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ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104

Part Number TMP7

Copyright © 2014 ABCircuits. Revised September 2014 Page 5 of 10

Pin Description

Pin #

Description

Pin #

Description

1

FARH

28

VDD

2

SEG3B

27

POL

3

MIN-

26

SCALE

4

MAX-

25

SOUT-

5

SEG3C

24

TEMP

6

SEGLF

23

SEGLG

7

SEGLD

22

SEGLE

8

SEGLB

21

SEGLC

9

NC

20

SEGLA

10

SEG3G

19

NC

11

SEGRF

18

SEGRG

12

SEGRD

17

SEGRE

13

SEGRB

16

SEGRC

14

VSS

15

SEGRA

POL

Polarity input. If this pin is open or high, the “on” segments will have a high level on the SEG

outputs of the chip. If this pin is low or grounded “on” segments will output as a low on the SEG

pins. This pin is read once at power up and has a built in pull up resistor.

TEMP

This is the analog input for the temperature. A 10K precision resistor and a 10K NTC thermister

are connected to this input for temperature measurement. The thermister should have a B25/B5

ratio of 3977K. These thermisters are available from Murata, Vishay, US Sensor, and other

companies. This input is a sensitive analog input and should be protected from noise.

This input may also be connected to any analog device with an output of 0 to VCC volts. In this

case, the input must be protected from voltages greater than VCC or lower than ground.

MIN-

This optional input displays the lowest temperature since power was applied. If both MIN- and

MAX- are low, the minimum temperature is reset to the current temperature. This input has a

built in pull up resistor. This input has no effect on the serial output.

MAX-

This optional input displays the highest temperature since power was applied. If both MIN- and

MAX- are low, the maximum temperature is reset to the current temperature. This input has a

built in pull up resistor. This input has no effect on the serial output.

SCALE and FARH

These two inputs select the scale to be used, degrees C, degrees F, Percentage, or Raw data.

These inputs have a built in pull up resistors. These inputs are read before every display update

and serial output.