TC74
Tiny Serial Digital Thermal Sensor
Features
General Description
• Digital Temperature Sensing in SOT-23-5 or
TO-220 Packages
• Outputs Temperature as an 8-Bit Digital Word
• Simple SMBus/I2C™ Serial Port Interface
• Solid-State Temperature Sensing:
- ±2°C (max.) Accuracy from +25°C to +85°C
- ±3°C (max.) Accuracy from 0°C to +125°C
• Supply Voltage of 2.7V to 5.5V
• Low Power:
- 200 µA (typ.) Operating Current
- 5 µA (typ.) Standby Mode Current
The TC74 is a serially accessible, digital temperature
sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from
the onboard thermal sensing element and made
available as an 8-bit digital word.
Applications
• Thermal Protection for Hard Disk Drives
and other PC Peripherals
• PC Card Devices for Notebook Computers
• Low Cost Thermostat Controls
• Power Supplies
• Thermistor Replacement
Package Types
Communication with the TC74 is accomplished via a 2wire SMBus/I2C 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°C. Conversion rate is a
nominal 8 samples/sec. During normal operation, the
quiescent current is 200 µA (typ). During standby
operation, the quiescent current is 5 µA (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.
Functional Block Diagram
Internal Sensor
(Diode)
TO-220
SOT-23
SCLK
SDA
SCLK
5
4
Modulator
TC74
Control
Logic
TC74
12345
NC
SDA
GND
SCLK
VDD
SDA
Serial Port
Interface
1
2
3
NC
GND
VDD
Temperature
Register
Note: The TO-220 tab is connected
to pin 3 (GND)
2001-2012 Microchip Technology Inc.
DS21462D-page 1
TC74
1.0
ELECTRICAL
CHARACTERISTICS
1.1
Absolute Maximum Ratings†
Supply Voltage (VDD) ............................................ +6V
Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V)
† Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operation listings of this specification is
not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Current On Any Pin ..........................................±50 mA
Operating Temperature (TA) ........ -40°C TA +125°C
Storage Temperature (TSTG) ..............-65°C to +150°C
Junction Temperature (TJ)................................ +150°C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and
VDD = 5.0V for TC74AX-5.0VXX, -40°C TA 125°C. Note 5
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power-on Reset Threshold
VPOR
1.2
—
2.2
V
Supply Voltage
VDD
2.7
—
5.5
V
Note 5
Operating Current
IDD
—
200
350
µA
VDD = 5.5V, Note 1
IDD-STANDBY
—
5.0
10
µA
VDD = 3.3V
Serial Port Inactive, Note 4
TERR
-2.0
-3.0
—
—
—
±2.0
+2.0
+3.0
—
°C
+25°C
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