LM93 2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors | TI.com

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
2 remote, 1 local temp sensor with hardware monitor and 16 power supply voltage monitors



The LM93, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit ΣΔ ADC, the LM93 measures the temperature of two remote diode connected transistors as well as its own die and 16 power supply voltages.

To set fan speed, the LM93 has two PWM outputs that are each controlled by up to four temperature zones. The fan-control algorithm is lookup table based. The LM93 includes a digital filter that can be invoked to smooth temperature readings for better control of fan speed. The LM93 has four tachometer inputs to measure fan speed. Limit and status registers for all measured values are included.

The LM93 builds upon the functionality of previous motherboard management ASICs and uses some of the LM85's features (i.e. smart tachometer mode). It also adds measurement and control support for dynamic Vccp monitoring and PROCHOT. It is designed to monitor a dual processor Xeon class motherboard with a minimum of external components.


  • 8-bit ΣΔ ADC
  • Monitors 16 Power Supplies
  • Monitors 2 Remote Thermal Diodes
  • Internal Ambient Temperature Sensing
  • Programmable Autonomous Fan Control Based on Temperature Readings with Fan Boost Support
  • Fan Control Based on 13-step Lookup Table
  • Temperature Reading Digital Filter
  • 1.0°C Digital Temperature Sensor Resolution
  • 0.5°C Temperature Resolution for Fan Control
  • 2 PWM Fan Speed Control Outputs
  • 4 Fan Tachometer Inputs
  • Dual Processor Thermal Throttling (PROCHOT) Monitoring
  • Dual Dynamic VID Monitoring (6 VIDs per Processor)
  • 8 General Purpose I/Os:
    • 4 Can be Configured as Fan Tachometer Inputs
    • 2 Can be Configured to Connect to THERMTRIP from a Processor
    • 2 are Standard GPIOs that Could be Used to Monitor IERR Signal
  • 2 General Purpose Inputs that Can be Used to Monitor SCSI Termination Signals
  • Limit Register Comparisons of All Monitored Values
  • 2-wire, SMBus 2.0 Compliant, Serial Digital Interface
    • Supports Byte/block Read and Write
    • Configurable Slave Address (Tri-level Pin Selects 1 of 3 Possible Addresses)
  • 2.5V Reference Voltage Output
  • 56-pin TSSOP Package
  • XOR-tree Test Mode
  • Key Specifications
    • Voltage Measurement Accuracy ±2% FS (max)
    • Resolution 8-bits, 1°C
    • Temperature Sensor Accuracy ±3°C (max)
    • Temperature Range:LM93 Operational 0°C to +85°CRemote Temp Accuracy 0°C to +125°C
    • Power Supply Voltage +3.0V to +3.6V
    • Power Supply Current 0.9 mA

All trademarks are the property of their respective owners.


Compare all products in Digital temperature sensors Email Download to Excel
Part number Order Device type Interface Local sensor accuracy (Max) (+/- C) Temp resolution (Max) (bits) Operating temperature range (C) Supply voltage (Min) (V) Supply voltage (Max) (V) Supply current (Max) (uA) Features Remote channels (#) Addresses Rating Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
LM93 Order now Fan Controller     SMBus     3     8     0 to 85     3     3.6     900     PWM output
2     3     Catalog     TSSOP | 56     56TSSOP: 113 mm2: 8.1 x 14 (TSSOP | 56)     4.50 | 1ku    
LM94 Samples not available Fan Controller     SMBus     3     8     0 to 100     3     3.6     1600     PWM output
4     3     Catalog     TSSOP | 56     56TSSOP: 113 mm2: 8.1 x 14 (TSSOP | 56)     5.89 | 1ku