TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
• User Programmable Hysteresis and
Temperature Set Point
• Easily Programs with 2 External Resistors
• Wide Temperature Detection Range:
-0°C to 70°C: (TC620/TC621CCX)
-40°C to +125°C: (TC620/TC621CVX)
-40°C to +85°C: (TC620/TC621CEX)
-55°C to +125°C: (TC620/TC621CMX)
• Onboard Temperature Sensing Applications
(TC620X)
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
• Available in 8-Pin PDIP and SOIC Packages
Package Type
8-PDIP
NC 1
LOW SET 2
HIGH SET 3
GND 4
8
VDD
TC620XCPA
TC620XEPA
7 HIGH LIMIT
6 LOW LIMIT
5 CONTROL
8-PDIP
THERMISTOR 1
HIGH SET 2
LOW SET 3
GND 4
8
VDD
TC621XCPA
TC621XEPA
7 HIGH LIMIT
6 LOW LIMIT
5 CONTROL
8-SOIC
NC 1
LOW SET 2
8
VDD
LOW LIMIT
HIGH LIMIT
CONTROL
Applications
•
•
•
•
Power Supply Over Temperature Detection
Consumer Equipment
Temperature Regulators
CPU Thermal Protection
HIGH SET 3
GND 4
TC620XCOA
TC620XEOA
TC620CVOA
8-SOIC
7
6
5
THERMISTOR 1
8
VDD
Device Selection Table
Part Number
TC620X*COA
TC620X*CPA
TC620X*EOA
TC620X*EPA
TC620C*VOA
TC621X*COA
TC621X*CPA
TC621X*EOA
TC621X*EPA
Package
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
Temperature
Range
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
HIGH SET 2
LOW SET 3
GND 4
TC621XCOA
TC621XEOA
7 HIGH LIMIT
6 LOW LIMIT
5 CONTROL
General Description
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal
management applications. The TC620 features an
onboard temperature sensor, while the TC621
connects to an external NTC thermistor for remote
sensing applications.
Both devices feature dual thermal interrupt outputs
(HIGH LIMIT and LOW LIMIT), each of which is pro-
grammed with a single external resistor. On the TC620,
these outputs are driven active (high) when measured
temperature equals the user programmed limits. The
CONTROL (hysteresis) output is driven high when tem-
perature equals the high limit setting and returns low
when temperature falls below the low limit setting. This
output can be used to provide ON/OFF control to a
cooling fan or heater. The TC621 provides the same
output functions except that the logical states are
inverted.
The TC620/TC621 are usable over operating
temperature ranges of 0°C to 70°C, -40°C to +125°C
and -55°C to 125°C.
NOTE:
*The part code will be C or H.
(See Functional Block Diagrams).
2002 Microchip Technology Inc.
DS21439B-page 1
©
MICROCHIP [ MICROCHIP TECHNOLOGY ]
