Hello. I hope someone can help me with this.
I have a circuit board that uses an AD5669RBRUZ-2AD5669RBRUZ-2 chip with an external voltage source to generate a voltage value as part of the circuit. I am able to write the appropriate DAC and produce the voltage that I require, however I have been unable to decipher the Analog Devices Data Sheet regarding how to read the contents of one of the 8 DAC values. The data sheet shows 9 "commands" that comprise the upper 4 bits of the command byte. These commands are:
0 0 0 0 - Write to Input Register n (n specified in the lower 4 bits with 0-7 and F means all 8 DACs)
0 0 0 1 - Update DAC Register n
0 0 1 0 - Write to Input Register n; update all
0 0 1 1 - Write to and update DAC Channel n (*** This is the command I use to successfully set the output)
0 1 0 0 - Power down/power up DAC
0 1 0 1 - Load clear code register
0 1 1 0 - Load !LDAC register (in document the LDAC is overscored)
0 1 1 1 - Reset (power-on reset)
1 0 0 0 - Set up internal REF Register
1 0 0 1 - Enable multiple byte mode
The rest of the commands (0xA-0xF) are reserved.
So my question is "Which of the commands do I use to read the DAC?"
Any help would be appreciated.
Larry Byars (boomertn)
