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AD7323
CONTROL REGISTER
The control register is used to select the analog input channel, analog input configuration, reference, coding, and power mode. The
control register is a write-only, 12-bit register. Data loaded on the DIN line corresponds to the AD7323 configuration for the next
conversion. If the sequence register is being used, data should be loaded into the control register after the range register and the sequence
register have been initialized. The bit functions of the control register are shown in Table 9 (the power-up status of all bits is 0).
Rev. 0 | Page 23 of 36
MSB
15
Write
14
Register Select 1
13
Register Select 2
12
ZERO
11
ADD1
10
ADD0
9
Mode 1
8
Mode 0
7
PM1
6
PM0
5
Coding
4
Ref
3
Seq1
2
Seq2
1
ZERO
LSB
0
0
Table 9. Control Register Details
Bit
Mnemonic
12, 1
ZERO
11, 10
ADD1, ADD0
Description
A 0 should be written to these bits.
These two channel address bits are used to select the analog input channel for the next conversion if the
sequencer is not being used. If the sequencer is being used, the two channel address bits are used to
select the final channel in a consecutive sequence.
These two mode bits are used to select the configuration of the four analog input pins, V
IN
0 to V
IN
3. These
pins are used in conjunction with the channel address bits. On the AD7323, the analog inputs can be
configured as four single-ended inputs, two true differential input pairs, two pseudo differential inputs, or
three pseudo differential inputs (see Table 10).
The power management bits are used to select different power mode options on the AD7323 (see Table 11).
This bit is used to select the type of output coding the AD7323 uses for the next conversion result. If
coding = 0, the output coding is twos complement. If coding = 1, the output coding is straight binary.
When operating in sequence mode, the output coding for each channel is the value written to the coding
bit during the last write to the control register.
The reference bit is used to enable or disable the internal reference. If Ref = 0, the external reference is
enabled and used for the next conversion, and the internal reference is disabled. If Ref = 1, the internal
reference is used for the next conversion. When operating in sequence mode, the reference used for each
channel is the value written to the Ref bit during the last write to the control register.
The Sequence 1 and Sequence 2 bits are used to control the operation of the sequencer (see Table 12).
9, 8
Mode 1, Mode 0
7, 6
5
PM1, PM0
Coding
4
Ref
3, 2
Seq1, Seq2
The four analog input channels can be configured as four single-ended analog inputs, two true differential input pairs, two pseudo
differential inputs, or three pseudo differential inputs.
Table 10. Analog Input Configuration Selection
Mode 1 = 1, Mode 0 = 1
Mode 1 = 1, Mode 0 = 0
Channel Address Bits
3 Pseudo Differential I/Ps
2 Fully Differential I/Ps
ADD1
ADD0
V
IN
+
V
IN
V
IN
+
0
0
V
IN
0
V
IN
3
V
IN
0
0
1
V
IN
1
V
IN
3
V
IN
0
1
0
V
IN
2
V
IN
3
V
IN
2
1
1
Not allowed
V
IN
2
Mode 1 = 0, Mode 0 =1
2 Pseudo Differential I/Ps
V
IN
+
V
IN
0
V
IN
0
V
IN
2
V
IN
2
Mode 1 = 0, Mode 0 = 0
4 Single-Ended I/Ps
V
IN
+
V
IN
V
IN
0
AGND
V
IN
1
AGND
V
IN
2
AGND
V
IN
3
AGND
V
IN
V
IN
1
V
IN
1
V
IN
3
V
IN
3
V
IN
V
IN
1
V
IN
1
V
IN
3
V
IN
3
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