X9429 Datasheet, PDF (12/21 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer

X9429
XFR Wiper Counter Register (WCR) to Data Register (DR)
S device type
T identifier
device
addresses
S
A
instruction
opcode
register
addresses
SS
AT
A
R
T
0
1
0
1
A
3
A
2
0
A
0
C
K
1
1
1
0
RR
10
0
0
CO
KP
HIGH-VOLTAGE
WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
S device type device
instruction
increment/decrement
T
A
R
T
identifier
0101
addresses
A
3
A
2
0
A
0
S
A
C
K
opcode
0010
0
0
0
0
S
A
C
K
(sent by master on SDA)
I/
D
I/
D
.
.
.
.
I/ I/
DD
S
T
O
P
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
Will be
steady
May change
from Low to
High
May change
from High to
Low
Don’t Care:
Changes
Allowed
N/A
Will change
from Low to
High
Will change
from High to
Low
Changing:
State Not
Known
Center Line
is High
Impedance
Guidelines for Calculating Typical Values of Bus
Pull-Up Resistors
120
100
R_MIN
=
V_{CC MAX}
I_{OL MIN}
=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)
12
FN8248.2
October 19, 2005