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ADG725 SPI

Question asked by NathanCW on Sep 8, 2011
Latest reply on Sep 12, 2011 by NathanCW

I am trying to drive a ADG725 with a Microchip PIC (3.3 Volt) and I am having trouble getting the multiplexer to respond.  I have hooked up an o-scope to the SYNC, DIN, and SCLK lines and I can see the SYNC line go low, followed by 8 pulses on the clock line while the data line stays at 0.  In theory this

should connect S1A – DA, S1B – DB.  Is there a frame or start bit that I am missing in my SPI protocol?

 

Current code:

 

DelayMs(5);
SYNC = 0;
DelayMs(1);
WriteSPI2(0x00);
DelayMs(1);
SYNC = 1;

 

 

thanks,

 

Nathan

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