LM93CIMT National Semiconductor, LM93CIMT Datasheet

LM93CIMT

Manufacturer Part Number

LM93CIMT

Description

Microprocessor Support IC

Manufacturer

National Semiconductor

Datasheets

1.LM93CIMT.pdf (92 pages)

2.LM93CIMT.pdf (92 pages)

Specifications of LM93CIMT

Peak Reflow Compatible (260 C)

Supply Voltage Max

3.6V

Leaded Process Compatible

Supply Voltage Min

Operating Temperature Min

0ï¿½ï¿½C

Package / Case

56-TSSOP

Operating Temperature Max

85Â°C

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Price

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Part Number:

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Quantity:

400

Current page: 1 of 92
Download datasheet (655Kb)

LM93

Hardware Monitor with Integrated Fan Control for Server

Management

1.0 General Description

The LM93, hardware monitor, has a two wire digital interface

compatible with SMBus 2.0. Using an 8-bit Σ∆ ADC, the

LM93 measures the temperature of two remote diode con-

nected 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 read-

ings 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 mother-

board management ASICs and uses some of the LM85’s

features (i.e. smart tachometer mode). It also adds measure-

ment 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.

2.0 Features

n 8-bit Σ∆ ADC

n Monitors 16 power supplies

n Monitors 2 remote thermal diodes

n Internal ambient temperature sensing

n Programmable autonomous fan control based on

n Fan control based on 13-step lookup table

n Temperature reading digital filter

n 1.0˚C digital temperature sensor resolution

n 0.5˚C temperature resolution for fan control

n 2 PWM fan speed control outputs

n 4 fan tachometer inputs

n Dual processor thermal throttling (PROCHOT)

5.0 Ordering Information

I 2 C is a registered trademark of the Philips Corporation.

Order Number NS Package Number Transport media

LM93CIMT

LM93CIMTX

temperature readings with fan boost support

monitoring

MTD56

DS200682

34 units in rail

1000 units in tape-and-reel

n Dual dynamic VID monitoring (6 VIDs per processor)

n 8 general purpose I/Os:

n 2 general purpose inputs that can be used to monitor

n Limit register comparisons of all monitored values

n 2-wire, SMBus 2.0 compliant, serial digital interface

n 2.5V reference voltage output

n 56-pin TSSOP package

n XOR-tree test mode

3.0 Key Specifications

n Voltage Measurement Accuracy

n Resolution

n Temperature Sensor Accuracy

n Temperature Range:

n Power Supply Voltage

n Power Supply Current

4.0 Applications

n Servers

n Workstations

n Multi-Microprocessor based equipment

SCSI termination signals

— 4 can be configured as fan tachometer inputs

— 2 can be configured to connect to THERMTRIP from

— 2 are standard GPIOs that could be used to monitor

— Supports byte/block read and write

— Configurable slave address (tri-level pin selects 1 of

— LM93 Operational

— Remote Temp Accuracy

a processor

IERR signal

3 possible addresses)

+3.0V to +3.6V

0˚C to +125˚C

www.national.com

2% FS (max)

0˚C to +85˚C

8-bits, 1˚C

April 2004

3˚C (max)

0.9 mA

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