X9408_14 Datasheet, PDF (3/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

X9408
Pin Descriptions
Host Interface Pins
SERIAL CLOCK (SCL)
The SCL input is used to clock data into and out of the
X9408.
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 X9408. A maximum
of 16 devices may occupy the 2-wire serial bus.
Potentiometer Pins
V_H/R_H (V_H0/R_H0 - V_H3/R_H3), V_L/R_L (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_W/R_W (V_W0/R_W0 – V_W3/R_W3)
The wiper outputs are equivalent to the wiper output of a
mechanical potentiometer.
Pinouts
X9408
(24 LD DIP/SOIC)
TOP VIEW
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 Assignments
SYMBOL
DESCRIPTION
SCL
Serial Clock
SDA
Serial Data
A0-A3
Device Address
V_H0/R_H0 - V_H3/R_H3, V_L0/R_L0 Potentiometer Pins
- V_L3/R_L3
(terminal equivalent)
V_W0/R_W0 - V_W3/R_W3
Potentiometer Pins
(wiper equivalent)
WP
Hardware Write Protection
V+,V-
Analog Supplies
V_CC
V_SS
NC
System Supply Voltage
System Ground
No Connection
X9408
(24 LD TSSOP)
TOP VIEW
V_CC 1
V_L0/R_L0 2
V_H0/R_H0 3
V_W0/R_W0 4
A₂ 5
WP 6
SDA 7
A₁ 8
V_L1/R_L1 9
V_H1/R_H1 10
V_W1/R_W1 11
V_SS 12
24 V+
23 V_L3/R_L3
22 V_H3/R_H3
21 V_W3/R/R_H1
20 A₀
19 NC
18 A₃
17 SCL
16 V_L2/R_L2
15 V_H2/R_H2
14 V_W2/R_W2
13 V-
SDA 1
A₁ 2
V_L1/R_L1 3
V_H1/R_H1 4
V_W1/R_W1 5
V_SS 6
V- 7
V_W2/R_W2 8
V_H2/R_H2 9
V_L2/R_L2 10
SCL 11
A₃ 12
24 WP
23 A₂
22 V_W0/R_W0
21 V_H0/R_H0
20 V_L0/R_L0
19 V_CC
18 V+
17 V_L3/R_L3
16 V_H3/R_H3
15 V_W3/R_W3
14 A₀
13 NC
3
FN8191.4
January 15, 2009