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TMP468

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SBOS762 – NOVEMBER 2016

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Copyright © 2016, Texas Instruments Incorporated

Feature Description (continued)

(1)

Resolution is 0.0625°C per count. Negative numbers are represented in two's complement format.

Table 1. Temperature Data Format (Local and Remote Temperature)

TEMPERATURE

(°C)

LOCAL OR REMOTE TEMPERATURE REGISTER VALUE

(0.0625°C RESOLUTION)

BINARY

HEX

–64

1110 0000 0000 0000

E0 00

–50

1110 0111 0000 0000

E7 00

–25

1111 0011 1000 0000

F3 80

–0.1250

1111 1111 1111 0000

FF F0

–0.0625

1111 1111 1111 1000

FF F8

0

0000 0000 0000 0000

00 00

0.0625

0000 0000 0000 1000

00 08

0.1250

0000 0000 0001 0000

00 10

0.1875

0000 0000 0001 1000

00 18

0.2500

0000 0000 0010 0000

00 20

0.3125

0000 0000 0010 1000

00 28

0.3750

0000 0000 0011 0000

00 30

0.4375

0000 0000 0011 1000

00 38

0.5000

0000 0000 0100 0000

00 40

0.5625

0000 0000 0100 1000

00 48

0.6250

0000 0000 0101 0000

00 50

0.6875

0000 0000 0101 1000

00 58

0.7500

0000 0000 0110 0000

00 60

0.8125

0000 0000 0110 1000

00 68

0.8750

0000 0000 0111 0000

00 70

0.9375

0000 0000 0111 1000

00 78

1

0000 0000 1000 0000

00 80

5

0000 0010 1000 0000

02 80

10

0000 0101 0000 0000

05 00

25

0000 1100 1000 0000

0C 80

50

0001 1001 0000 0000

19 00

75

0010 0101 1000 0000

25 80

100

0011 0010 0000 0000

32 00

125

0011 1110 1000 0000

3E 80

127

0011 1111 1000 0000

3F 80

150

0100 1011 0000 0000

4B 00

175

0101 0111 1000 0000

57 80

191

0101 1111 1000 0000

5F 80

Both local and remote temperature data use two bytes for data storage with a two's complement format for

negative numbers. The high byte stores the temperature with 2°C resolution. The second or low byte stores the

decimal fraction value of the temperature and allows a higher measurement resolution, as shown in Table 1. The

measurement resolution for both the local and the remote channels is 0.0625°C.

8.3.2 Series Resistance Cancellation

Series resistance cancellation automatically eliminates the temperature error caused by the resistance of the

routing to the remote transistor or by the resistors of the optional external low-pass filter. A total up to 1-kΩ series

resistance can be cancelled by the TMP468 device, thus eliminating the need for additional characterization and

temperature offset correction. See Figure 9 (Remote Temperature Error vs Series Resistance) for details on the

effects of series resistance on sensed remote temperature error.