AFE10004RGETEP datasheet(32/159 Pages) TI2

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6.3.4.1 LUT and ALU Organization

In the following figure, the TEMP column represents the temperature value to the LUT. This value is produced by

either the local temperature sensor, the remote temperature sensor, or provided directly by the user.

Remote

Temperature

Sensor

Local

Temperature

Sensor

TEMP

INDEX

VALUE

152

–48

K + 1

(K + 1)

BASELINE

–1

BASE

–1

–(M –

–M

–(M –

–M

Figure 6-9. LUT Organization

TEMP is truncated to a resolution of 4°C/LSB to index the LUT. The overall transfer function is stored in the LUT

as a set of unsigned 4-bit increments from the BASE value; that is, LUT location (+1) stores the value of the

increment Δ1. The baseline is set to 24°C and BASE is the numeric representation of the required output at the

BASELINE temperature.

When TEMP exceeds the BASELINE temperature, the LUT is addressed greater than the BASELINE address,

and all increments are added to the BASE value to produce DACIN, a numeric equivalent of the analog output.

When TEMP is less than the BASELINE temperature, LUT is addressed less than the BASELINE, and all

increments are subtracted from the BASE value.

The interpolation function is implemented in the ALU that follows the LUT. The truncated lower bits of the TEMP

value, REM = TEMP[5:0], are used to interpolate between data points stored in the LUT. A portion of increment,

αΔi, is added to form the final input data to the DAC. The factor α is a fraction of 4°C temperature span, or

equivalently a fraction of the 64-code temperature span, that is α = REM/64.

AFE10004-EP

SLASFM1A – JUNE 2025 – REVISED DECEMBER 2025

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