X9408_14 Datasheet, PDF (10/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

X9408
Write Wiper Counter Register (WCR) to Data Register (DR)
S DEVICE TYPE
DEVICE
INSTRUCTION
DR AND WCR
T
IDENTIFIER
ADDRESSES S
OPCODE
ADDRESSES
SS
A
A
AT
R ^{0 1 0 1 A3 A2 A1 A0} C ^{1 1 1 0 R1 R0 P1 P0} C O
T
K
KP
HIGH-VOLTAGE
WRITE CYCLE
Increment/Decrement Wiper Counter Register (WCR)
S DEVICE TYPE
DEVICE
INSTRUCTION
T
IDENTIFIER
ADDRESSES S
OPCODE
A
A
R ^{0 1 0 1 A3 A2 A1 A0} C ^{0 0 1 0}
T
K
WCR
INCREMENT/DECREMENT
ADDRESSES S
(SENT BY MASTER ON SDA)
S
A
T
0 0 P1 P0 _C I/D I/D . . . . I/D I/D _O
K
P
Global XFR Data Register (DR) to Wiper Counter Register (WCR)
S
DEVICE TYPE
DEVICE
T
IDENTIFIER
ADDRESSES
S
A
A
R ^{0 1 0 1 A3 A2 A1 A0} C
T
K
INSTRUCTION
DR
OPCODE
ADDRESSES
SS
AT
0
0
0
1 R1 R0 0 0 _{C O}
KP
Global XFR Wiper Counter Register (WCR) to Data Register (DR)
S DEVICE TYPE
DEVICE
INSTRUCTION
DR
T
IDENTIFIER
ADDRESSES
S
OPCODE
ADDRESSES
SS
A
A
AT
R _{0 1 0 1 A3 A2 A1 A0} C _{1 0 0 0 R1 R0 0 0} C O
T
K
KP
HIGH-VOLTAGE
WRITE CYCLE
Symbol Table
WAVEFORM
INPUTS
OUTPUTS
MUST BE
STEADY
WILL BE
STEADY
MAY CHANGE WILL CHANGE
FROM LO W TO FROM LWO TO
HIGH
HIGH
MAY CHANGE WILL CHANGE
FROM HIGH TO FROM HIGH TO
LOW
LOW
DON’T CARE:
CHANGES
ALLOWED
N/A
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
t_R
R_MAX = _CBUS
60
MAX.
RESISTANCE
40
20 _Min.
Resistance
0
0 20 40 60 80 100 120
BUS CAPACITANCE (pF)
10
FN8191.4
January 15, 2009