x9438 Intersil Corporation, x9438 Datasheet - Page 2

• Manufacturer Part Number: x9438
• Description: Dual Digitally Controlled Potentiometer Xdcp With Operational Amplifier
• Manufacturer: Intersil Corporation

PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9438.
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.
Device Address (A
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 X9438. A maximum of 16 devices may share the
same 2-wire serial bus.
Potentiometer Pins
R
The R
nections on either end of a mechanical potentiometer.
R
The wiper output is equivalent to the wiper output of a
mechanical potentiometer.
Amplifier and Device Pins
Amplifier Input Voltage V
V
inverting (-) inputs of the operational amplifiers.
Amplifier Output Voltage V
V
amplifier.
Hardware Write Protect Input WP
The WP pin, when low, prevents non-volatile writes to
the wiper counter registers.
Note:
NI
OUT
H
W
(R
(R
and V
H0
H
W0
(1) Alternate designations for R
is the voltage output pin of the operational
and R
- R
- R
INV
H1
W1
L
), R
are inputs to the noninverting (+) and
inputs are equivalent to the terminal con-
)
L
(R
0
(1)
- A
L0
3
- R
)
NI
2
L1
(0,1) and V
OUT
)
H
(0,1)
, R
L
, R
W
are V
INV
(0,1)
H
, V
L
, V
W
X9438
Analog Supplies V+, V-
The analog supplies V+, V- are the supply voltages for
the XDCP analog section and the operational amplifiers.
System Supply V
The system supply V
to bias the interface and control circuits.
PIN CONFIGURATION
PIN NAMES
SDA
R
R
V
R
R
R
R
WP
V
SCL
SDA
A0 - A3
R
R
R
V
V
V
WP
V+,V-
V
V
NC
CC
W0
A1
W1
A
H0
H1
L0
L1
SS
NI(0,1)
INV(0,1)
OUT0,
CC
SS
H0
L0
W0
2
Symbol
- R
- R
- R
1
2
3
4
5
6
7
8
9
10
11
12
,
L1
V
H1
W1
OUT1
X9438
SOIC
,
14
13
24
23
22
21
20
19
18
17
16
15
CC
Serial Clock
Serial Data
Device Address
Potentiometers (terminal equivalent)
Potentiometers (wiper equivalent)
Amplifier Input Voltages
Amplifier Outputs
Hardware Write Protection
Analog and Voltage Amplifier Supplies
System/Digital Supply Voltage
System Ground
No Connection
V+
V
V
V
A0
NC
A
SCL
V
V
V
V-
CC
and Ground V
OUT0
NI0
INV0
3
INV1
NI1
OUT1
and its reference V
V
V
OUT0
V
INV0
R
V
R
R
WR
NC
NI0
A
V+
W0
Description
CC
A
H0
L0
0
2
1
2
3
4
5
6
7
8
9
10
11
12
SS
TSSOP
X9438
.
13
14
24
23
22
21
20
19
18
17
16
15
SS
March 11, 2005
is used
FN8199.0
A
SCL
V
V
V
V-
V
R
R
R
A
SDA
3
INV1
NI1
OUT1
SS
1
W1
H1
L1