeds the preprogrammed T_CRIT limit. The LM89C and LM89-1C are functionally identical but have different SMBus slave addresses, allowing multiple LM89 devices to be connected on the same bus. The LM89-1D has a default local T_CRIT temperature limit of 105℃; all other versions default to 85℃.

• Precise remote IC die temperature or diode junction temperature sensing
• Offset register for accurate sensing of various thermal diodes
• On-board local temperature sensing
• Remote diode temperature data: 10-bit plus sign format, 0.125℃ resolution
• T_CRIT_A output for system shutdown
• ALERT output with SMBus 2.0 protocol support
• SMBus 2.0 compatible interface with TIMEOUT support
• Available in 8-pin VSSOP and SOIC packages

• Processor/computer system thermal management (e.g., laptops, desktops, workstations, servers)
• Electronic test equipment
• Office electronics