TMP451 datasheet(27/42 Pages) TI2

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ADJUST

eff

1.008

2088

eff

ADJUST

1.008

2088

BE2

BE1

hkT

TMP451

www.ti.com

SBOS686A – JUNE 2013 – REVISED DECEMBER 2014

The TMP451 device allows for a different

η-factor value to be used for converting remote channel measurements

to temperature. The remote channel uses sequential current excitation to extract a differential VBE voltage

measurement to determine the temperature of the remote transistor. Equation 1 shows this voltage and

temperature.

(1)

The value

η in Equation 1 is a characteristic of the particular transistor used for the remote channel. The power-

on reset value for the TMP451 device is

η = 1.008. The value in the η-factor correction register may be used to

adjust the effective

η-factor according to Equation 2 and Equation 3.

(2)

(3)

The

η-factor correction value must be stored in twos 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 it.

Table 27.

η-Factor Range

NADJUST

BINARY

HEX

DECIMAL

0111 1111

127

0.950198

0000 1010

1.003195

0000 1000

1.004152

0000 0110

1.005111

0000 0100

1.006072

0000 0010

1.007035

0000 0001

1.007517

0000 0000

1.008

1111 1111

–1

1.008483

1111 1110

–2

1.008967

1111 1100

–4

1.009935

1111 1010

–6

1.010905

1111 1000

–8

1.011877

1111 0110

–10

1.012851

1000 0000

–128

1.073837

7.6.1.24 Digital Filter Control Register (offset: Read = 24h; Write = 24h) [reset = 00h]

Figure 39. Digital Filter Control Register

RESERVED

DF1

DF0

R/W-0h

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 28. Digital Filter Control Register Field Descriptions

Bit

Field

Type

Reset

Description

1 - 0

DF1 - DF0

R/W

Configures the amount of filtering for the remote temperature

results. Refer toTable 29

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