TMS320F28379D: SPI driving multiple devices

GMC

Part Number: TMS320F28379D

Hello,

DSP will be communicating with up to 6 devices on SPI bus I and want to make sure I do not miss anything in hardware design.

TMS320F2837xD data sheet specifies sink/source current as 4mA. GPIO rise/fall time as 8nS

Some slaves are on the separate board = extra connector. Load capacitance may be in the 30p range.

Any suggestion on HW design, like buffering control signals or termination,

reference designs with multiple SPI devices on the bus?

Thank you

over 8 years ago

0 Baskaran Chidambaram over 8 years ago

TI__Genius 17370 points

Hello,
I am writing to let you know that a C2000 team member has been assigned to this post and should be answering shortly.

Regards
Baskaran

0 Marlyn Rosales Castaneda20 over 8 years ago

TI__Mastermind 25800 points

Hello,

Unfortunately there are no reference designs with multiple SPI devices on the bus.

However, please feel free to look through the following:

1) App Note on 'Extending the SPI bus for long distance communication' http://www.ti.com/lit/an/slyt441/slyt441.pdf

2) E2E post that covers the main topics not specifically for C2000, but for SPI generally.

https://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/332251

Additionally, the C2000 only supports a single HW SPI chip Select (SPISTE) per module. For multi-slave, additional software will be required to drive individual GPIOs to address each slave.

If you have any specific questions please let me know.

Thank you,

Marlyn

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28379D: SPI driving multiple devices