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AD5235 View Datasheet(PDF) - Analog Devices

Part NameDescriptionManufacturer
AD5235 Nonvolatile Memory, Dual 1024-Position Digital Potentiometer ADI
Analog Devices ADI
AD5235 Datasheet PDF : 32 Pages
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AD5235
In Table 6, command bits are C0 to C3, address bits are A0 to A3, Data Bit D0 to Data Bit D9 are applicable to RDAC, and D0 to D15 are
applicable to EEMEM.
Table 6. 24-Bit Serial Data-Word
MSB
Command Byte 0
Data Byte 1
Data Byte 0
LSB
RDAC C3 C2 C1 C0 0 0 0 A0 X X X X X X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
EEMEM C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Command instruction codes are defined in Table 7.
Table 7. Command Operation Truth Table1, 2, 3
Command Byte 0
Command B23
B16
Number C3 C2 C1 C0 A3 A2 A1 A0
0
0 000XXXX
1
0 0 0 1 0 0 0 A0
2
0 0 1 0 0 0 0 A0
34
0 0 1 1 A3 A2 A1 A0
45
0 1 0 0 0 0 0 A0
55
0 101XXXX
65
0 1 1 0 0 0 0 A0
75
0 111XXXX
8
1 0000000
9
1 0 0 1 A3 A2 A1 A0
10
1 0 1 0 0 0 0 A0
11
1 0 1 1 0 0 0 A0
125
1 1 0 0 0 0 0 A0
135
1 101XXXX
145
1 1 1 0 0 0 0 A0
155
1 111XXXX
Data Byte 1
B15
B8
X … D9 D8
X …X X
X …X X
X …X X
D15 …
D8
X …X X
X …X X
X …X X
X …X X
X …X X
X …X X
X …X X
X … D9 D8
X …X X
X …X X
X …X X
X …X X
Data Byte 0
B7
B0
D7 … D0
X …X
X …X
X …X
D7 … D0
X …X
X …X
X …X
X …X
X …X
X …X
X …X
D7 … D0
X …X
X …X
X …X
X …X
Operation
NOP. Do nothing. See Table 19
Restore EEMEM (A0) contents to RDAC (A0)
register. See Table 16.
Store wiper setting. Store RDAC (A0) setting to
EEMEM (A0). See Table 15.
Store contents of Serial Register Data Byte 0
and Serial Register Data Bytes 1 (total 16 bits)
to EEMEM (ADDR). See Table 18.
Decrement by 6 dB. Right-shift contents of
RDAC (A0) register, stop at all 0s.
Decrement all by 6 dB. Right-shift contents of
all RDAC registers, stop at all 0s.
Decrement contents of RDAC (A0) by 1,
stop at all 0s.
Decrement contents of all RDAC registers by 1,
stop at all 0s.
Reset. Refresh all RDACs with their corresponding
EEMEM previously stored values.
Read contents of EEMEM (ADDR) from
SDO output in the next frame. See Table 19.
Read RDAC wiper setting from SDO output
in the next frame. See Table 20.
Write contents of Serial Register Data Byte 0
and Serial Register Data Byte 1 (total 10 bits)
to RDAC (A0). See Table 14.
Increment by 6 dB: Left-shift contents of RDAC
(A0), stop at all 1s. See Table 17.
Increment all by 6 dB. Left-shift contents of
all RDAC registers, stop at all 1s.
Increment contents of RDAC (A0) by 1,
stop at all 1s. See Table 15.
Increment contents of all RDAC registers by 1,
stop at all 1s.
1 The SDO output shifts out the last 24 bits of data clocked into the serial register for daisy-chain operation. Exception: for any instruction following Instruction 9 or
Instruction 10, the selected internal register data is present in Data Byte 0 and Data Byte 1. The instructions following Instruction 9 and Instruction 10 must also be a
full 24-bit data-word to completely clock out the contents of the serial register.
2 The RDAC register is a volatile scratchpad register that is refreshed at power-on from the corresponding nonvolatile EEMEM register.
3 Execution of these operations takes place when the CS strobe returns to logic high.
4 Instruction 3 writes two data bytes (16 bits of data) to EEMEM. In the case of Address 0 and Address 1, only the last 10 bits are valid for wiper position setting.
5 The increment, decrement, and shift instructions ignore the contents of the shift register, Data Byte 0 and Data Byte 1.
Rev. E | Page 19 of 32
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