Gain configuration in nafe73388

[Radhakrishnan]

We are currently working with the NAFE73388 device and facing issues while configuring the Programmable Gain Amplifier (PGA).

We request your support on the following:

Unable to Set Gain Above 1 V/V

We are not able to configure the gain above 1 V/V. Any attempt to increase the gain does not reflect in the output. Kindly advise possible causes and checks.

Registers for 16 V/V Gain Configuration

Please confirm:

Which register(s) control the PGA gain?

Which specific bit fields must be

configured to enable 16 V/V gain?

Required Register Values for 16 V/V Gain

Kindly provide:

Exact register addresses

Bit positions

Required hex values

Any sequencing requirements (power-up, channel enable, calibration, etc.)

Additionally, please let us know if:

Any specific operating mode must be enabled before selecting higher gain

There are input range limitations or reference configuration dependencies 

Calibration is mandatory after changing gain

Looking forward to your guidance.

[ErikaC]

Are you using the evaluation board? Have you tried modifying the registers first through our GUI? If not, which MCU are you using?

Have you reviewed the application note AN14103 , which describes the recommended initialization flow, channel configuration steps, and the correct sequence for applying gain, calibration, and offset coefficients for the NAFE device family? The document also explains how the device handles channel‑based configuration registers, how to correctly write to the coefficient registers, and the proper order of enabling the analog front end to ensure that gain settings are applied correctly and that no steps are skipped during startup.