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TPS92661EVM-001: TPS92661EVM-001 , why EVM's on chip TMS320F28035 use external clock?

Part Number: TPS92661EVM-001
Other Parts Discussed in Thread: TMS320F28035, TMS320F28030

Hi All,

May I know why TPS92661EVM-001 use an external clock for TMS320F28035?

Does it have any purpose to use external clock?

Can I use internal oscillators?

  • Hi Kevin,

     

    From the product line:

     

    As you may know, the TMS320F28035 has the following options for clocks: (Taken from the TMS320F28030 etc… data sheet)

     

    ***I am having trouble pasting pictures so refer to 6.1.13 of the datasheet here...

     

     

    Also from the data sheet, the zero-pin oscillator frequency varies with temperature.  The communication between the TMS320 and the TPS92661 is accomplished with a UART which depends on a stable clock frequency.  The variation that occurs with temperature of the zero pin oscillators will not meet the requirements for robust communications.

    ***I am having trouble pasting pictures so refer to table 5-7 and figure 5-9 here...