CCS/ADS7253: Could we decrease the ADS7253 communication time?

user6034716

Part Number: ADS7253

Tool/software: Code Composer Studio

The SPI clock we uses is 15Mhz. Now we send 3*16 bits(=48 bits, = 48 * 1/15 us = 3.2us) as request, and wait 0.5s for conversion, and then it sends back 3*16 bits(=48 bits, = 48 * 1/15 us = 3.2us) to MCU. So it takes totally 6.9us. This is too long for later control. Could we decrease the time in the communication? Especially the request time.

Thanks,

Peter

over 6 years ago

0 Ryan Andrews over 6 years ago

TI__Guru 67626 points

Hello Peter,

Thank you for your post.

The total time between each conversions depends on the SCLK frequency and the number of clocks required. There are four different communication modes as listed in Table 4 of the data sheet. You can reduce the number of clocks depending on the number of SDO pins and the mode used in your application.

Best regards,

0 user6034716 over 6 years ago in reply to Ryan Andrews

Intellectual 600 points

Hi Ryan,

Thanks for your reply. We use '32-CLK, Single-SDO Mode' and found it takes nearly 1.8us totally when set the SCLK 30Mhz.

Peter

0 Ryan Andrews over 6 years ago in reply to user6034716

TI__Guru 67626 points

Hi Peter,

Glad to help! Let us know if you have any other questions!

Best regards,

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CCS/ADS7253: Could we decrease the ADS7253 communication time?