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AD7328
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.
Rev. A | Page 24 of 36
MSB
16
Write
15
Register Select 1
14
Register Select 2
13
V
IN
0
12
V
IN
1
11
V
IN
2
10
V
IN
3
9
V
IN
4
8
V
IN
5
7
V
IN
6
6
V
IN
7
5
0
4
0
3
0
2
0
LSB
1
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. 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
16
Write
15
Register Select 1
14
Register Select 2
13
V
IN
0A
12
V
IN
0B
11
V
IN
1A
10
V
IN
1B
9
V
IN
2A
8
V
IN
2B
7
V
IN
3A
6
V
IN
3B
5
0
4
0
3
0
2
0
LSB
1
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 Table 13).
MSB
16
Write
15
Register Select 1
14
Register Select 2
13
V
IN
4A
12
V
IN
4B
11
V
IN
5A
10
V
IN
5B
9
V
IN
6A
8
V
IN
6B
7
V
IN
7A
6
V
IN
7B
5
0
4
0
3
0
2
0
LSB
1
0
Table 13. Range Selection
V
IN
xA
0
0
1
1
V
IN
xB
0
1
0
1
Description
This combination selects the ±10 V input range on V
IN
x.
This combination selects the ±5 V input range on V
IN
x.
This combination selects the ±2.5 V input range on V
IN
x.
This combination selects the 0 V to +10 V input range on V
IN
x.
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