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TMP451-Q1

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SLOS877B – OCTOBER 2014 – REVISED JUNE 2019

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Copyright © 2014–2019, Texas Instruments Incorporated

Table 8. η-Factor Range (continued)

η

BINARY

HEX

DECIMAL

0000 1000

08

8

1.004152

0000 0110

06

6

1.005111

0000 0100

04

4

1.006072

0000 0010

02

2

1.007035

0000 0001

01

1

1.007517

0000 0000

00

0

1.008

1111 1111

FF

–1

1.008483

1111 1110

FE

–2

1.008967

1111 1100

FC

–4

1.009935

1111 1010

FA

–6

1.010905

1111 1000

F8

–8

1.011877

1111 0110

F6

–10

1.012851

1000 0000

80

–128

1.073837

7.6.1.8 Offset Register

The offset register allows the TMP451-Q1 device to store any system offset compensation value that might be

observed from precision calibration. The value in the register is stored in the same format as the temperature

result, and is added to the remote temperature result upon every conversion. Combined with the η-factor

correction, this function allows for very accurate system calibration over the entire temperature range.

7.6.1.9 General Call Reset

The TMP451-Q1 device supports reset using the two-wire general call address 00h (0000 0000b). The TMP451-

Q1 device acknowledges the general call address and responds to the second byte. If the second byte is 06h

(0000 0110b), the TMP451-Q1 device executes a software reset. This software reset restores the power-on reset

state to all TMP451-Q1 registers, and it aborts any conversion in progress. The TMP451-Q1 device takes no

action in response to other values in the second byte.

7.6.1.10 Identification Register

The TMP451-Q1 device allows for the two-wire bus controller to query the device for manufacturer and device

IDs to enable software identification of the device at the particular two-wire bus address. The manufacturer ID is

obtained by reading from pointer address FEh. The TMP451-Q1 device reads 55h for the manufacturer code.