F28335 clock outputs for data converters

Alejandro Rodriguez1

Other Parts Discussed in Thread: TMS320F28335

I am planning on using two external ADC's and one DAC. I was wondering which pins of the uC (TMS320F28335) can give clock outputs for these converters. I can't seem to find it in the datasheet, I am probably overlooking it. Thanks.

over 12 years ago

0 Devin Cottier over 12 years ago

TI__Guru 60865 points

Hi Alejandro,

What interface are you planning on using for these external data converters (i.e. SPI, I2C, parallel, etc.)?

You can either use the XCLKOUT functionality (divided-down system clock from the MCU) or a clock from your chosen communication interface, depending on how you plan on interfacing to the MCU.

0 Alejandro Rodriguez1 over 12 years ago in reply to Devin Cottier

Intellectual 300 points

I will be using parallel interface. Can XCLKOUT have a different frequency for the ADC's and the DAC?

0 Devin Cottier over 12 years ago in reply to Alejandro Rodriguez1

TI__Guru 60865 points

No, there is only one XCLKOUT pin. You could add an external T flip-flop to divide this down further and derive another frequency.

A better option if you need multiple clock frequencies would probably be to use multiple ePWM modules to produce the different clocks.

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F28335 clock outputs for data converters