X9251_07 Datasheet, PDF (10/20 Pages) Intersil Corporation – Quad Digitally-Controlled (XDCP™) Potentiometer

X9251
Instruction Format
Read Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
0 0 A1 A0 1 0 0 1
WCR
Addresses
00 0 0
Wiper Position
(Sent by X9251 on SO)
WWWWWWWW
CCCCCCCC
RRRRRRRR
76543210
CS
Rising
Edge
Write Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
0 0 A1 A0 1 0 1 0
WCR
Addresses
00 0 0
Data Byte
(Sent by Host on SI)
WWWWWWWW
CCCCCCCC
RRRRRRRR
76543210
CS
Rising
Edge
Read Data Register (DR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
DR and WCR
Addresses
Data Byte
(Sent by X9271 on SO)
0
0 A1 A0 1
0
1
1 RB RA
P1
P0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
CS
Rising
Edge
Write Data Register (DR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
Instruction
Opcode
DR and WCR
Addresses
Data Byte
(Sent by Host on SI)
0
0
A1
A0
1
1
0
0
RB
RA
P1
P0
D
7
D
6
DD
54
D
3
D
2
D
1
D
0
CS
Rising
Edge
HIGH-VOLTAGE
WRITE CYCLE
Global Transfer Data Register (DR) to Wiper Counter Register (WCR)
CS
Falling
Edge
Device Type
Identifier
0101
Device
Addresses
0 0 A1 A0
Instruction
Opcode
0001
DR
Addresses
RB RA 0 0
CS
Rising
Edge
NOTES:
1. “A1 ~ A0”: stands for the device addresses sent by the master.
2. WPx refers to wiper position data in the Counter Register
3. “I”: stands for the increment operation, SI held HIGH during active SCK phase (high).
4. “D”: stands for the decrement operation, SI held LOW during active SCK phase (high).
10
FN8166.5
April 13, 2007