X9409 Datasheet, PDF (2/21 Pages) Xicor Inc. – Quad Digitally Controlled Potentiometers

X9409 – Preliminary Information
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9409.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. It is an open drain output and
may be wire-ORed with any number of open drain or
open collector outputs. An open drain output requires
the use of a pull-up resistor. For selecting typical
values, refer to the guidelines for calculating typical
values on the bus pull-up resistors graph.
Device Address (A₀–A₃)
The address inputs are used to set the least significant
4 bits of the 8-bit slave address. A match in the slave
address serial data stream must be made with the
address input in order to initiate communication with
the X9409. A maximum of 16 devices may occupy the
2-wire serial bus.
Potentiometer Pins
V_H0/R_H0–V_H3/R_H3, V_L0/R_L0–V_L3/R_L3
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_W0/R_W0–V_W3/R_W3
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.
PIN NAMES
Symbol
SCL
SDA
A0-A3
V_H0/R_H0–V_H3/R_H3,
V_L0/R_L0–V_L3/R_L3
V_W0/R_W0–V_W3/R_W3
WP
V_CC
V_SS
NC
Description
Serial Clock
Serial Data
Device Address
Potentiometer Pin
(terminal equivalent)
Potentiometer Pin
(wiper equivalent)
Hardware Write Protection
System Supply Voltage
System Ground (Digital)
No Connection
PIN CONFIGURATION
V_CC
V_L0/R_L0
V_H0/R_H0
V_W0/R_W0
A₂
WP
SDA
A₁
V_L1/R_L1
V_H1/R_H1
V_W1/R_W1
V
SS
SOIC
1
24
2
23
3
22
4
21
5
20
6
19
X9409
7
18
8
17
9
16
10
15
11
14
12
13
CSP
NC
V_L3/R_L3
V_H3/R_H3
V_W3/R_W3
A₀
NC
A₃
SCL
V_L2/R_L2
V_H2/R_H2
V_W2/R_W2
1
2
3
4
A ^VW0/RW0
A₂
A₁ V_L1/R_L1
V_L0/R_L0 WP
B
SDA V_W1/R_W1
V_CC V_H0/R_H0 V_H1/R_H1 V_SS
C
NC VH3/RH3 VH2/RH2 NC
D
V_L3/R_L3 NC
E
A₃ V_W2/R_W2
V_W3/R_W3 A ₀
F
SCL V_L2/R_L2
NC
Top View–Bumps Down
SDA
A₁
V_L1/R_L1
V_H1/R_H1
V_W1/R_W1
V_SS
NC
V_W2/R_W2
V_H2/R_H2
V_L2/R_L2
SCL
A₃
TSSOP
1
24
2
23
3
22
4
21
5
20
6
19
X9409
7
18
8
17
9
16
10
15
11
14
12
13
WP
A₂
V_W0/R_W0
V_H0/R_H0
V_L0/R_L0
V_CC
NC
V_L3/R_L3
V_H3/R_H3
V_W3/R_W3
A₀
NC
REV 1.6 1/30/03
www.xicor.com
Characteristics subject to change without notice. 2 of 21