Texas Instruments LM94 Handleiding

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LM94 TruTherm™ Hardware Monitor with PI Loop Fan Control for Server Management

1 Features

•8-bit ΣΔ ADC

•Monitors 16 Power Supplies

•Monitors 4 Remote Thermal Diodes and 2 LM60

•New TruTherm Technology Support for Precision

Thermal Diode Measurements

•Internal Ambient Temperature Sensing

•Programmable Autonomous Fan Control Based on

Temperature Readings with Fan Boost Support

•Fan Boost Support on Tachometer Limit Error

Event

•Fan Control Based on 13-step Lookup Table or PI

Control Loop or Combination of Both

•PI Fan Control Loop Supports Tcontrol

•Temperature Reading Digital Filters

•0.5°C digital Temperature Sensor Resolution

•0.0625°C Filtered 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 (6/7 VIDs per

processor) Supports VRD10.2/11

•8 General Purpose I/Os:

–4 Can be Configured as Fan tachometer Inputs

–2 Can be Configured to Connect to Processor

THERMTRIP

–2 are Standard GPIOs that Could be Used to

Monitor IERR Signal

•2 General Purpose Inputs that Can be Used to

Monitor the 7th VID Signal for VRD11

•Limit Register Comparisons of all Monitored

Values

•2-wire Serial Digital Interface, SMBus 2.0

Compliant

–Supports Byte/block Read and Write

–Selectable Slave Address (Tri-level Pin Selects

1 of 3 Possible Addresses)

–ALERT Output Supports Interrupt or

Comparator Modes

•2.5V Reference Voltage Output

•56-pin TSSOP Package

•XOR-tree Test Mode

•Key Specifications:

–Voltage Measurement Accuracy ... ±2% FS

(max)

–Temperature Resolution ... 9-bits, 0.5°C

–Temperature Sensor Accuracy ... ±2.5 °C (max)

–Temperature Range:

•LM94 Operational ... 0°C to +85°C

•Remote Temp Accuracy ... 0°C to +125°C

–Power Supply Voltage ... +3.0V to +3.6V

–Power Supply Current ... 1.6 mA

2 Applications

•Servers

•Workstations

•Multi-processor based equipment

3 Description

The LM94 hardware monitor has a two wire digital

interface compatible with SMBus 2.0. Using a ΣΔ

ADC, the LM94 measures the temperature of four

remote diode connected transistors as well as its own

die and 16 power supply voltages. The LM94 has new

TruTherm technology that supports precision thermal

diode measurements of processors on sub-micron

processes.

To set fan speed, the LM94 has two PWM outputs

that are each controlled by up to six temperature

zones. The fan-control algorithm can be based on

a lookup table, PI (proportional/integral) control loop,

or a combination of both. The LM94 includes digital

filters that can be invoked to smooth temperature

readings for better control of fan speed such that

acoustical noise is minimized. The LM94 has four

tachometer inputs to measure fan speed. Limit and

status registers for all measured values are included.

The LM94 builds upon the functionality of previous

motherboard server management ASICs, such as

the LM93. It also adds measurement and control

support for dynamic Vccp monitoring for VRD10/11

and PROCHOT. It is designed to monitor a dual

processor Xeon class motherboard with a minimum

of external components.

LM94

SNAS264D – APRIL 2006 – REVISED FEBRUARY 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties