LM91 - Diode Input Digital Temperature Sensor with Two-Wire Interface [Obsolete]
Datasheet Obsolete Versions Knowledge Base

Features
•Directly senses die temperature of remote ICs
•Senses temperature of remote diodes
•SMBus compatible interface, supports SMBus Timeout
•Register readback capability
•7 bit plus sign temperature data format
•2 address select lines enable 9 LM91s to be connected to a single bus

Key Specification

Supply Voltage3.0V - 3.6V
Supply Current1 mA (max)
Local Temperature Accuracy±1.0°C (typ)
Remote Diode Temperature Accuracy 
+60°C to +100°C±4°C (max)
0°C to +125°C±6°C (max)

General Description

The LM91 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. More...


Applications

•System Thermal Management
•Personal Computers
•Electronic Test Equipment
•Office Electronics
•HVAC
  Typical Application
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  Block Diagram
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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM91 Diode Input Digital Temperature Sensor with Two-Wire Interface 184
Kbytes		 27-Nov-01 Download

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Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM91DIMQA
NONE
NONE
01 Dec 2004
LM91DIMQAX
NONE
NONE
01 Dec 2004

General Description

The LM91 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. The LM91 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction (semiconductor junction) is required on the target IC's die. A host can query the LM91 at any time to read the temperature of this diode as well as the temperature state of the LM91 itself. A T_CRIT_A# interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT.

The host can program as well as read back the state of the T_CRIT register. Power up default values for T_CRIT are as shown in the ordering information table. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM91.

[Information as of 8-Nov-2009]