TCN75(2002) データシートの表示（PDF） - Microchip Technology

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TCN75
(Rev.:2002)

2-Wire Serial Temperature Sensor and Thermal Monitor

Microchip Technology 

TCN75

2-Wire Serial Temperature Sensor and Thermal Monitor

Features

• Solid-State Temperature Sensing;

0.5°C Accuracy (Typ.)

• Operates from -55°C to +125°C

• Operating Supply Range: 2.7V to 5.5V

• Programmable Trip Point and Hysteresis with

Power-up Defaults

• Standard 2-Wire Serial Interface

• Thermal Event Alarm Output Functions as

Interrupt or Comparator / Thermostat Output

• Up to 8 TCN75s may Share the Same Bus

• Shutdown Mode for Low Standby Power

Consumption

• 5V Tolerant I/O at VDD = 3V

• Low Power:

- 250µA (Typ.) Operating

- 1µA (Typ.) Shutdown Mode

• 8-Pin SOIC and MSOP Packaging

Applications

• Thermal Protection for High Performance CPUs

• Solid-State Thermometer

• Fire/Heat Alarms

• Thermal Management in Electronic Systems:

- Computers

- Telecom Racks

- Power Supplies / UPS/ Amplifiers

• Copiers / Office Electronics

• Consumer Electronics

• Process Control

Package Type

SOIC

SDA 1

SCL 2

INT/CMPTR 3

GND 4

8 VDD

7 A0

TCN75MOA

6 A1

5 A2

MSOP

SDA 1

SCL 2

INT/CMPTR 3

GND 4

8 VDD

7 A0

TCN75MUA

6 A1

5 A2

General Description

The TCN75 is a serially programmable temperature

sensor that notifies the host controller when ambient

temperature exceeds a user programmed set point.

Hysteresis is also programmable. The INT/CMPTR

output is programmable as either a simple comparator

for thermostat operation or as a temperature event

interrupt. Communication with the TCN75 is

accomplished via a two-wire bus that is compatible with

industry standard protocols. This permits reading the

current temperature, programming the set point and

hysteresis, and configuring the device.

The TCN75 powers up in Comparator mode with a

default set point of 80°C with 5°C hysteresis. Defaults

allow independent operation as a stand-alone

thermostat. A shutdown command may be sent via the

2-wire bus to activate the low power Standby mode.

Address selection inputs allow up to eight TCN75s to

share the same 2-wire bus for multizone monitoring.

All registers can be read by the host and the INT/

CMPTR output's polarity is user programmable. Both

polled and interrupt driven systems are easily

accommodated. Small physical size, low installed cost,

and ease of use make the TCN75 an ideal choice for

implementing sophisticated system management

schemes.

© 2002 Microchip Technology Inc.

DS21490B-page 1

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