X9271 Datasheet, PDF (9/23 Pages) Xicor Inc. – Single Digitally-Controlled (XDCP) Potentiometer

X9271
Figure 2. Two-Byte Instruction Sequence
CS
SCK
SI
0 1 0 10 0
00
ID3 ID2 ID1 ID0 0 0 A1 A0 I3 I2 I1 I0 RB RA P1 P0
Device ID
Internal
Address
Instruction
Opcode
Register Pot/Bank
Address Address
These commands only valid when P1=P0=0
Figure 3. Three-Byte Instruction Sequence (Write)
CS
SCL
SI
0 1 0 1 00
ID3 ID2 ID1 ID0 0 0 A1 A0
Device ID
Internal
Address
I3 I2 I1 I0 RB RA P1 P0
D7 D6 D5 D4 D3 D2 D1 D0
Instruction
Opcode
Register Pot/Bank WCR[7:0] valid only when P1=P0=0;
Address ^Address
or
Data Register Bit [7:0] for all values of P1 and P0
Figure 4. Three-Byte Instruction Sequence (Read)
CS
SCL
SI
0 1 0 1 00
ID3 ID2 ID1 ID0 ^{0 0 A1 A0}
Device ID
Internal
Address
I3 I2 I1 I0 RB RA P1 P0
XXXXX XXX
Don’t Care
Instruction
Opcode
Register Pot/Bank
Address Address
S0
D7 D6 D5 D4 D3 D2 D1 D0
WCR[7:0] valid only when P1=P0=0;
or
Data Register Bit [7:0] for all values of P1 and P0
REV 1.1.7 2/6/03
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Characteristics subject to change without notice. 9 of 23