X9409 Datasheet PDF - Xicor
| Part Number | X9409 | |
| Description | Quad Digitally Controlled Potentiometers | |
| Manufacturers | Xicor | |
| Logo |  |
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APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/2-Wire Bus
X9409
Preliminary Information
Quad Digitally Controlled Potentiometers (XDCP™)
FEATURES
• Four potentiometers per package
• 64 resistor taps
• 2-wire serial interface for write, read, and trans-
fer operations of the potentiometer
• 50Ω Wiper resistance, typical at 5V.
• Four non-volatile data registers for each
potentiometer
• Non-volatile storage of multiple wiper position
• Power on recall. Loads saved wiper position on
power up.
• Standby current < 1µA typical
• System VCC: 2.7V to 5.5V operation
• 10KΩ, 2.5KΩ End to end resistance
• 100 yr. data retention
• Endurance: 100,000 data changes per bit per
register
• Low power CMOS
• 24-lead SOIC, 24-lead TSSOP, and
24-lead CSP (Chip Scale Package) Packages
DESCRIPTION
The X9409 integrates 4 digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated microcircuit.
The digitally controlled potentiometer is implemented
using 63 resistive elements in a series array. Between
each element are tap points connected to the wiper
terminal through switches. The position of the wiper on
the array is controlled by the user through the 2-wire
bus interface. Each potentiometer has associated with
it a volatile Wiper Counter Register (WCR) and 4
nonvolatile Data Registers (DR0:DR3) that can be
directly written to and read by the user. The contents
of the WCR controls the position of the wiper on the
resistor array through the switches. Power up recalls
the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC
VSS
WP
SCL
SDA
A0
A1
A2
A3
Interface
and
Control
Circuitry
8
Data
REV 1.6 1/30/03
Pot 0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VH0/RHO
VL0/
RLO
VW0/
RWO
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
VH2/RH2
VL2/RL2
VW2/RW2
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 1
VW1/
RW1
VH1/
RH1
VL1/RL1
www.xicor.com
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
VW3/RW3
VH3/RH3
VL3/RL3
Characteristics subject to change without notice. 1 of 21
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X9409 – Preliminary Information
Figure 3. Two-Byte Instruction Sequence
SCL
SDA
S 0 1 0 1 A3 A2 A1 A0 A I3 I2 I1 I0 R1 R0 P1 P0 A S
T C CT
A K KO
RP
T
The Increment/Decrement command is different from
the other commands. Once the command is issued and
the X9409 has responded with an acknowledge, the
master can clock the selected wiper up and/or down in
one segment steps; thereby, providing a fine tuning
capability to the host. For each SCL clock pulse (tHIGH)
while SDA is HIGH, the selected wiper will move one
resistor segment towards the VH/RH terminal. Similarly,
for each SCL clock pulse while SDA is LOW, the
selected wiper will move one resistor segment towards
the VL/RL terminal. A detailed illustration of the
sequence and timing for this operation are shown in
Figures 5 and 6 respectively.
Table 1. Instruction Set
Instruction Set
Instruction
I3 I2 I1 I0 R1 R0 P1 P0
Operation
Read Wiper Counter
Register
1 0 0 1 0 0 P1 P0 Read the contents of the Wiper Counter
Register pointed to by P1–P0
Write Wiper Counter
Register
1 0 1 0 0 0 P1 P0 Write new value to the Wiper Counter Register
pointed to by P1–P0
Read Data Register
1 0 1 1 R1 R0 P1 P0 Read the contents of the Data Register pointed
to by P1–P0 and R1–R0
Write Data Register
1 1 0 0 R1 R0 P1 P0 Write new value to the Data Register pointed to
by P1–P0 and R1–R0
XFR Data Register to 1 1 0 1 R1 R0 P1 P0 Transfer the contents of the Data Register
Wiper Counter Register
pointed to by P1–P0 and R1–R0 to its associated
Wiper Counter Register
XFR Wiper Counter
Register to Data
Register
Global XFR Data
Registers to Wiper
Counter Registers
1 1 1 0 R1 R0 P1 P0 Transfer the contents of the Wiper Counter
Register pointed to by P1–P0 to the Data
Register pointed to by R1–R0
0 0 0 1 R1 R0 0
0 Transfer the contents of the Data Registers
pointed to by R1–R0 of all four pots to their
respective Wiper Counter Registers
Global XFR Wiper
Counter Registers to
1 0 0 0 R1 R0 0
0 Transfer the contents of both Wiper Counter
Registers to their respective Data Registers
Data Register
pointed to by R1–R0 of all four pots
Increment/Decrement 0 0 1 0 0 0 P1 P0 Enable Increment/decrement of the WCR Latch
Wiper Counter Register
pointed to by P1–P0
Note: (7) 1/0 = data is one or zero
REV 1.6 1/30/03
www.xicor.com
Characteristics subject to change without notice. 5 of 21
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for X9409 electronic component. |
| Information | Total 21 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ X9409.PDF Datasheet ] | |
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