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ADS127L01EVM: SPI enquiry

Ernest Yong
Expert 4315 points
Part Number: ADS127L01EVM
Other Parts Discussed in Thread: ADS127L01

Hi Team,

Based on the “8.5.3 Data Format “ in ADS127L01 datasheet, the data structure is 24 bits + 8 bits status word, so:

  1. May I know is the SPI of ADS127L01 also send data out in 32 bits structure?
  2. As based on the “8.5.4 Status Word”, we can disable the 8 bits status word, so what will the size of SPI send out data after we disable the Status Word feature?
  3. How to disable the status word? Is there any sample code that you can share on how to configure it (disable the data status word) via SPI?
  • 0
    TI__Mastermind 43000 points

    Hello Ernest,

    1.  Yes, on power-up reset, the status word is enabled, and you need to transfer 32b word.

    2.  Yes, you can disable the 8b status word.  After disable of status word, all conversion data will be 24b word size.

    3.  You can disable the 8b status word by writing 1 to the CS_ENB bit of the CONFIG register.  (Figure 96 and Table 23 in the datasheet)

    We do not have specific example code for the ADS127L01, but you can disable the status word by writing 0x02h to the CONFIG register.  Refer to Figure 93. 

    The exact 24b word to send to the ADC in this case will be: 0x41 00 02h

    Regards,
    Keith Nicholas
    Precision ADC Applications