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AD7328
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 AD7328 configuration for the next conversion. If the
sequence register is being used, data should be loaded into the control register after the range registers 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. A | Page 22 of 36
MSB
15
Write
14
Register
Select 1
13
Register
Select 2
12
ADD2
11
ADD1
10
ADD0
9
Mode 1
8
Mode 0
7
PM1
6
PM0
5
Coding
4
Ref
3
Seq1
2
Seq2
1
Weak/
Three-State
LSB
0
0
Table 9. Control Register Details
Bit
Mnemonic
12, 11, 10
ADD2, ADD1,
ADD0
Description
These three 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 three 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 eight analog input pins, V
IN
0 to V
IN
7. These
pins are used in conjunction with the channel address bits. On the AD7328, the analog inputs can be configured
as eight single-ended inputs, four fully differential input pairs, four pseudo differential inputs, or seven
pseudo differential inputs (see Table 10).
The power management bits are used to select different power mode options on the AD7328 (see Table 11).
This bit is used to select the type of output coding the AD7328 uses for the next conversion result. If the
coding = 0, the output coding is twos complement. If the 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 ref-
erence 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).
This bit selects the state of the DOUT line at the end of the current serial transfer. If the bit is set to 1, the
DOUT line is weakly driven to Channel Address Bit ADD2 of the following conversion. If this bit is set to 0,
DOUT returns to three-state at the end of the serial transfer (see the Serial Interface section).
The eight analog input channels can be configured as seven pseudo differential analog inputs, four pseudo differential inputs, four true
differential input pairs, or eight single-ended analog inputs.
Table 10. Analog Input Configuration Selection
Mode 1 = 1, Mode 0 = 1
Mode 1 = 1, Mode 0 = 0
Channel Address Bits
7 Pseudo Differential I/Ps
4 Fully Differential I/Ps
ADD2 ADD1
ADD0
V
IN
+
V
IN
V
IN
+
0
0
0
V
IN
0
V
IN
7
V
IN
0
0
0
1
V
IN
1
V
IN
7
V
IN
0
0
1
0
V
IN
2
V
IN
7
V
IN
2
0
1
1
V
IN
3
V
IN
7
V
IN
2
1
0
0
V
IN
4
V
IN
7
V
IN
4
1
0
1
V
IN
5
V
IN
7
V
IN
4
1
1
0
V
IN
6
V
IN
7
V
IN
6
1
1
1
Temperature indicator
V
IN
6
9, 8
Mode 1, Mode 0
7, 6
5
PM1, PM0
Coding
4
Ref
3, 2
1
Seq1/Seq2
Weak/Three-State
Mode 1 = 0, Mode 0 = 1
4 Pseudo Differential I/Ps
V
IN
+
V
IN
0
V
IN
0
V
IN
2
V
IN
2
V
IN
4
V
IN
4
V
IN
6
V
IN
6
Mode 1 = 0, Mode 0 = 0
8 Single-Ended I/Ps
V
IN
+
V
IN
0
V
IN
1
V
IN
2
V
IN
3
V
IN
4
V
IN
5
V
IN
6
V
IN
7
V
IN
V
IN
1
V
IN
1
V
IN
3
V
IN
3
V
IN
5
V
IN
5
V
IN
7
V
IN
7
V
IN
V
IN
1
V
IN
1
V
IN
3
V
IN
3
V
IN
5
V
IN
5
V
IN
7
V
IN
7
V
IN
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
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