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TC623 Datasheet Preview

TC623 Datasheet

DUAL TRIP POINT TEMPERATURE SENSOR

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1
TC623
3V, DUAL TRIP POINT TEMPERATURE SENSOR
FEATURES
s Integrated Temp Sensor and Detector Operate
from a Supply Voltage as Low as 2.7V
s Replaces Mechanical Thermostats and Switches
s On-Chip Temperature Sense
s 8-Pin DIP or SOIC for Direct PCB Mounting
s 2 User-Programmable Temperature Set Points
s 2 Independent Temperature Limit Outputs
s Heat/Cool Regulate Output
APPLICATIONS
s CPU Thermal Management
s System Over-or Under-Temperature Shutdown
s Advanced Thermal Warning
s Fan Speed Control Circuits
s Accurate Appliance Temperature Sensing
s Environmental Control
FUNCTIONAL BLOCK DIAGRAM
1
NC
2
LOW SET
TEMP
TO
VOLTAGE
CONVERTER
VREF
GEN.
TC623
+
VREF
3
HIGH SET
VREF
GEN.
+
8
VCC
7
LOW LIMIT
6
HIGH LIMIT
GENERAL DESCRIPTION
The TC623 is a 3V solid-state, programmable tempera-
ture sensor designed for use in thermal management appli-
cations. It features dual thermal interrupt outputs (LOW
LIMIT and HIGH LIMIT) each of which program with a single
external resistor. The HIGH LIMIT and LOW LIMIT outputs
are driven active (high) when measured temperature equals
the user-programmed limits. The CONTROL output is driven
active (high) when temperature equals the HIGH LIMIT
setpoint, and turned off when temperature falls below the
LOW LIMIT setpoint. The CONTROL output can be used to
provide simple ON/OFF control to a cooling fan if so desired.
Low voltage operation, easy setpoint programming,
small size and low cost make the TC623 an ideal choice for
many thermal management applications.
ORDERING INFORMATION
Part No.
Package
Temperature
Range
TC623CCOA
TC623CCPA
TC623CEOA
TC623CEPA
TC623CVOA
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
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
NOTE: Latch Q Output, ("C" Option), is a Standard Device. Contact
Factory for Latch Q Output, ("H" Option).
PIN CONFIGURATION (DIP and SOIC)
NC
LOW SET
HIGH SET
GND
1
2
3
4
TC623CCOA
TC623CEOA
TC623CVOA
8
7
6
5
VCC
LOW LIMIT
HIGH LIMIT
CONTROL
2
3
4
5
6
7
4
GND
RS
Q
LATCH
5
CONTROL
RLOW < RHIGH
NC 1
LOW SET 2
HIGH SET 3
GND 4
TC623CCPA
TC623CEPA
8 VCC
7 LOW LIMIT
6 HIGH LIMIT
5 CONTROL
8
TELCOM SEMICONDUCTOR, INC.
TC623-5 9/18/96
2-25




TelCom Semiconductor

TC623 Datasheet Preview

TC623 Datasheet

DUAL TRIP POINT TEMPERATURE SENSOR

No Preview Available !

3V, DUAL TRIP POINT
TEMPERATURE SENSOR
TC623
ABSOLUTE MAXIMUM RATINGS*
Package Power Dissipation (TA 70°C)
Plastic DIP ......................................................730mW
SOIC ............................................................... 470mW
Derating Factors
Plastic DIP .................................................... 8mW/°C
SOIC ............................................................. 6mW/°C
Supply Voltage ...........................................................5.5V
Input Voltage Any Input ....... (GND – 0.3V) to (VDD +0.3V)
Operating Temperature
V Version ........................................ – 40°C to +125°C
E Version .......................................... – 40°C to +85°C
C Version ............................................... 0°C to +70°C
Maximum Chip Temperature ................................. +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under "Absolute Maximum Ratings" may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above those
indicated in the operation sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
ELECTRICAL CHARACTERISTICS Over Operating Temperature Range) VDD = 2.7V to 4.5V, unless otherwise specified.
Parameter
Supply Voltage Range
Supply Current
Absolute Accuracy
VOH
VOL
Hysteresis
* Measured at 25°C
Conditions
2.7V VDD 4.5V
T = Programmed Temperature
IOH = 250µA
IOH = 500µA
IOL = 500µA
IOL = 1mA
Falling Temperature
250
200
150
100
50
-55 -35 -15
5 25 45 65
TEMPERATURE (°C)
85 105 125
Min
2.7
T–3
0.9 x VDD
0.8 x VDD
Typ*
150
T ±1
Max
4.5
250
T +3
0.1 x VDD
0.2 x VDD
–2
Unit
V
µA
°C
V
V
V
V
°C
creases, the LOW LIMIT is driven high when temperature
equals the LOW LIMIT setpoint (±3°C). If temperature
continues to climb, the HIGH LIMIT output is driven high
when temperature equals the HIGH LIMIT setpoint (±3°C).
Figure 1 shows the relationship between the sense resis-
tance values and trip point temperature.
The CONTROL output is driven high when the HIGH
LIMIT output goes high, and is reset low when the LOW
LIMIT output goes low. This output provides the logic for
simple ON/OFF fan control. Figure 2 shows overall TC623
operation.
Figure 1. TC623 Sense Resistors vs. Trip Temperature
DETAILED DESCRIPTION
TC623 Operation
The TC623 consists of a positive temperature coeffi-
cient (PTC) temperature sensor and dual threshold detec-
tor. Temperature set point programming is easily accom-
plished with external programming resistors from the HIGH
SET and LOW SET inputs to VCC. The HIGH LIMIT and LOW
LIMIT outputs remain inactive (low) as long as the measured
temperature is below setpoint values. As temperature in-
HIGH SET POINT
LOW SET POINT
LOW LIMIT OUTPUT
HIGH LIMIT OUTPUT
CONTROL OUTPUT (COOL OPTION)
TEMPERATURE
Figure 2. TC623 Temperature vs. Output
2-26 TELCOM SEMICONDUCTOR, INC.


Part Number TC623
Description DUAL TRIP POINT TEMPERATURE SENSOR
Maker TelCom Semiconductor
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TC623 Datasheet PDF






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