LM93 (ACTIVE)

Hardware Monitor with Integrated Fan Control for Server Management

Hardware Monitor with Integrated Fan Control for Server Management - LM93
Datasheet
LM93 Hardware Monitor with Integrated Fan Control for Server Management datasheet (Rev. E)
 

Description

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.

Features

  • 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

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Parametrics Compare all products in Monitoring & Fan Control

 
Analog Inputs
No. of Temperature Sensors
Pin/Package
Operating Temperature Range (C)
Temperature Sensor Accuracy (C)
Temperature Sensor Resolution (C)
PWM Duty Cycle Resolution (bits)
GPIOs
Fan Speed Measurement Accuracy (%)
Rating
Interface Type
Fan Control Method
Fan Control Output(s)
TruTherm(TM) Beta Compensation
VID Inputs
Fan Speed Inputs
Interrupt Outputs (Count)
Quiescent Current (mA)
Voltage in ADC Resolution (bits)
LM93 LM94
15 and V+    15 to 13 and V+   
3    5   
56TSSOP    56TSSOP   
0 to 85    0 to 100   
3    3   
1    1   
8    9   
16 power supply monitors
2 PWM
4 TACH
2 PROCHOT
12 VID
8 GPIO
2 GPI
2 VRDHOT   		 16 power supply monitors
2 PWM
4 TACH
2 PROCHOT
14 VID
8 GPIO
2 GPI
ALERT
2 VRDHOT   
6    6   
Catalog    Catalog   
SMBus    SMBus   
Lookup Table    PI and Lookup Table   
2 PWM
22.5kHz   		 2 PWM
22.5kHz   
No    Yes   
Dual 6    Dual 7   
4    4   
1    1   
0.9    1.6   
8    8   

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