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?2002 Microchip Technology Inc.
DS20092A-page 1
M
TC77
Features
" Digital Temperature Sensing in 5-Pin SOT-23A
and 8-Pin SOIC Packages
"  Outputs Temperature as a 13-Bit Digital Word
"  SPI and MICROWIRE" Compatible Interface
"  Solid State Temperature Sensing
"  ?癈 (max.) accuracy from +25癈 to +65癈
"  ?癈 (max.) accuracy from -40癈 to +85癈
"  ?癈 (max.) accuracy from -55癈 to +125癈
"  2.7V to 5.5V Operating Range
"  Low Power
-  250 礎 (typ.) Continuous Conversion Mode
-  0.1 礎 (typ.) Shutdown Mode
Typical Applications
"  Thermal Protection for Hard Disk Drives and
Other PC Peripherals
"  PC Card Devices for Notebook Computers
"  Low Cost Thermostat Controls
"  Industrial Control
"  Office Equipment
"  Cellular Phones
"  Thermistor Replacement
Block Diagram
Description
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 twos 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癈
per Least Significant Bit (LSb). The TC77 offers a tem-
perature accuracy of ?.0癈 (max.) over the tempera-
ture range of +25癈 to +65癈. When operating, the
TC77 consumes only 250 礎 (typ.). The TC77s Con-
figuration register can be used to activate the low
power Shutdown mode, which has a current consump-
tion of only 0.1 礎 (typ.). Small size, low cost and ease
of use make the TC77 an ideal choice for implementing
thermal management in a variety of systems.
Package Types
Typical Application
TC77
Diode
Temperature
Sensor
V
DD
SCK
CS
Serial
Port
Interface
SI/O
13-Bit
Sigma Delta
A/D Converter
Register
Temperature
Register
Internal
Configuration
Manufacturer
ID Register
V
SS
SOT-23-5
1
SOIC
1
V
DD
V
SS
SCK
SI/O
CS
TC77
TC77
SCK
SI/O
V
SS
NC
CS
V
DD
NC
NC
AN0
SCK
SDI
CS
SCK
SI/O
TC77
0.1礔
V
DD
V
SS
V
DD
PICmicro
?/DIV>
MCU
Thermal Sensor with SPI
"
 Interface
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