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AM4376: ADC1 External Hardware Trigger

Scott Morrill
Prodigy 60 points

Part Number: AM4376

For simultaneous ADC reads I thought I should link sequencer of ADC0 to ADC1.  Then use ADC1 external-hw-trigger.

I don't know this doesn't seem available, in that when trying to configure the ADC1 ext_hw_trigger it isn't available except for on ADC0 according to the pin conflict message(see below).  I've stripper down my pinmux so that neither AC25 or D24 are used anywhere and still get a pin conflict.

The AM4376 technical reference SPRUHL7H states you can trigger ADC1 with the ext_hw_trigger in section 12.3.1.2.2, assuming I'm understanding correctly.

Anyway am I on the correct path here in getting simultaneous ADC reads from my motor phase current sensors?..... If so why isn't the ext_hw_trigger supported for ADC1, or isn't as long as I have configured for ADC0 everything will be fine, and I can start ADC1 converts accordingly.  When I look at the AM437x Industrial EVM schematic it appears the ePWM3-Sync-out(AB18) is strapped to to a EXT_HW_TRIG(AC25).  

  • 0
    TI__Guru**** 393215 points
    Hi,

    The EXT_HW_TRIGGER signal is common for ADC0 and ADC1. You can disregard the pinmux error. The impotant stepsa are to configure either AC25 or D24 to EXT_HW_TRIGGER mode, and select the appropriate value in both ADC0_EVT_CAPT and ADC1_EVT_CAPT registers (sections 7.2.3.4.6 and 7.2.3.4.7 in the AM437x TRM Rev. H).