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RM48L952: Is it possible to connect 2 SOMI pins to one SPI interface?

Matteo Samsa
Prodigy 20 points
Part Number: RM48L952
Other Parts Discussed in Thread: ADS8355, TIDA-00176, ADS8354

Hi, 

I want to use ADS8355IRTET with RM48L952. 

The ADS8355 has an SPI interface with two outputs, one for channel A and one for channel B data. How can I connect it to the RM48L952?

If it's not possible to use 2 SOMI pins on the RM48, then I know I can use only one pin for both channels.

ADS8355 datasheet: https://www.ti.com/lit/ds/symlink/ads8355.pdf
Reference design for TIDA-00176 which uses ADS8354: https://www.ti.com/tool/TIDA-00176#design-products

RM48x reference manual: https://www.ti.com/lit/ug/spnu503c/spnu503c.pdf
RM48L952 datasheet: https://www.ti.com/lit/ds/symlink/rm48l952.pdf

Best regards,

Matteo

  • +1
    TI__Guru**** 192156 points

    Hi Matteo,

    RM48 does support SI parallel mode. But the data format in parallel mode is a little complex. 

    1. In parallel mode, the data length has to be 16-bit

    2. For 2 line mode (2 SOMI, and 2 SIMO), data bit [15:8] is from SOMI[1] pin, and data bit [7:0] is from SOMI[0] pin. Data[15:8] is transmitted on SIMO[1] pin, and data[7:0] is transmitted on SIMO[0] pin.

    Just read ADS8355 datasheet, the parallel mode doesn't work for ADS8355.