Features 8-bit [Sigma][Delta] 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 Description The LM93, hardware monitor, has a two wire digital interface compatible with SMBus 2.0. Using an 8-bit [Sigma][Delta] 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. Key Specification 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°C Remote Temp Accuracy 0°C to +125°C Power Supply Voltage +3.0V to +3.6V Power Supply Current 0.9 mA Applications Servers Workstations Multi-Microprocessor based equipment

Also Recommended LM94▲ PI Fan Control And TruTherm(TM) Remote Diode Technology

Typical Application *click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheets

Title		Size	Date	Other Language
	LM93 Hardware Monitor with Integrated Fan Control for Server Management	654 Kbytes	14-Apr-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM93CIMT/NOPB LM93CIMT RoHS Status	TSSOP	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 19 AVNET-EM Worldwide 48 DIGI-KEY Worldwide 405 MOUSER Worldwide 102 RS COMPONENTS Worldwide 1 TAYLOR Americas 19	$4.50 each at 1K+ pcs	rail of 34
LM93CIMTX/NOPB LM93CIMTX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty CEAC Asia Pacific 2000 DIGI-KEY Worldwide 0	$4.50 each at 1K+ pcs	reel of 1000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM93.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM93 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM93CIMT/NOPB LM93CIMT	222.11 223	TSSOP	56	2 2	260 235	Detail	Download	ibis file	NSUZXYTTE# LM93CIMT
LM93CIMTX/NOPB LM93CIMTX	222.11 223	TSSOP	56	2 2	260 235	Detail	Download	ibis file	NSUZXYTTE# LM93CIMT

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM93.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM93 is located at RoHS Status.

Design Tools

Title	Size	Date
SensorEval Software for Thermal Mangement Products

CAD Symbols and Models Download LM93 CAD Symbols

Models ibis file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM93CIMT	CMOS7	0	21301	0	0	1584000	3	449464325
LM93CIMTX	CMOS7	0	21301	0	0	1584000	3	449464325

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM93.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM93 is located at RoHS Status.