X9428 Datasheet, PDF (10/20 Pages) Xicor Inc. – Single Digitally Controlled Potentiometer

X9428
XFR Wiper Counter Register (WCR) to Data Register (DR)
S device type device _S instruction register _{S S}
T
A
R
T
identifier
0101
addresses
A
3
A
2
0
A
0
A
C
K
opcode
1110
addresses
R
1
R
0
0
0
A
C
K
T
O
P
HIGH-VOLTAGE
WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
S device type
T identifier
device
addresses
S
A
instruction
opcode
S
A
increment/decrement
(sent by master on SDA)
S
T
A
R
T
0
1
0
1
A
3
A
2
0
A
0
C
K
0
0
1
0
0
0
0
0
C _{I/ I/}
KDD
.
.
.
.
I/ I/ ^O
DDP
SYMBOL TABLE
Guidelines for Calculating Typical Values of Bus
Pull-Up Resistors
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
120
100
R_MIN = ^VI_OCLCMMINAX=1.8kΩ
80
R_MAX
=
t_R
C_BUS
60
Max.
Resistance
40
20 _Min.
Resistance
0
0 20 40 60
80 100 120
Bus Capacitance (pF)
10
FN8197.0
March 8, 2005