• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 48 subscribers
  • Views 278 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS8568: The Configuration (CONFIG) Register cannot be read.

shinoda hiroki
Prodigy 10 points

Part Number: ADS8568

Tool/software:

I have read the following questions but they do not solve my problem.

ADS8568: Can't get the configuration register to output when enabling the read-out access register - Data converters forum - Data converters - TI E2E support forums

Using software mode(HW/SW pin is '1'.), serial interface(PAR/SER pin is '1'.).　The read data is all '0'.

Please let me know about the following questions:

1) The question above mentions CONVST_x, but do I need to drive CONVST_x to a high level to read the Configuration (CONFIG) Register?
    As a test, I drove CONVST_x to a high level in sync with reading the Configuration (CONFIG) Register.
    Data was output from SDO_A, but I believe this was AD converted data.

2) To read the Configuration (CONFIG) Register, bit 30 (READ_EN) must be set to '1', but at this time, does bit 31 (WRITE_EN) also need to be set to '1'?

3) The description of bit 30 (READ_EN) of the Configuration (CONFIG) Register states "Configuration register contents output on SDO_A with next two accesses," so I am issuing three read accesses via the serial interface. Is it necessary to set bit 30 (READ_EN) to '1' for all three read accesses?

Regards

  • +1
    TI__Expert 7940 points

    Hello Hiroki-san, 

    To answer your questions:

    1. Yes, CONVST_x should be used to activate a conversion, in that frame, the CONFIG register READ_EN should be set to 1 to enable register read out. Then 2 additional accesses/frames to see the CONFIG register read out. 
    2. Yes, to WRITE_EN (Bit 31) and READ_EN (bit 30) both need to be set to 1. Setting bit 31 to 1 enables configuring the register with READ_EN.
    3. Yes, but please allow me some time to test and confirm. 

    Best regards, 

    Yolanda

  • 0 in reply to Yolanda Gonzalez
    Prodigy 10 points

    Hello Yolanda--san

    I was able to solve the problem thanks to your help.

    Thank you for your help.