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TC74A2-33VCT Datasheet

  • TC74A2-33VCT

  • Tiny Serial Digital Thermal Sensor

  • 431.28KB

  • 16頁(yè)

  • MICROCHIP   MICROCHIP

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TC74
Tiny Serial Digital Thermal Sensor
Features
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Digital Temperature Sensing in SOT-23-5 Package
Outputs Temperature as an 8-Bit Digital Word
Simple Serial Port Interface
Solid-State Temperature Sensing:
- 鹵2擄C Accuracy from +25擄C to +85擄C
- 鹵3擄C Accuracy from 0擄C to +125擄C
鈥?3.0 and 5.5V Operating Range
鈥?Low Power:
- 200碌A(chǔ) Operating
- 5碌A(chǔ) Standby Mode
General Description
The TC74 is a serially accessible digital temperature
sensor particularly suited for low cost and small form-
factor applications. Temperature data is converted from
the onboard thermal sensing element and made
available as an 8-bit digital word.
Communication with the TC74 is accomplished via a 2-
wire SMBus/I
2
C
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compatible serial port. This bus also
can be used to implement multi-drop/multi-zone
monitoring. The SHDN bit in the CONFIG register can
be used to activate the low power Standby mode.
Temperature resolution is 1擄C. Conversion rate is a
nominal 8 samples/sec. Power consumption is only
200碌A(chǔ) typ, (5碌A(chǔ) Standby, typ).
Small size, low installed cost, and ease of use make the
TC74 an ideal choice for implementing thermal
management in a variety of systems.
Applications
鈥?Thermal Protection for Hard Disk Drives
and other PC Peripherals
鈥?PC Card Devices for Notebook Computers
鈥?Low Cost Thermostat Controls
鈥?Power Supplies
鈥?Thermistor Replacement
Functional Block Diagram
Package Type
Internal Sensor
(Diode)
Serial Port
Interface
SDA
TO-220
鈭嗏垜
Modulator
SCL
TC74
Control
Logic
1 2 3 4 5
SDA
5
NC
SDA
GND
SCLK
V
DD
Temperature
Register
SOT-23
SCLK
4
TC74
1
NC
2
GND
3
V
DD
2002 Microchip Technology Inc.
DS21462B-page 1
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