TCN75A_1 Datasheet, PDF (1/40 Pages) Microchip Technology – 2-Wire Serial Temperature Sensor

TCN75A
2-Wire Serial Temperature Sensor
Features:
• Temperature-to-Digital Converter
• Accuracy:
- ±1 (typical) from -40°C to +125°C
- ±2°C (maximum) from -40°C to +125°C
• User-selectable Resolution: 0.5°C to 0.0625°C
• Operating Voltage Range: 2.7V to 5.5V
• 2-wire Interface: I²C™ Compatible
• Operating Current: 200 µA (typical)
• Shutdown Current: 2 µA (maximum)
• Power-saving One-shot Temperature
Measurement
• Available Packages: MSOP-8, SOIC-8
Typical Applications:
• Personal Computers and Servers
• Hard Disk Drives and Other PC Peripherals
• Entertainment Systems
• Office Equipment
• Data Communication Equipment
• General Purpose Temperature Monitoring
Typical Application
V_DD
PIC^®
Microcontroller ^R
SDA
I/O Ports ^SCL
ALERT
R_PULL-UP
V_DD
1 SDA V_DD 8
2 SCL A0 7
3 ALERT A1 6
4 GND A2 5
TCN75A
Description:
Microchip Technology Inc.’s TCN75A digital tempera-
ture sensor converts temperatures between -40°C and
+125°C to a digital word, with ±1°C (typical) accuracy.
The TCN75A product comes with user-programmable
registers that provide flexibility for temperature-sensing
applications. The register settings allow
user-selectable, 0.5°C to 0.0625°C temperature
measurement resolution, configuration of the
power-saving Shutdown and One-shot (single
conversion on command while in Shutdown) modes
and the specification of both temperature alert output
and hysteresis limits. When the temperature changes
beyond the specified limits, the TCN75A outputs an
alert signal. The user has the option of setting the alert
output signal polarity as an active-low or active-high
comparator output for thermostat operation, or as
temperature event interrupt output for
microprocessor-based systems.
This sensor has an industry standard 2-wire, I²C™
compatible serial interface, allowing up to eight devices
to be controlled in a single serial bus. These features
make the TCN75A ideal for low-cost, sophisticated
multi-zone temperature-monitoring applications.
Package Types
8-Pin SOIC, MSOP
SDA 1
SCL 2
ALERT 3
GND 4
8 V_DD
7 A0
6 A1
5 A2
 2010 Microchip Technology Inc.
DS21935D-page 1