LM84

具有 SMBus 和 I2C 接口的 ±1°C 远程和本地温度传感器

The 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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Directly senses die temperature of remote ICs

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Senses temperature of remote diodes

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SMBus compatible interface, supports SMBus Timeout

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Register readback capability

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7 bit plus sign temperature data format

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2 address select lines enable 9 LM84s to be connected to a single bus

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## Key Specifications

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Supply Voltage| 3.0V - 3.6V

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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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