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PDF TC622 Data sheet ( Hoja de datos )
| Número de pieza | TC622 | |
| Descripción | (TC622 / TC624) Low Cost Single Trip Point Temperature Sensor | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC622/TC624
Low Cost Single Trip Point Temperature Sensor
Features
• Temperature Set Point Easily Programs with a
Single External Resistor
• Operates with 2.7V Power Supply (TC624)
• TO-220 Package for Direct Mounting to Heatsink
(TC622XAT) or Standard 8-Pin PDIP and SOIC
Applications
• Power Supply Over-Temperature Detection
• Consumer Electronics
• Fire/ Heat Detection
• UPSs, Amplifiers, Motors
• CPU Thermal Management in PCs
General Description
The TC622 and TC624 are programmable solid-state
temperature sensors designed to replace mechanical
switches in sensing and control applications. Both
devices integrate the temperature sensor with a
voltage reference and all required detector circuitry.
The desired temperature set point is set by the user
with a single external resistor.
Ambient temperature is sensed and compared to the
programmed set point. The OUT and OUT outputs are
driven to their active state when the measured
temperature exceeds the programmed set point.
The TC622 has a power supply voltage range of 4.5V
to 18.0V while the TC624 operates over a power supply
range of 2.7V to 4.5V. Both devices are usable over a
temperature range of -40°C to +125°C (TC622VXX,
TC624VXX). Both devices feature low supply current
making them suitable for portable applications.
Eight-pin through-hole and surface mount packages
are available. The TC622 is also offered in a 5-pin
TO-220 package.
The TC622 and TC624 are single point temperature
detectors ideal for use in a wide variety of applications.
Device Selection Table
Part Number
Voltage Operation
TC622COA
TC622CPA
TC622EAT
TC622EOA
TC622EPA
TC622VAT
TC622VOA
TC622VPA
TC624COA
TC624CPA
TC624EOA
TC624EPA
TC624VOA
TC624VPA
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
Package
8-Pin SOIC
8-Pin PDIP
5-Pin TO-220
8-Pin SOIC
8-Pin PDIP
5-Pin TO-220
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
Ambient Temperature
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°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
-40°C to +125°C
-40°C to +125°
© 2002 Microchip Technology Inc.
DS21440B-page 1
1 page  
3.0 DETAILED DESCRIPTION
3.1 Trip Point Programming
When the temperature of the device exceeds the pro-
grammed temperature trip point, TSET, the OUT and
OUT outputs are driven into their active states. The
desired trip point temperature is programmed with a
single external resistor connected between the TSET
input and VCC. The relationship between the resistor
value and the trip point temperature is given by
Equation 3-1.
EQUATION 3-1:
RTRIP = 0.5997 x T 2.1312
Where:
RTRIP = Programming resistor value in Ohms
T = Desired trip temperature in degrees Kelvin.
For example, as shown in Figure 3-1, to program the
device to trip at 50°C, the programming resistor is:
RTRIP = 0.5997 x ((50 + 273.15)2.1312) = 133.65kΩ
FIGURE 3-1:
250
PROGRAMMING
RESISTOR VALUES VS.
TEMPERATURE
200
150
100
50
-55 -35 -15
5 25 45 65
TEMPERATURE (˚C)
85 105 125
TC622/TC624
3.2 Hysteresis
To prevent output “chattering” at the trip point tempera-
ture, the temperature detector in the TC622/TC624 has
2°C hysteresis (see Figure 3-2). The outputs are driven
active when the temperature crosses the set point
determined by the external resistor. As temperature
declines below the set point, the hysteresis action will
hold the outputs true until the temperature drops 2°C
below the threshold.
FIGURE 3-2:
TC622/TC624
HYSTERESIS
Temperature
Set Point
(Set Point – 2 Degrees C)
OUT
OUT
© 2002 Microchip Technology Inc.
DS21440B-page 5
5 Page 
TC622/TC624
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
© 2002 Microchip Technology Inc.
DS21440B-page 9
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC622.PDF ] | |
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