X9410_06 Datasheet, PDF (3/21 Pages) Intersil Corporation – Dual Digitally Controlled Potentiometer

X9410
Potentiometer Pins
V_H/R_H (V_H0/R_H0 - V_H1/R_H1), V_L/R_L (V_L0/R_L0 - V_L1/R_L1)
The V_H/R_H and V_L/R_L inputs are equivalent to the terminal
connections on either end of a mechanical potentiometer.
V_W/R_W (V_W0/R_W0 - V_W1/R_W1)
The wiper outputs are equivalent to the wiper output of
a mechanical potentiometer.
Hardware Write Protect Input (WP)
The WP pin when LOW prevents nonvolatile writes to
the Data Registers.
Analog Supplies (V+, V-)
The analog supplies V+, V- are the supply voltages for
the XDCP analog section.
PIN CONFIGURATION
V_CC
V_L0/R_L0
V_H0/R_H0
V_W0/R_W0
CS
WP
SI
A₁
V_L1/R_L1
V_H1/R_H1
V_W1/R_W1
V_SS
DIP/SOIC
1
24
2
23
3
22
4
21
5
20
6
19
X9410
7
18
8
17
9
16
10
15
11
14
12
13
V+
NC
NC
NC
A₀
SO
HOLD
SCK
NC
NC
NC
V-
SI
A₁
V_L1/R_L1
V_H1/R_H1
V_W1/R_W1
V_SS
NC
NC
NC
V-
SCK
HOLD
TSSOP
1
24
2
23
3
22
4
21
5
20
6
19
X9410
7
18
8
17
9
16
10
15
11
14
12
13
WP
CS
V_W0/R_W0
V_H0/R_H0
V_L0/R_L0
V_CC
NC
NC
NC
V+
A₀
SO
PIN NAMES
Symbol
SCK
S_I, S_O
A₀ - A₁
V_H0/R_H0 - V_H1/R_H1,
V_L0/R_L0 - V_L1/R_L1
V_W0/R_W0 - V_W1/R_W1
WP
V+,V-
V_CC
V_SS
NC
Description
Serial Clock
Serial Data
Device Address
Potentiometer Pins
(terminal equivalent)
Potentiometer Pin
(wiper equivalent)
Hardware Write Protection
Analog Supplies
System Supply Voltage
System Ground
No Connection
DEVICE DESCRIPTION
The X9410 is a highly integrated microcircuit
incorporating two resistor arrays and their associated
registers and counters and the serial interface logic
providing direct communication between the host and
the XDCP potentiometers.
Serial Interface
The X9410 supports the SPI interface hardware
conventions. The device is accessed via the SI input
with data clocked in on the rising SCK. CS must be
LOW and the HOLD and WP pins must be HIGH
during the entire operation.
The SO and SI pins can be connected together, since
they have three state outputs. This can help to reduce
system pin count.
Array Description
The X9410 is comprised of two resistor arrays. Each
array contains 63 discrete resistive segments that are
connected in series. The physical ends of each array
are equivalent to the fixed terminals of a mechanical
potentiometer (V_H/R_H and V_L/R_L inputs).
At both ends of each array and between each resistor
segment is a CMOS switch connected to the wiper
(V_W/R_W) output. Within each individual array only one
switch may be turned on at a time.
These switches are controlled by a Wiper Counter
Register (WCR). The six bits of the WCR are decoded
to select, and enable, one of sixty-four switches.
3
FN8193.2
October 12, 2006