X9408_09 Datasheet, PDF (3/20 Pages) Intersil Corporation – Quad Digitally Controlled (XDCP™) 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