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ADS8866: read data is always 0

Joyce Hu
Prodigy 40 points

Part Number: ADS8866

Hi, my customer use ADS8866, the schematic is as following.Now the data is read abnormal. Is there any problem?  Is there have an code example?

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  • 0
    TI__Expert 3805 points

    Hi user4768533,

    Looking at your schematic, you are using "4-Wire CS Mode Without a Busy Indicator" mode of operation as mentioned in the data-sheet. I think there are certain things that will need some working around -

    ADS8866                    MSP430 (existing)                   MSP430 (should be)

    DIN                              UCA0SIMO                                  UCA0STE             -- because DIN is chip select for the ADC
    CNV                            UCA0STE                                     xxx                        -- This pin determines start of conversion; I recommend timer output.
    DOUT                          UCA0SOMI                                  UCA0SOMI           -- This connection requires no change.
    SCLK                           UCA0CLK                                    UCA0SCLK          -- This connection requires no change.

    Please refer to the diagram below for a connection schematic.

    You can refer to the  "4-Wire CS Mode Without a Busy Indicator" mode of operation as mentioned in the data-sheet.

  • 0 in reply to RahulVK
    Prodigy 40 points
    Hi,RahulVK,
    thanks for your reply.