AFE10004RGETEP datasheet(43/159 Pages) TI2

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6.4 Device Functional Modes

The simplified numeric signal path for a DAC and CLAMP channels is shown in Figure 6-16. The temperature

sensor serves as the input to the system. Signal processing is done by the LUT and ALU, and the output is

driven to the DAC. The CLAMP input code upper eight bits (CLAMP[12:5]) are automatically controlled so that

these bits never exceed the upper eight bits of the code being input to the associated DACs (CLAMP1: DAC[0:1]

and CLAMP2: DAC[2:3]). The DAC and CLAMP details are omitted because the DAC and CLAMP provide a

conversion from numeric domain to voltage domain only, and do not affect the signal flow.

LUT1

DACxPOL

ALU

[12:6]

[5:0]

LUTSELx

0 S

LT[11:0]

DACxLUT[12:0]

Remot e

Temp. Sensor

Local

Temp. Sensor

RT[11:0]

TMPOW

0 S

TMPOW[11:0]

BYPx

DACxOW[12:0]

DACxOW

DACx_BASE[12:0]

DACx

DACx[12:0]

CLMxOW[12:0]

CLAMPx

CLMx[12:0]

CLMxOW[12:5]

CLMxOW[4:0]

min

Figure 6-16. Data Path

6.4.1 Autonomous Operating Mode

Unless a different configuration has been burned in the EEPROM, autonomous operation is active upon start-up.

By default, the temperature sensor is active (TMPSD = 0) and the LUT and both temperature sensors are

enabled (LUTDIS = 0, REN = 1 and LEN = 1). Also by default, the temperature overwrite (TMPOW) and DAC

overwrite (DACxOW) bits are cleared.

In autonomous mode, the device begins temperature measurements at start-up. Each temperature sensor

update triggers the ALU to recalculate the output using the user-defined coefficients, polarity, and BASE value

stored in the LUT pages. The ALU output is passed on to the DAC LUT register that ultimately drives the DAC

input.

The device remains in autonomous operation unless the data path is overwritten, the LUT is disabled (LUTDIS =

1), or the temperature sensor is powered down (TMPSD = 1). If the LUT is disabled or the temperature sensor

is powered down, the DAC output remains at the last calculated value. The device automatically returns to

autonomous operation after being reconfigured properly.

6.4.2 Manual Operating Mode

There are a number of multiplexers in the signal path that alter the data flow when the respective control bits are

set. The multiplexer states that set the various modes of manual operation are described in further detail in the

following subsections.

6.4.2.1 DAC Input Overwrite

The DAC inputs words can be directly written through the serial interface. In this mode, the device operates

as a multichannel, 13-bit DAC. This functionality is facilitated by the multiplexers that precede the DACs, and

user-writable DAC overwrite data registers (DACxOW[12:0]). The multiplexer control signal is the DAC overwrite

bit (DACxOW). Although not required by the device, set the LUTDIS bit to optionally disable the LUT and ALU.

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AFE10004-EP

SLASFM1A – JUNE 2025 – REVISED DECEMBER 2025

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