RDAC register is loaded to the EEPROM default value on power up.
EEPROM is at mid-scale which is 0x80 for 8 bit digipot.
My customer is using AD5112 in wireless audio volume control project,they had run pp test and find that When they had control AD5112 with MCU by I2C,output side with A or W pin will have level of change, then it had audio volume's variety, but…
There is no 16 bit register address.
The device I2C is designed as per the I2C specification. Specification – I2C Bus (i2c-bus.org)
Refer to the I2C timing diagrams in Fig 45 in the DS AD5110/AD5112/AD5114 (Rev. B) (analog.com)
A reference timing diagram is given in Figure 45 of DS AD5110/AD5112/AD5114 (Rev. B) (analog.com)
You can use the AD5112 (5kohms) as a Vernier DAC.
This application note may help,
I have some questions for AD5110 Power-On Reset.
Q1) What is the threshold voltage value for POR?
And which pin’s voltage level does monitor for? VLOGIC or both VLOGIC and VDD?
(Please see the attached picture for your reference)