RM57 ADC1 Channel 31

Dmitri Zakharevski59

I am having some issues reading ADCIN[31].

According to 6.5.13 and 6.5 PINMMR174[24] should be Temperature Sensor Power Down Enable.
pinMuxReg->PINMUX[174] |= (uint32)(~(0XFEFFFFFFU)); Specifies

However ADCIN[31] cannot read a value unless the Temperature Sensor is Powered up:
pinMuxReg->PINMUX[174] &= (uint32)(0XFEFFFFFFU);

I didnt find any documentation around having to clear PINMMR174[24] to read ADCIN[31].

Does the Temperature Sensor Power need to be enabled to (PINMMR174[24] set) to read ADCIN[31]?

Thanks

over 9 years ago

0 Anthony F. Seely over 9 years ago

TI__Guru 68920 points

Dmitri,

Yes this is a silicon issue - One of my colleagues Charles Tsai confirmed it roughly 1 month ago.
It should appear in an errata update soon.

His analysis "The temp sensor needs to be enabled (but not selected) to use AD1IN[31]. ."

0 Dmitri Zakharevski59 over 9 years ago in reply to Anthony F. Seely

Intellectual 905 points

This answers my question thank you. When do you expect the Errata update? Is it possible to get an early draft?

0 Anthony F. Seely over 9 years ago in reply to Dmitri Zakharevski59

TI__Guru 68920 points

Bob Crosby or Charles Tsai , could either of you please help Dmitri w. date for the errata or possibly a preliminary draft.

Dimitri, in any case I think the issue is as simple as you've found... just enable the temp sensor.

0 Anthony F. Seely over 9 years ago in reply to Anthony F. Seely

TI__Guru 68920 points

Dmitri,

Talked to Bob and Charles. For this issue the isn't going to be an errata instead they are updating the TRM

chapter - draft is below:

Seeing this in print? We're supposed to update the TRM chapters every 6 months (publish .. the above correction is already in the TRM sources but it's not in a published version just an internal version..) but we're running behind and have quite a backlog so I can't really give you a date.

0 Dmitri Zakharevski59 over 9 years ago in reply to Anthony F. Seely

Intellectual 905 points

Thanks Anthony.

I'll make sure our internal docs are updated when the new Technical Reference comes out.

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RM57 ADC1 Channel 31