TC620 Datasheet, PDF (1/6 Pages) TelCom Semiconductor, Inc – 5V, DUAL TRIP POINT TEMPERATURE SENSORS

1
TC620
TC621
5V, DUAL TRIP POINT TEMPERATURE SENSORS
2
FEATURES
GENERAL DESCRIPTION
s User-Programmable Hysteresis and Temperature
Set Point
s Easily Programs with 2 External Resistors
s Wide Temperature Detection
Range ................ – 40°C to +125°C (TC620/621CVx)
s External Thermistor for Remote Sensing
Applications (TC621x)
APPLICATIONS
s Power Supply Overtemperature Detection
s Consumer Equipment
s Temperature Regulators
s CPU Thermal Protection
ORDERING INFORMATION
Part No.
Package
Ambient
Temperature
The TC620 and TC621 are programmable logic output
temperature detectors designed for use in thermal manage-
ment applications. The TC620 features an on-board tem-
perature sensor, while the TC621 connects to an external
NTC thermistor for remote sensing applications.
3 ^{Both devices feature dual thermal interrupt outputs}
(HIGH LIMIT and LOW LIMIT), each of which program 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) out-
put is driven high when temperature equals the high limit
setting, and returns low when temperature falls below the
low limit setting. This output can be used to provide simple
4 ^{ON/OFF control to a cooling fan or heater. The TC621}
provides the same output functions except that the logical
states are inverted.
The TC620/621 are usable over a maximum tempera-
ture range of – 40°C to +125°C.
TC620x*COA
TC620x*CPA
TC620x*EOA
TC620x*EPA
TC620CVOA
TC621x*COA
TC621x*CPA
8-Pin SOIC
0°C to +70°C
8-Pin Plastic DIP
0°C to +70°C
8-Pin SOIC
– 40°C to +85°C
8-Pin Plastic DIP – 40°C to +85°C
8-Pin SOIC
– 40°C to +125°C
8-Pin SOIC
0°C to +70°C
8-Pin Plastic DIP
0°C to +70°C
Part No.
TC621x*EOA
TC621x*EPA
Package
8-Pin SOIC
8-Pin Plastic DIP
Ambient
5 ^Temperature
– 40°C to +85°C
– 40°C to +85°C
*The part code will be C or H (see Functional Block Diagram, below,
and page 2).
FUNCTIONAL BLOCK DIAGRAM
Temp
to
Voltage
Converter
2
LOW SET
V_REF
GEN
TC620
+
–
V_DD
8
4
7
LOW LIMIT
1
THERMISTOR
Thermistor
Interface
Circuit
2
HIGH SET
V_REF
GEN
3
HIGH SET
V_REF
V_REF
GEN
+
6
HIGH LIMIT
–
RS
QQ
5
CONTROL*
3
LOW SET
V_REF
V_REF
GEN
*Suffix code "C" denotes cooling option (high true CONTROL output);
suffix code "H" denotes heating option (low true CONTROL output).
TELCOM SEMICONDUCTOR, INC.
TC621
V_DD
8
4
6
+
7
HIGH LIMIT
–
7
+
6
LOW LIMIT
–
RS
QQ
5
CONTROL*
8
TC620/1-9 11/4/96
2-15