Datasheet

AD7328 Data Sheet
Rev. C | Page 24 of 36
SEQUENCE REGISTER
The sequence register on the AD7328 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 AD7328 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 13).
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 AD7328 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 13).
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 13. 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.