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ADS7229: Operation process

Amy Luo
Expert 6895 points
Part Number: ADS7229

Hi team,

Customer uses CPLD to control ADS7229, because they need to use state machine, they need to know how the workflow of ADS7229 is.

For example: register (CFR) configuration through SPI interface --> start conversion --> wait for conversion to complete --> output data (SDO) --> to start the next conversion?

The customer plans to use manual mode to read data during the conversion process, and configure whether CFR needs to be written every cycle or only once during initialization?

I am not familiar with software operation, please help me answer. Thank you in advance.

Best Regards,
Amy Luo

  • 0
    TI__Guru 60646 points

    Hello Amy,

    Thank you for your post.

    The device only needs to be configured one time after power up if the desired settings are different than the default configuration (see page 32).

    In manual mode, the channel is selected by writing to the CMR register with a simple 4-bit command (see Table 3). While /CONVST is high, the device is in acquisition mode. The conversion cycle is started with the falling edge of /CONVST. This will end the acquisition mode of the converter. The conversion is completed by the internal conversion clock (CCLK). The data can be read by issuing a READ result command either while the ADC is converting or while it is sampling the next acquisition (Figures 1 and 2).

    The exact order of operation will depend on when the customer wishes to read the data.

    Regards,