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AD5121 Datasheet(PDF) 20 Page - Analog Devices

Part # AD5121
Description  Quad Channel, 128-/256-Position, I2C, Nonvolatile Digital Potentiometer
PDF  25 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5121 Datasheet(HTML) 20 Page - Analog Devices

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Data Sheet
AD5123/AD5143
THEORY OF OPERATION
analog.com
Rev. C | 20 of 25
Table 11. Advance Commands Operation Truth Table
Command
Number
Control Bits[DB15:DB12]
Address Bits[DB11:DB8]1
Data Bits[DB7:DB0]
1
Operation
C3
C2
C1
C0
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
5
0
1
0
0
A3
A2
A1
A0
X
X
X
X
X
X
X
0
Linear RDAC decrement
6
0
1
0
1
A3
A2
A1
A0
X
X
X
X
X
X
X
1
+6 dB RDAC increment
7
0
1
0
1
A3
A2
A1
A0
X
X
X
X
X
X
X
0
−6 dB RDAC decrement
8
0
1
1
0
A3
A2
A1
A0
X
X
X
X
X
X
X
X
Copy input register to RDAC
(software LRDAC)
9
0
1
1
1
0
0
A1
A0
X
X
X
X
X
X
X
1
Copy RDAC register to EEPROM
10
0
1
1
1
0
0
A1
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
A1
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
A1
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
A1
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 means don’t care.
Table 12. Address Bits
A3
A2
A1
A0
Potentiometer Mode
Linear Gain Setting Mode
Stored RDAC Memory
Input Register
RDAC Register
Input Register
RDAC Register
1
X1
X
1
X
1
All channels
All channels
All channels
All channels
Not applicable
0
0
0
0
RDAC1
RDAC1
RWB1
RWB1
RDAC1
0
1
0
0
Not applicable
Not applicable
RAW1
RAW1
Not applicable
0
0
0
1
RDAC2
RDAC2
RWB2
RWB2
RDAC2
0
1
0
1
Not applicable
Not applicable
RAW2
RAW2
Not applicable
0
0
1
0
RDAC3
RDAC3
RWB3
RWB3
RDAC3
0
1
1
0
Not applicable
Not applicable
RAW3
RAW3
Not applicable
0
0
1
1
RDAC4
RDAC4
RWB4
RWB4
RDAC4
0
1
1
1
Not applicable
Not applicable
RAW4
RAW4
Not applicable
1 X means don’t care.
Table 13. Control Register Bit Descriptions
Bit Name
Description
D0
RDAC register write protect
0 = wiper position frozen to value in EEPROM memory
1 = allows update of wiper position through digital interface (default)
D1
EEPROM program enable
0 = EEPROM program disabled
1 = enables device for EEPROM program (default)



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