TC623HCPA 查看數據表（PDF） - TelCom Semiconductor Inc => Microchip

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TC623HCPA

3V, DUAL TRIP POINT TEMPERATURE SENSOR

TelCom Semiconductor Inc => Microchip 

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.

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