TC77
Thermal Sensor with SPI Interface
Features
Description
• Digital Temperature Sensing in 5-Pin SOT-23A
and 8-Pin SOIC Packages
The TC77 is a serially accessible digital temperature
sensor particularly suited for low cost and small form-
factor applications. Temperature data is converted from
the internal thermal sensing element and made avail-
able at anytime as a 13-bit two’s compliment digital
word. Communication with the TC77 is accomplished
via a SPI and MICROWIRE compatible interface. It has
a 12-bit plus sign temperature resolution of 0.0625°C
per Least Significant Bit (LSb). The TC77 offers a tem-
perature accuracy of ±1.0°C (max.) over the tempera-
ture range of +25°C to +65°C. When operating, the
TC77 consumes only 250 µA (typ.). The TC77’s Con-
figuration register can be used to activate the low
power Shutdown mode, which has a current consump-
tion of only 0.1 µA (typ.). Small size, low cost and ease
of use make the TC77 an ideal choice for implementing
thermal management in a variety of systems.
• Outputs Temperature as a 13-Bit Digital Word
• SPI and MICROWIRE™ Compatible Interface
• Solid State Temperature Sensing
• ±1°C (max.) accuracy from +25°C to +65°C
• ±2°C (max.) accuracy from -40°C to +85°C
• ±3°C (max.) accuracy from -55°C to +125°C
• 2.7V to 5.5V Operating Range
• Low Power
- 250 µA (typ.) Continuous Conversion Mode
- 0.1 µA (typ.) Shutdown Mode
Typical Applications
• Thermal Protection for Hard Disk Drives and
Other PC Peripherals
Package Types
• PC Card Devices for Notebook Computers
• Low Cost Thermostat Controls
• Industrial Control
SOT-23-5
SOIC
TC77
VDD
CS
1
SI/O
SCK
NC
VDD
SI/O
CS
1
• Office Equipment
VSS
TC77
• Cellular Phones
NC
NC
SCK
• Thermistor Replacement
VSS
Block Diagram
Typical Application
VDD
VDD
Internal
Diode
TC77
0.1µF
Temperature
Sensor
VDD
PIC®
MCU
TC77
Manufacturer
ID Register
13-Bit
Sigma Delta
A/D Converter
CS
SCK
SI/O
VSS
AN0
SCK
SDI
CS
Serial
Port
Interface
SI/O
Temperature
Register
SCK
VSS
Configuration
Register
2002-2012 Microchip Technology Inc.
DS20092B-page 1