Datasheet

AD5122A/AD5142A Data Sheet
Rev. A | Page 24 of 32
Table 16. Advanced Command Operation Truth Table
Command
Number
Command
Bits[DB15:DB12]
Address
Bits[DB11:DB8]
1
Data Bits[DB7:DB0]
1
C3 C2 C1 C0 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Operation
0 0 0 0 0 X X X X X X X X X X X X NOP: do nothing
1 0 0 0 1 0 A2 0 A0 D7 D6 D5 D4 D3 D2 D1 D0 Write contents of serial
register data to RDAC
2 0 0 1 0 0 A2 0 A0 D7 D6 D5 D4 D3 D2 D1 D0 Write contents of serial
register data to input
register
3 0 0 1 1 X A2 A1 A0 X X X X X X D1 D0 Read back contents
D1 D0 Data
0 0 Input register
0 1 EEPROM
1 0 Control
register
1 1 RDAC
4
0
1
0
0
A3
A2
0
A0
X
X
X
X
X
X
X
1
Linear RDAC increment
5 0 1 0 0 A3 A2 0 A0 X X X X X X X 0 Linear RDAC decrement
6 0 1 0 1 A3 A2 0 A0 X X X X X X X 1 +6 dB RDAC increment
7 0 1 0 1 A3 A2 0 A0 X X X X X X X 0 −6 dB RDAC decrement
8 0 1 1 0 0 A2 0 A0 X X X X X X X X Copy input register to RDAC
(software LRDAC)
9 0 1 1 1 0 A2 0 A0 X X X X X X X 1 Copy RDAC register to
EEPROM
10 0 1 1 1 0 A2 0 A0 X X X X X X X 0 Copy EEPROM into RDAC
11 1 0 0 0 0 0 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 Write contents of serial
register data to EEPROM
12
1
0
0
1
A3
A2
0
A0
1
X
X
X
X
X
X
D0
Top scale
D0 = 0; normal mode
D0 = 1; shutdown mode
13
1
0
0
1
A3
A2
0
A0
0
X
X
X
X
X
X
D0
Bottom scale
D0 = 1; enter
D0 = 0; exit
14 1 0 1 1 X X X X X X X X X X X X Software reset
15 1 1 0 0 A3 A2 0 A0 X X X X X X X D0 Software shutdown
D0 = 0; normal mode
D0 = 1; device placed in
shutdown mode
16 1 1 0 1 X X X X X X X X D3 D2 D1 D0 Copy serial register data to
control register
1
X = don’t care.
Table 17. Address Bits
A3 A2 A1 A0
Potentiometer Mode Linear Gain Setting Mode
Stored Channel
Memory Input Register RDAC Register Input Register RDAC Register
1 X
1
X
1
X
1
All channels All channels All channels All channels Not applicable
0 0 0 0 RDAC1 RDAC1 R
WB1
R
WB1
RDAC1/R
WB1
0 1 0 0 Not applicable Not applicable R
AW1
R
AW1
Not applicable
0 0 0 1 RDAC2 RDAC2 R
WB2
R
WB2
R
AW1
0 1 0 1 Not applicable Not applicable R
AW2
R
AW2
Not applicable
0 0 1 0 Not applicable Not applicable Not applicable Not applicable RDAC2/R
WB2
0 0 1 1 Not applicable Not applicable Not applicable Not applicable R
AW2
1
X = don’t care.