X9401_15 Datasheet, PDF (7/20 Pages) Intersil Corporation – Quad, 64 Tap, Digitally Controlled Potentiometer

X9401
CS
SCL
SI
S0
CS
SCK
0 1 0 1 0 0 A1 A0
I3 I2 I1 I0 R1 R0 P1 P0
DON’T CARE
0 0 D5 D4 D3 D2 D1 D0
FIGURE 5. THREE-BYTE COMMAND SEQUENCE (READ)
SI
0 1 0 1 0 0 A1 A0
I3 I2 I1 I0 0 0 P1 P0
II
ID
D
NN
NE
E
CC
CC
C
12
N1
N
FIGURE 6. INCREMENT/DECREMENT COMMAND SEQUENCE
SCK
T_WRID
SI
V_W/R_W
VOLTAGE OUT
INC/DEC CMD ISSUED
INSTRUCTION
Read Wiper Counter Register
Write Wiper Counter Register
Read Data Register
Write Data Register
XFR Data Register to Wiper
Counter Register
FIGURE 7. INCREMENT/DECREMENT TIMING LIMITS
TABLE 1. INSTRUCTION SET
INSTRUCTION SET
I₃ I₂ I₁ I₀ R₁ R₀ P₁ P₀
OPERATION
1 0 0 1 0 0 P₁ P₀ Read the contents of the Wiper Counter Register pointed to by
P₁ - P₀
1 0 1 0 0 0 P₁ P₀ Write new value to the Wiper Counter Register
pointed to by P₁ - P₀
1 0 1 1 R₁ R₀ P₁ P₀ Read the contents of the Data Register pointed to by P₁ - P₀ and
R₁ - R₀
1 1 0 0 R₁ R₀ P₁ P₀ Write new value to the Data Register pointed to by
P₁ - P₀ and R₁ - R₀
1 1 0 1 R₁ R₀ P₁ P₀ Transfer the contents of the Data Register pointed to by R₁ - R₀
to the Wiper Counter Register pointed to by P₁ - P₀
7
FN8190.5
September 14, 2015