Details, datasheet, quote on part number: TC621HEPA
PartTC621HEPA
CategorySensors
Description5v, Dual Trip Point Temperature Sensors
CompanyTelCom Semiconductor
DatasheetDownload TC621HEPA datasheet
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Features, Applications
FEATURES

User-Programmable Hysteresis and Temperature Set Point Easily Programs with 2 External Resistors Wide Temperature Detection Range................ +125C (TC620/621CVx) External Thermistor for Remote Sensing Applications (TC621x)

The TC620 and TC621 are programmable logic output temperature detectors designed for use in thermal management applications. The TC620 features an on-board 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 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) output 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 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 temperature range to +125C. Ambient Temperature to +85C

APPLICATIONS

Power Supply Overtemperature Detection Consumer Equipment Temperature Regulators CPU Thermal Protection

8-Pin SOIC +70C 8-Pin Plastic DIP +70C 8-Pin SOIC +85C 8-Pin Plastic DIP +85C 8-Pin SOIC +125C 8-Pin SOIC +70C 8-Pin Plastic DIP to +70C

*The part code will or H (see Functional Block Diagram, below, and page 2).
VDD 8 Temp to Voltage Converter 1 Thermistor Interface Circuit 8 VDD

*Suffix code "C" denotes cooling option (high true CONTROL output); suffix code "H" denotes heating option (low true CONTROL output).

Package Power Dissipation (TA 70C) PDIP............................................................... 730mW SOIC............................................................... 470mW Derating Factors Plastic............................................................8mW/C Supply Voltage............................................................20V Input Voltage Any Input....... (GND 0.3V) to (VDD +0.3V) Operating Temperature M Version....................................... +125C V Version........................................ +125C E Version.......................................... +85C C Version............................................... to +70C Maximum Chip Temperature................................. +150C Storage Temperature............................ to +150C Lead Temperature (Soldering, 10 sec)................. +300C

*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 permanent 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.

Supply Voltage Range Supply Current Output Resistance Output Current Output Current Absolute Accuracy

5V VDD 18V Output High or Low, 5V VDD 18V Temp Sensed Source/Sink Cool/Heat Source/Sink T = Programmed Temperature

The TC620/621 consists of a positive temperature coefficient (PTC) temperature sensor, and a dual threshold detector. Temperature setpoint programming is easily accomplished with external programming 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 setpoint values. As measured temperature increases, the LOW LIMIT output is driven high when temperature equals the LOW SET setpoint (3C max). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH SET setpoint (Figure 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. Care must be taken to ensure the LOW SET programming resistor is a smaller value than the HIGH SET programming resistor. Failure to do this will result in erroneous operation of the CONTROL output. Care must also be taken to ensure the LOW SET temperature setting is at least 5C lower than the HIGH SET temperature setting. That is: LOW SET HIGH SET 5C The nomograph of Figure 2 can help the user obtain an estimate of the external resistor values required for the desired LOW SET and HIGH SET trip points.

HIGH SET POINT TEMPERATURE LOW SET POINT LOW LIMIT OUTPUT HIGH LIMIT OUTPUT CONTROL OUTPUT (COOL OPTION) CONTROL OUTPUT (HEAT OPTION)

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 2C below the programmed settings (Figure 3).

The resistor values to achieve the desired trip-point temperatures on HIGH SET and LOW SET are calculated using EQUATION 1 below: RTRIP T 2.1312 Where: Rtrip = Programming resistor in Ohms T = The desired trip point temperature in degrees Kelvin

For example, a 50C setting on either the HIGH SET or LOW SET input is calculated using Equation 1 as follows: Rset x 133.6k

Figure 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 2C below the user's setting.


 

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