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Original question:

PCM6340-Q1: Unused GPIO1 to 3

PCM6340-Q1: DYN_CH_PUPD_EN

Shinji Tsuji
Genius 12338 points
Part Number: PCM6340-Q1

Hi team,

Dynamic channel pupd enable feature prohibit power down Channel 1 as below.

"1d = Channel can be powered up or down individually, even if channel
recording is on. Do not powered-down channel 1 if this bit is set to '1'"

But from the DYN_MAXCH_SEL[1:0] register description below, Channel 1 and Channel 2 seems to be power down dynamically.

Is my understanding wrong?

"Dynamic mode maximum channel select configuration.
0d = Channel 1 and channel 2 are used with dynamic channel power-up,
power-down feature enabled"

regards,

  • 0
    TI__Mastermind 23050 points

    Hi Tsuji-san,

    I apologize for the delay on this one, I wanted to confirm this operation with the team first.

    So when dynamic power-up and power-down is enabled this means channels can be powered-up/down independently when other channels are still powered-ON. However, there is an internal limitation that stops channel 1 from being able to be independently powered off if other channels are still powered on. It can still be powered down if all other channels are also powered down, but if it is required to have only a single channel powered on, then it must be channel 1. 

    Also the DYN_MAXCH_SEL configuration bits need to be configured before power-up of ADC (using page-0, register-117) to guide the device about what all channels will be turned-ON simultaneously when dynamic power-up and power-down feature is enabled.

    I hope this is clear!

    Best,

    Zak

     

  • 0 in reply to Zak Kaye
    TI__Genius 12338 points

    Hi Zak,

    Let me explain in other words. Please correct me if I'm wrong.

    1. Channel 1 must be powered on if at least one of other channels are powered on.

    2. individual channel power up/down is controlled by IN_CH_EN?

    3. DYN_MAXCH_SEL determines the maximum number of channels supported for dynamic power up / down.

    If this bit is set to 0d ( Channel 1 and 2) for PCM6240(4ch), then only Channel 2 can be individually power up or down, correct?

    Is it OK to select 2d for PCM6240(4ch version)?

    regards,

  • 0 in reply to Shinji Tsuji
    TI__Mastermind 23050 points

    Hi Tsuji-san,

    Your understanding is correct. Yes, channels 5 and 6 are always powered down for 4-channel variants so there should be no problem writing 2d to PCM6240 version.

    Best,

    Zak