TPS659037: Current monitoring using GPADC ch11

Part Number: TPS659037

Hi team,

My customer considers to use TPS659037 for powering AM5728 and provided a question.

He measured IL of SMPS12 by using internal GPADC ch11 and result was as follows.

GPADC_SW_CONV0_LSB->0x17

GPADC_SW_CONV0_MSB->0x03

Then he calculated IL in accordance with eq(1) in the datasheet with substituting following values and its result was 225mA.

・Ifs0=3.958A

・Ios0=0.652A

・K=2

・GPADC code = 0x317

Meanwhile, he measured IL of SMPS12 by using external INA260 and it showed 1073mA.

What is the cause of this contradiction?

Best regards,

Shota Mago