2001-2012 Microchip Technology Inc. DS21490D-page 1
TCN75
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 V
DD
= 3V
•Low Power:
- 250 A (Typ.) Operating
-1 A (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
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.
1
2
3
4
8
7
6
5
TCN75MOA
1
2
3
4
8
7
6
5
TCN75MUA
A1
A0
A2
SOIC
MSOP
SCL
INT/CMPTR
GND
SDA
SCL
INT/CMPTR
GND
SDA
V
DD
A1
A0
A2
V
DD
2-Wire Serial Temperature Sensor and Thermal Monitor
