ISL22346_14 Datasheet, PDF (1/16 Pages) Intersil Corporation – Low Noise, Low Power I2C™ Bus,128 Taps

ISL22346
®
Quad Digitally Controlled Potentiometers (XDCP™)
Data Sheet
September 3, 2009
FN6177.2
Low Noise, Low Power I²C^™ Bus,
128 Taps
The ISL22346 integrates four digitally controlled potentiometers
(DCP) and non-volatile memory on a monolithic CMOS
integrated circuit.
The digitally controlled potentiometers are implemented with
a combination of resistor elements and CMOS switches. The
position of the wipers are controlled by the user through the
I²C bus interface. Each potentiometer has an associated
volatile Wiper Register (WR) and a non-volatile Initial Value
Register (IVR) that can be directly written to and read by the
user. The contents of the WR controls the position of the
wiper. At power-up the device recalls the contents of the two
DCP’s IVR to the corresponding WRs.
The DCPs can be used as a three-terminal potentiometers
or as a two-terminal variable resistors in a wide variety of
applications including control, parameter adjustments, and
signal processing.
Pinouts
ISL22346
(20 LD TSSOP)
TOP VIEW
RH3 1
RL3 2
RW3 3
A2 4
SCL 5
SDA 6
GND 7
RW2 8
RL2 9
RH2 10
20 RW0
19 RL0
18 RH0
17 SHDN
16 VCC
15 A1
14 A0
13 RH1
12 RL1
11 RW1
Features
• Four potentiometers in one package
• 128 resistor taps
• I²C serial interface
- Three address pins, up to eight devices/bus
• Non-volatile storage of wiper position
• Wiper resistance: 70Ω typical @ V_CC = 3.3V
• Shutdown mode
• Shutdown current 5µA max
• Power supply: 2.7V to 5.5V
• 50kΩ or 10kΩ total resistance
• High reliability
- Endurance: 1,000,000 data changes per bit per register
- Register data retention: 50 years @ T < +55°C
• 20 Ld TSSOP or 20 Ld TQFN package
• Pb-free (RoHS compliant)
ISL22346
(20 LD TQFN)
TOP VIEW
O 20 19 18 17 16
RL0 1
RW0 2
RH3 3
RL3 4
RW3 5
15 RH1
14 ^RL1
13 RW1
12 RH2
11 RL2
6 7 8 9 10
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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