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PDF TC621 Data sheet ( Hoja de datos )
| Número de pieza | TC621 | |
| Descripción | (TC620 / TC621) Dual Trip Point Temperature Sensors | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC621 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
• User Programmable Hysteresis and
Temperature Set Point
• Easily Programs with Two 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)
• Onboard Temperature Sensing Applications
(TC620X)
• External NTC Thermistor for Remote Sensing
Applications (TC621X)
• Available in 8-Pin PDIP and SOIC Packages
Applications
• Power Supply Over Temperature Detection
• Consumer Equipment
• Temperature Regulators
• CPU Thermal Protection
Device Selection Table
Part Number
Package
Temperature
Range
TC620X*COA
TC620X*CPA
TC620X*EOA
TC620X*EPA
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
TC620C*VOA
TC621X*COA
TC621X*CPA
TC621X*EOA
TC621X*EPA
TC621C*VOA
8-Pin SOIC
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
-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
Note: *The part code will be C or H (see
Functional Block Diagrams).
Package Type
8-PDIP
NC 1
LOW SET 2 TC620XCPA
HIGH SET 3 TC620XEPA
GND 4
8 VDD
7 HIGH LIMIT
6 LOW LIMIT
5 CONTROL
8-PDIP
THERMISTOR 1
HIGH SET 2
LOW SET 3
GND 4
TC621XCPA
TC621XEPA
8 VDD
7 HIGH LIMIT
6 LOW LIMIT
5 CONTROL
8-SOIC
NC 1
LOW SET 2
HIGH SET 3
GND 4
8 VDD
TC620XCOA 7 LOW LIMIT
TC620XEOA 6 HIGH LIMIT
TC620CVOA 5 CONTROL
8-SOIC
THERMISTOR 1
HIGH SET 2
LOW SET 3
GND 4
8 VDD
TC621XCOA 7 HIGH LIMIT
TC621XEOA 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.
2001-2015 Microchip Technology Inc.
DS20001439E-page 1
1 page  
3.0 DETAILED DESCRIPTION
The TC620 has a positive temperature coefficient tem-
perature sensor and a dual threshold detector. Tem-
perature set point programming is accomplished with
external resistors from the HIGH SET and LOW SET
inputs to VDD. The HIGH LIMIT and LOW LIMIT outputs
remain low as long as measured temperature is below
set point values. As measured temperature increases,
the LOW LIMIT output is driven high when temperature
equals the LOW SET set point (±3°C max). If tempera-
ture continues to climb, the HIGH LIMIT output is driven
high when temperature equals the HIGH SET set point
(Figure 3-1). The CONTROL (hysteresis) output is
latched in its active state at the temperature specified
by the HIGH SET resistor. CONTROL is maintained
active until temperature falls to the value specified by
the LOW SET resistor.
High Set Point
Low Set Point
Low Limit Output
High Limit Output
Control Output (Cool Option
Control Output (Heat Option)
Temperature
FIGURE 3-1:
Output Logic.
TC620/TC621 Input vs.
3.1 Programming the TC620
The resistor values to achieve the desired trip point
temperatures on HIGH SET and LOW SET are
calculated using Equation 3-1:
EQUATION 3-1:
Where:
RTRIP = 0.5997 x T 2.1312
RTRIP = Programming resistor in Ohms
T = The desired trip point temperature in degrees
Kelvin.
For example, a 50°C setting on either the HIGH SET
or LOW SET input is calculated using Equation 3-2 as
follows:
EQUATION 3-2:
RSET = 0.5997 x ((50 + 273.15)2.1312) = 133.6 k
Care must be taken to ensure the LOW SET program-
ming resistor is a smaller value than the HIGH SET
programming resistor. Failure to do this will result in
erroneous operation of the CONTROL output.
TC620/TC621
Care must also be taken to ensure the LOW SET
temperature setting is at least 5°C lower than the HIGH
SET temperature setting.
Figure 3-2 can help the user obtain an estimate of the
external resistor values required for the desired LOW
SET and HIGH SET trip points.
250
200
150
100
50
-55 -35 -15
5 25 45 65
TEMPERATURE (°C)
85 105 125
FIGURE 3-2:
TC620 Sense Resistors vs.
Trip Temperature.
3.2 Built-in Hysteresis
To prevent output “chattering” when measured
temperature is at (or near) the programmed trip point
values, the LOW SET and HIGH SET inputs each have
built-in hysteresis of -2°C below the programmed
settings (Figure 3-3).
Set Point
(Set Point 2°C)
High Limit
or Low Limit
Output
FIGURE 3-3:
Built-In Hysteresis on Low
Limit and High Limit Outputs.
As shown, the outputs remain in their active state
(hysteresis) until temperature falls an additional 2°C
below the user’s setting.
2001-2015 Microchip Technology Inc.
DS20001439E-page 5
5 Page 
TC620/TC621
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2001-2015 Microchip Technology Inc.
DS20001439E-page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TC621.PDF ] | |
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