X9251 Xicor, X9251 Datasheet - Page 11

• Manufacturer Part Number: X9251
• Description: Quad Digitally-Controlled (XDCP) Potentiometer
• Manufacturer: Xicor

X9251
Figure 2. Two-Byte Instruction Sequence
Figure 3. Three-Byte Instruction Sequence SPI Interface; Write Case
Figure 4. Three-Byte Instruction Sequence SPI Interface, Read Case
REV 1.3.3 2/10/04
S0
SCK
SI
SCK
SI
CS
CS
ID3 ID2 ID1 ID0
ID3 ID2 ID1 ID0
0
0
SCK
Device ID
CS
SI
Device ID
1
1
0
0
1
1
ID3 ID2 ID1 ID0
0
0
0
0
0
Device ID
0
0
0
0
1
Internal
Address
Internal
Address
A1 A0
A1 A0
0
1
0
0
I3
I3 I2
Instruction
0
0
Opcode
Instruction
Opcode
I2
www.xicor.com
A1 A0
Address
Internal
I1
I1 I0
I0
Register
Address
I3
Register
Address
RB RA
RB RA
Instruction
Opcode
I2
DCP/WCR
DCP/WCR
P1
P1
Address
I1
Address
P0
P0
I0
Address
Register
RB RA
Characteristics subject to change without notice.
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
X
Data for WCR[7:0] or DR[7:0]
X
Data Register Bit [7:0]
DCP/WCR
Address
P1
X
Don’t Care
WCR[7:0]
P0
X
or
X
X
X
X
11 of 25