X9400_15 Datasheet, PDF (9/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

X9400
Instruction Format
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).
Read Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1001
WCR
addresses
0
0
P
1
P
0
wiper position
(sent by X9400 on SO) _CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Write Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1010
WCR
addresses
0
0
P
1
P
0
Data Byte
(sent by Host on SI)
CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Read Data Register (DR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1011
DR and WCR
addresses
RRPP
1010
Data Byte
(sent by X9400 on SO) _CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
Write Data Register (DR)
device type device instruction
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1100
DR and WCR
addresses
RRPP
1010
Data Byte
(sent by host on SI)
CS
0
0
W
P
W
P
W
P
W
P
W
P
W
P
Rising
Edge
543210
HIGH-VOLTAGE
WRITE CYCLE
Transfer Data Register (DR) to Wiper Counter Register (WCR)
CS
Falling
Edge
device type
identifier
0101
device
addresses
0
0
A
1
A
0
instruction
opcode
1101
DR and WCR
addresses
RRPP
1010
CS
Rising
Edge
Transfer Wiper Counter Register (WCR) to Data Register (DR)
device type device instruction DR and WCR
CS
Falling
identifier
addresses
opcode
addresses
CS
Rising
Edge
0
1
0
1
0
0
AA
10
1
1
1
0
R
1
R
0
P
1
P
0
Edge
HIGH-VOLTAGE
WRITE CYCLE
9
FN8189.4
September 2, 2015