eff

ADJUST

1.008

2088

2088

N

§

·

u

¨

¸

©

¹

(2)

ADJUST

eff

1.008

2088

N

2088

§

·

u

¨

¸

©

¹

(3)

The η-factor correction value must be stored in 2's complement format, yielding an effective data range from

–128 to 127. The η-factor correction value is written to and read from pointer address 23h. The register power-on

reset value is 00h, thus having no effect unless a different value is written to the register. The resolution of the

η-factor register is 0.000483.

Table 8-6. η-Factor Range

NADJUST

η

BINARY

HEX

DECIMAL

0111 1111

7F

127

0.950205

0000 1010

0A

10

1.003195

0000 1000

08

8

1.004153

0000 0110

06

6

1.005112

0000 0100

04

4

1.006073

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

1.008966

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

1.073829

8.1.10 Remote Temperature Offset Register

The offset register allows the TMP461-EP device to store any system offset compensation value that can result

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.

8.1.11 Manufacturer Identification Register

The TMP461-EP 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 the pointer address FEh. The TMP461-EP device reads 55h for the manufacturer

code.

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TMP461-EP

SNIS241 – SEPTEMBER 2025

Copyright © 2025 Texas Instruments Incorporated

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