Part Number: ADS8578S
How are the digital output pins selected for the serial interface mode on the ADS8578S?
The datasheet shows that the serial interface mode allows the ADC to output through either DOUTA, DOUTB, or both pins at once. I have not been able to find any information related on how to select between these options or which option is the default.
Thanks,
Michael L
Hello Michael,
Thanks for your query on E2E.
When PAR/SER/BYTE SEL pin = 1 and DB15/BYTE SEL pin = 0, the serial interface will be selected, all pin connections including dual-function pins can be referred to Pin Description(8.4.1) section in page from 34 to 37in ADS8578S datasheet.
For DOUTA and DOUTB in serial interface, they are described in Serial Data Read(8.4.2.3.3) section, here is a summary:
1. When a total of 14 x 8=112 SCLK cycles is provided to ADS8578S, the entire data for all channels will be available on both DOUTA and DOUTB serial output lines, the channel data order: channels 1, 2, 3, 4, 5, 6, 7, and 8 on DOUTA, channels 5, 6, 7, 8, 1, 2, 3, and 4 on DOUTB, which are shown in below Figure 69. You can use choose DOUTA or DOUTB to all channel data. In this case, using DOUTA for output data read back is recommended because channel 1 data appear first on DOUTA followed by the data for other channels in ascending order.
2. When a total of 14 x 4=56 SCLK cycles is provided to ADS8578S, the entire data for all channels will be available on DOUTA and DOUTB serial output lines as well, but these channel data are shown: channels 1, 2, 3, 4 on DOUTA, channels 5, 6, 7, 8 on DOUTB, which are shown in below Figure 70, You can use both DOUTA and DOUTB to all channel data.
Please let me know if you have more questions, thanks.
Best regards
Dale
