how to connect PIC 18F4550 TO DAC 7611

Hi friends,

I wanna send data from PIC 18f4550 to DAC 7611, firstly I should design the appropriate circuit. I've read both PIC18f4550 and DAC7611 data sheets to connect these two elements.

I've found that I should connect SDO pin of pic to DAC SDI pin and CLK pic pin to CLK of DAC, but I don't know which pin of PIC should be connected to LD pin of DAC ( load strobe pin).

Please let me know the correct connection.

Best,
Mehregan

Hello mehregan,

The DAC you have selected uses 3-Wire SPI interface. In this 3-Wire SPI mode you can only send data to your DAC and cant read anything from your DAC.

Please make following connections:

SDO pin of PIC to SDI pin of DAC
SDI pin of PIC to SDO pin of PIC (This will enable loopback whatever you will send out will be received back, however this is optional you can leave this pin un-connected)
SS pin of PIC to CS pin of DAC
SCK pin of PIC to the CLK pin of DAC

and for CLR and LD pins of DAC you can use any GPIO pin of the PIC18F4550. To have fast communication between your DAC and PIC you should configure your PIC to use SPI peripherial mode.

Regards