X9448-2.7 XICOR [Xicor Inc.], X9448-2.7 Datasheet - Page 2
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X9448-2.7
Manufacturer Part Number
X9448-2.7
Description
Mixed Signal with 2-Wire Interface
Manufacturer
XICOR [Xicor Inc.]
Datasheet
1.X9448-2.7.pdf
(20 pages)
X9448
PIN DESCRIPTIONS
Host Interface Pins
Serial Clock (SCL)
The SCL input is used to clock data into and out of the
X9448.
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 col-
lector 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 (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 X9448. A maximum of 16 devices may share the
same 2-wire serial bus.
Potentiometer Pins
V
The V
connections on either end of a mechanical potentiometer.
V
The wiper output is equivalent to the wiper output of a
mechanical potentiometer and is connected to the
inverting input of the voltage comparator.
Comparator and Device Pins
Voltage Input V
V
inverting) inputs of the two comparators.
Buffered Voltage Outputs V
The V
comparator outputs enabled by respective bits in the
volatile analog control register.
REV 1.0 6/21/00
H
W
NI0
(V
(V
and V
H0
H
W0
OUT0
–V
and V
–V
H1
NI1
W1
, and V
), V
)
L
are the input voltages to the plus (non-
NI0
L
inputs are equivalent to the terminal
(V
, V
0
–A
L0
OUT1
NI1
–V
3
)
L1
are the buffered voltage
)
OUT0
, V
OUT1
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Hardware Write Protect Input WP
The WP pin when low prevents nonvolatile writes to the
wiper counter and analog control registers.
Analog Supplies V+, V-
The analog supplies V+, V- are the supply voltages for
the XDCP analog section and the voltage comparators.
System Supply V
The system supply V
to bias the interface and control circuits.
PIN CONFIGURATION
V
OUT1
SDA
V
V
SCL
SDA
V
V
V
V
V
V
V
V
V
NC
V
WP
V
NI1
W1
A
H1
SS
A
CC
W0
A1
W1
L1
V-
H0
A
H1
SS
L0
L1
1
3
2
Characteristics subject to change without notice.
CC
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
CC
and Ground V
X9448
X9448
TSSOP
and its reference V
SOIC
24
23
22
21
20
19
18
17
16
15
14
24
23
22
21
20
19
18
17
16
15
14
13
13
SS
V+
V
V
NC
A0
NC
A
SCL
NC
V
V
V-
WP
A
V
V
V
V
NC
V+
V
V
A
NC
OUT0
NI0
3
NI1
OUT1
2
W0
H0
L0
CC
OUT0
NI0
0
SS
is used
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