Datasheet

AD7329 Data Sheet
Rev. B | Page 28 of 40
SEQUENCE REGISTER
The sequence register on the AD7329 is an 8-bit, write-only register. Each of the eight analog input channels has one corresponding bit in
the sequence register. To select a channel for inclusion in the sequence, set the corresponding channel bit to 1 in the sequence register.
MSB
LSB
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Write Register Select 1 Register Select 2 V
IN
0 V
IN
1 V
IN
2 V
IN
3 V
IN
4 V
IN
5 V
IN
6 V
IN
7 0 0 0 0 0
RANGE REGISTERS
The range registers are used to select one analog input range per analog input channel. Range Register 1 is used to set the ranges for Channel 0 to
Channel 3. It is an 8-bit, write-only register with two dedicated range bits for each of the analog input channels from Channel 0 to Channel 3.
There are four analog input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V. A write to Range Register 1 is selected by setting the write bit to 1
and the range select bits to 0 and 1, respectively. After the initial write to Range Register 1 occurs, each time an analog input is selected,
the AD7329 automatically configures the analog input to the appropriate range, as indicated by Range Register 1. The ±10 V input range
is selected by default on each analog input channel (see Table 15).
MSB LSB
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Write Register Select 1 Register Select 2 V
IN
0A V
IN
0B V
IN
1A V
IN
1B V
IN
2A V
IN
2B V
IN
3A V
IN
3B 0 0 0 0 0
Range Register 2 is used to set the ranges for Channel 4 to Channel 7. It is an 8-bit, write-only register with two dedicated range bits for
each of the analog input channels from Channel 4 to Channel 7. There are four analog input ranges, ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V.
After the initial write to Range Register 2 occurs, each time an analog input is selected, the AD7329 automatically configures the analog
input to the appropriate range, as indicated by Range Register 2. The ±10 V input range is selected by default on each analog input
channel (see Tabl e 15).
MSB LSB
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Write
Register Select 1
Register Select 2
V
IN
4A
V
IN
4B
V
IN
5A
V
IN
5B
V
IN
6A
V
IN
6B
V
IN
7A
V
IN
7B
0
0
0
0
0
Table 15. Range Selection
V
IN
xA V
IN
xB Description
0 0 This combination selects the ±10 V input range on V
IN
x.
0 1 This combination selects the ±5 V input range on V
IN
x.
1 0 This combination selects the ±2.5 V input range on V
IN
x.
1 1 This combination selects the 0 V to +10 V input range on V
IN
x.