Data Sheet

AD5791

Rev. E | Page 23 of 27

Software Control Register

This is a write only register in which writing a 1 to a particular bit has the same effect as pulsing the corresponding pin low.

Table 14. Software Control Register

MSB

LSB

DB23

DB22

DB21

DB20

DB19

DB3

DB2

DB1

DB0

R/W

Register address

Software control register data

0

1

0

0

Reserved

RESET

1

The CLR function has no effect if the LDAC pin is low.

2

The LDAC function has no effect if the CLR pin is low.

Table 15. Software Control Register Functions

Function

Description

LDAC

Setting this bit to a 1 updates the DAC register and consequently the DAC output.

CLR

Setting this bit to a 1 sets the DAC register to a user defined value (see Table 13) and updates the DAC output. The output

value depends on the DAC register coding that is being used, either binary or twos complement.

RESET

Setting this bit to a 1 returns the AD5791 to its power-on state.