TC07VUA データシートの表示（PDF） - TelCom Semiconductor Inc => Microchip

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TC07VUA

3V LOGIC OUTPUT TEMPERATURE SENSOR WITH PROGRAMMABLE HYSTERESIS

TelCom Semiconductor Inc => Microchip 

TC07

3V LOGIC OUTPUT TEMPERATURE

SENSOR WITH PROGRAMMABLE

HYSTERESIS

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage ..............................................................7V

Input Voltage Any Input ...... (GND – 0.3V) to (VDD + 0.3V)

Operating Temperature ......................... – 40°C to +125°C

Maximum Chip Temperature ................................. +150°C

Storage Temperature ............................ – 65°C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300°C

* 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.

ELECTRICAL CHARACTERISTICS: TA = Over Operational Temperature Range, unless otherwise specified.

Symbol

VDD

IDD

VOH

VOL

H

TSET

HSET

Parameter

Supply Voltage Range

Supply Current

Output Voltage (High)

Output Voltage (Low)

Minimum Hysteresis

Absolute Accuracy

Absolute Accuracy

Conditions

2.7V < VCC < 5.5V

IOUT = 500µA

IOUT = 1mA

HSET < TSET

T = Programmed Temperature

T = Programmed Temperature

Min

2.7

—

0.8 x VDD

—

–5

T–3

T–5

Typ

—

130

—

—

—

T±1

T±1

Max

5.5

300

—

0.25 x VDD

—

T+3

T+5

Unit

V

µA

V

V

°C

°C

°C

DETAILED DESCRIPTION

The TC07 programs with resistors connected from the

TSET and HSET inputs to VDD. Output pins OUT and OUT are

driven active when temperature exceeds the setting deter-

mined by the programming resistor on TSET. The outputs are

maintained (latched) in their active states until temperature

drops below the setting determined by the programming

resistor on HSET (Figure 1).

APPLICATIONS

Trip Point Programming

The resistor values required to achieve the desired

trip-point temperatures on TSET and HSET are calculated

using the formula below:

RTRIP = 0.6 x T 2.13

TEMPERATURE SET BY

RESISTOR ON TSET

HYSTERESIS SET BY

RESISTOR ON HSET

TEMPERATURE

Where:

RTRIP

T

= Programming resistor value in Ohms

= Desired trip point temperature in degrees

Kelvin.

For example, to program the TC07 outputs to go active

at 50°C and inactive at 30°C, the TSET and HSET program-

ming resistors are calculated as follows:

OUT

TSET = 0.6 x ((50 + 273.15)2.13) = 132.8kΩ

HSET = 0.6 x ((30 + 273.15)2.13) = 115.9kΩ

OUT

2-12

Figure 1. TC07 Output Waveforms

Resistance values for TSET and HSET can be approxi-

mated using Figure 2. Care must be taken to ensure the

HSET programming resistor is a smaller value than the TSET

programming resistor. The temperature programmed on

HSET must be at least 5°C lower than the temperature value

programmed by TSET. That is: HSET ≤ TSET – 5°C.

TELCOM SEMICONDUCTOR, INC.

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