DAC8718 question

Hi Kerr,

kerr chang said:

1 : SPI have 3 mode ( mode0 , mode1 and mode2[CPOL/CPHA] ) , What mode is DAC8718 support?

The DAC8718 can have a the clock be idle at either HIGH or LOW, so either CPOL is okay, as long as the data is latched on the falling edge, so the possible combinations are: (CPOL = 0, CPHA = 1) or (CPOL = 1, CPHA = 0)

kerr chang said:

2 : DAC8718 have 3 GPIO pin , Can we use DAC8718 GPIO pin to control DAC8718 Pin CLR / LDAC and USB/BTC?

This is certainly possible, however for CLR and /LDAC, you have more robust options.
1) Instead of controlling LDAC with a GPIB, you can use the bit LD to as a software /LDAC, which would have the same behavior as using the GPIB to control the /LDAC pin.

2) Instead of using a GPIB to control CLR, you can simply write the value that you desire. If you know the default value that you want to implement, this will still fulfill the same role.

kerr chang said:

3 : What is /LDAC pin function ? How time we need use this pin?

LDAC allows for the synchronous update of all the channels at once or asynchronous update of an individual channel. You can refer to page 43 in the DAC8718 datasheet for more information.