UCD3138128: About ADC15 set

Parrish Huang

Part Number: UCD3138128
Other Parts Discussed in Thread: UCD3138, , UCD3138OL64EVM-031

Tool/software:

Dear TI Experts,

Reference documents: https://www.ti.com/cn/lit/an/zhca494/zhca494.pdf?ts=1733797858080

In the document, on page 7, title 2, it mentions "ADC15 set to read the AFE0 EAP pin voltage."
I checked the UCD3138 chip's registers, and this function exists and works as expected.

    AdcRegs.ADCSEQSEL1.bit.SEQ6 = 15;       

    MiscAnalogRegs.AFECTRL.bit.AFE_MUX_SEL = 3;   
    MiscAnalogRegs.AFECTRL.bit.AFE_VIN_MUX = 0;   
    MiscAnalogRegs.AFECTRL.bit.AFE_MUX_CH_SEL = 1;

However, I want to implement this on the UCD3138128, but the UCD3138128 registers don’t have the same register name.
Does this mean the function is not available on the UCD3138128?

6 months ago

0 Hemanth Sreeperumbudur 6 months ago

TI__Intellectual 2400 points

Hi Parrish,

Can you help with full part number where the ADC15 was used and working?

Regards
Hemanth

0 Parrish Huang 6 months ago in reply to Hemanth Sreeperumbudur

Prodigy 110 points

Dear Hemanth,

Reference documents: https://www.ti.com/cn/lit/an/zhca494/zhca494.pdf?ts=1733797858080

I found this function in the document. Later, I tested it on the UCD3138OL64EVM-031 board, and it worked by simply configuring these parameters to read the EAP pin voltage.

    AdcRegs.ADCSEQSEL1.bit.SEQ6 = 15;       

    MiscAnalogRegs.AFECTRL.bit.AFE_MUX_SEL = 3;   
    MiscAnalogRegs.AFECTRL.bit.AFE_VIN_MUX = 0;   
    MiscAnalogRegs.AFECTRL.bit.AFE_MUX_CH_SEL = 1;

However, it is not usable on the powered-up board, as the ADC readings do not match the values read from the EADC ABS_VALUE.

+1 Hemanth Sreeperumbudur 6 months ago in reply to Parrish Huang

TI__Intellectual 2400 points

Hi Parrish,

Thanks for clarification.

I am unable to locate the details of ADC15 with the current variant part UCD3138128. I would assume, it is no longer supported for use by customer.

Regards

Hemanth

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UCD3138128: About ADC15 set