MC74 Datasheet, PDF (1/12 Pages) ON Semiconductor – Serial Digital Temperature Sensor

MC74
Serial Digital
Temperature Sensor
The MC74 is a serial digital temperature sensor suited for low cost
applications. Temperature data is converted from the integrated thermal
sensing element and made available as an 8–bit serial digital word.
Communication with the MC74 is accomplished via 2–wire
SMBus/I²C–compatible serial port. Temperature resolution is 1°C.
Conversion rate is a nominal 8 samples/sec. Power consumption is
only 200 µA (5 µA Standby).
Features
• Tested Operating Temperature Range: –40°C to +125°C
• Simple Serial Port Interface
• Solid State Temperature Sensing:
±2°C Accuracy from +25°C to +85°C
±3°C Accuracy from 0°C to +125°C
• 3.3V and 5.5V Versions
Typical Applications
• Thermal Protection for Hard Disk Drives and Other PC Peripherals
• Low–Cost Thermostat Controls
• Power Supplies
FUNCTIONAL BLOCK DIAGRAM
Internal Sensor
(Diode)
DS Modulator
Serial Port
Interface
Control
Logic
SDA
SCL
Temperature
Register
http://onsemi.com
SOT–23–5
SN SUFFIX
CASE TBD
PRELIMINARY INFORMATION
PIN CONFIGURATION
(Top View)
NC ¹
5 _SDA
GND ²
VDD ³
4 _SCL
SOT–23–5*
NOTE: *SOT–23–5 is equivalent to EIAJ–SC74A
1
5
TO–220–5
T SUFFIX
CASE TBD
PRELIMINARY INFORMATION
© Semiconductor Components Industries, LLC, 1999
February, 2000 – Rev. 0
ORDERING INFORMATION
Device
Package
Voltage
MC74A5–33SNTR SOT–23–5
3.3V VDD
MC74A5–50T
TO–220–5
5.0V VDD
1
Publication Order Number:
MC74/D