X9430 Datasheet, PDF (8/21 Pages) Xicor Inc. – Dual Digitally Controlled Potentiometer (XDCP™) with Operational Amplifier

X9430
REGISTER DESCRIPTIONS AND MEMORY MAP
Memory Map
WCRO
DR0
DR1
DR2
DR3
WCR1
DR0
DR1
DR2
DR3
Wiper Counter Register (WCR)
0 0 WP5 WP4 WP3 WP2 WP1 WP0
(volatile)
(LSB)
WP0 - WP5 identify wiper position.
Data Registers (DR, R0 - R3)
Wiper Position or User Data
(Nonvolatile)
Instruction Format
Notes: (1) “A1 ~ A0”: stands for the device addresses sent by the master.
(2) WPx refers to wiper position data in the Wiper 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)
Read the contents of the Wiper Counter Register pointed to by P₁ - P₀
device type device instruction
WCR
wiper position
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1001
addresses
0
0
0
P
0
(sent by X9430 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Wiper Counter Register (WCR)
Write new value to the Wiper Counter Register pointed to by P₁ - P₀
device type device instruction
WCR
Data Byte
CS ^{identifier addresses opcode addresses (sent by Host on SI)}
CS
Falling
Edge
0
1
0
1
0
0
A
1
A
0
1
0
1
0
0
0
0
P
0
0
W W W W W W ^Rising
0 P P P P P P ^Edge
543210
Read Data Register (DR)
Read the contents of the Register pointed to by P₁ - P₀ and R₁ - R₀
device type device instruction DR/WCR
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1011
addresses
R
1
R
0
0
P
0
Data Byte
(sent by X9430 on SO) _CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
Write Data Register (DR)
Write new value to the Register pointed to by P₁ - P₀ and R₁ - R₀
device type device instruction DR/WCR
CS
Falling
Edge
identifier
0101
addresses
0
0
A
1
A
0
opcode
1100
addresses
R
1
R
0
0
P
0
Data Byte
(sent by host on SI)
CS
W W W W W W ^Rising
0 0 P P P P P P ^Edge
543210
HIGH-VOLTAGE
WRITE CYCLE
8
FN8198.0
March 11, 2005