±1°C Remote and Local Temperature Sensor with SMBus, I2C Interface

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Product details

Parameters

Local sensor accuracy (Max) (+/- C) 1 Product type Remote Operating temperature range (C) 0 to 125 Supply voltage (Min) (V) 3 Interface type I2C, SMBus, 2-Wire Supply voltage (Max) (V) 3.6 Supply current (Max) (uA) 1000 Temp resolution (Max) (bits) 8 Features ALERT Remote channels (#) 1 Addresses 9 Rating Catalog open-in-new Find other Digital temperature sensors

Package | Pins | Size

SSOP (DBQ) 16 29 mm² 4.9 x 6 open-in-new Find other Digital temperature sensors

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 LM84s to be connected to a single bus

Key Specifications

Supply Voltage 3.0V - 3.6V
Supply Current 1 mA (max)
Local Temperature Accuracy ±1.0°C (typ)
Remote Diode Temperature Accuracy  
+60°C to +100°C ±3°C (max)
0°C to +125°C ±5°C (max)

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Description

The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface. The LM84 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 LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 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. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT.


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Technical documentation

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Type Title Date
* Datasheet LM84 Diode Input Digital Temperature Sensor with Two-Wire Interface datasheet (Rev. B) May 03, 2004
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Technical articles How to enable thermal safety for automotive infotainment and cluster systems Oct. 15, 2019
Technical articles Driving industrial innovation with small-size sensors Sep. 12, 2019
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