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About TPS65950, How to use MADC useing setting?



Hi

I have question for MADC useing resister setting.

We want to use  MADC 6 ch  as normal ADC.

But we connected  divider Voltage just 1V, but  ADC result was 0.28V.

We already know about   "Table9-4 MADC Channel Prescaler Divide Ratio".

But we can not measure Voltage as normal ADC.

We setting

   15.4.11.1 MADC Monitoring Using MCPC Pins as ADCIN3~6

  CARKIT_ANA_CTRL[3] SEL_MADC_MCPC bit    =>   1

but , this resister ,we can write normal when connected USB, but we could ' t write

this resister without  USB connect.

If ADCin 6ch Voltage measure is correct value value, but not connect USB ADCin 6ch

measure Voltage is not correct.

Question

 Dose we need other resister setting? 

  "CARKIT_ANA_CTRL[3] SEL_MADC_MCPC bit    =>   1  " only is not enough?

Could you give us Idea?

Regard

  Jasper