CAT5419_13 Datasheet, PDF (2/15 Pages) ON Semiconductor – Dual Digital Potentiometer (POT)

CAT5419
R_H0 R_H1
SCL
SDA
2−WIRE BUS
INTERFACE
WIPER
CONTROL
REGISTERS
R_W0
WP
R_W1
A0
A1
A2
A3
CONTROL
LOGIC
NONVOLATILE
DATA
REGISTERS
Figure 1. Functional Diagram ^{RL0 RL1}
PIN DESCRIPTIONS
SCL: Serial Clock
The CAT5419 serial clock input pin is used to clock all
data transfers into or out of the device.
SDA: Serial Data
The CAT5419 bidirectional serial data pin is used to
transfer data into and out of the device. The SDA pin is an
open drain output and can be wire-OR’d with the other open
drain or open collector outputs.
A0, A1, A2, A3: Device Address Inputs
These inputs set the device address when addressing
multiple devices. A total of sixteen devices can be addressed
on a single bus. A match in the slave address must be made
with the address input in order to initiate communication
with the CAT5419.
R_H, R_L: Resistor End Points
The R_H and R_L pins are equivalent to the terminal
connections on a mechanical potentiometer.
R_W: Wiper
The R_W pins are equivalent to the wiper terminal of a
mechanical potentiometer.
WP: Write Protect Input
The WP pin when tied low prevents non-volatile writes to
the data registers (change of wiper control register is
allowed) and when tied high or left floating normal
read/write operations are allowed. See page 8, Write
Protection for more details.
Table 1. PIN CONNECTIONS
Pin
SOIC
Pin
TSSOP
Name
Function
1
19
V_CC
Supply Voltage
2
20
R_L0
Low Reference Terminal
for Potentiometer 0
3
21
R_H0
High Reference Terminal
for Potentiometer 0
4
22
R_W0
Wiper Terminal for
Potentiometer 0
5
23
A2
Device Address
6
24
WP
Write Protection
7
1
SDA
Serial Data Input/Output
8
2
A1
Device Address
9
3
R_L1
Low Reference Terminal
for Potentiometer 1
10
4
R_H1
High Reference Terminal
for Potentiometer 1
11
5
R_W1
Wiper Terminal for
Potentiometer 1
12
6
GND Ground
13
7
NC
No Connect
14
8
NC
No Connect
15
9
NC
No Connect
16
10
NC
No Connect
17
11
SCL
Bus Serial Clock
18
12
A3
Device Address
19
13
NC
No Connect
20
14
A0
Device Address, LSB
21
15
NC
No Connect
22
16
NC
No Connect
23
17
NC
No Connect
24
18
NC
No Connect
http://onsemi.com
2