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ISL23318 Datasheet

128-taps Low Voltage Digitally Controlled Potentiometer

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DATASHEET
ISL23318
Single, 128-taps Low Voltage Digitally Controlled Potentiometer (XDCP™)
FN7887
Rev 0.00
July 26, 2011
The ISL23318 is a volatile, low voltage, low noise, low power,
I2C Bus™, 128 Taps, single digitally controlled potentiometer
(DCP), which integrates DCP core, wiper switches and control
logic on a monolithic CMOS integrated circuit.
The digitally controlled potentiometer is 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. The potentiometer has an associated
volatile Wiper Register (WR) that can be directly written to and
read by the user. The contents of the WR controls the position
of the wiper. When powered on, the ISL23318’s wiper will
always commence at mid-scale (64 tap position).
The low voltage, low power consumption, and small package
of the ISL23318 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23318 has a VLOGIC
pin allowing down to 1.2V bus operation, independent from the
VCC value. This allows for low logic levels to be connected
directly to the ISL23318 without passing through a voltage
level shifter.
The DCP can be used as a three-terminal potentiometer or as a
two-terminal variable resistor in a wide variety of applications
including control, parameter adjustments, and signal
processing.
Features
• 128 resistor taps
• I2C serial interface
- No additional level translator for low bus supply
- Two address pins allow up to four devices per bus
• Power supply
- VCC = 1.7V to 5.5V analog power supply
- VLOGIC = 1.2V to 5.5V I2C bus/logic power supply
• Wiper resistance: 70Ω typical @ VCC = 3.3V
• Shutdown Mode - forces the DCP into an end-to-end open
circuit and RW is shorted to RL internally
• Power-on preset to mid-scale (64 tap position)
• Shutdown and standby current <2.8µA max
• DCP terminal voltage from 0V to VCC
• 10kΩ50kΩor 100kΩ total resistance
• Extended industrial temperature range: -40°C to +125°C
• 10 Ld MSOP or 10 Ld UTQFN packages
• Pb-free (RoHS compliant)
Applications
• Gain adjustment in battery powered instruments
• Trimming sensor circuits
• Power supply margining
• RF power amplifier bias compensation
10000
8000
6000
4000
2000
0
0 32 64 96 128
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10k DCP
VREF
RH
ISL23318
RW
RL
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
FN7887 Rev 0.00
July 26, 2011
Page 1 of 19


Renesas Electronics Components Datasheet

ISL23318 Datasheet

128-taps Low Voltage Digitally Controlled Potentiometer

No Preview Available !

ISL23318
Block Diagram
VLOGIC
SCL
SDA
A1
A0
I/O
BLOCK
LEVEL
SHIFTER
Pin Configurations
ISL23318
(10 LD MSOP)
TOP VIEW
VLOGIC
SCL
SDA
A0
A1
1
2
3
4
5
10
9
8
7
6
GND
VCC
RH
RW
RL
ISL23318
(10 LD UTQFN)
TOP VIEW
SCL 1
SDA 2
A0 3
A1 4
9 GND
8 VCC
7 RH
6 RW
VCC
POWER-UP
INTERFACE,
CONTROL
AND
STATUS
LOGIC
WR
VOLATILE
REGISTER
AND
WIPER
CONTROL
CIRCUITRY
RH
GND
RL
RW
Pin Descriptions
MSOP
1
UTQFN
10
21
32
43
54
65
76
87
98
10 9
SYMBOL
VLOGIC
DESCRIPTION
I2C bus /logic supply. Range 1.2V to
5.5V
SCL Logic Pin - Serial bus clock input
SDA Logic Pin - Serial bus data
input/open drain output
A0 Logic Pin - Hardwire slave address
pin for I2C serial bus.
Range: VLOGIC or GND
A1 Logic Pin - Hardwire slave address
pin for I2C serial bus.
Range: VLOGIC or GND
RL DCP “low” terminal
RW DCP wiper terminal
RH DCP “high” terminal
VCC Analog power supply.
Range 1.7V to 5.5V
GND Ground pin
FN7887 Rev 0.00
July 26, 2011
Page 2 of 19


Part Number ISL23318
Description 128-taps Low Voltage Digitally Controlled Potentiometer
Maker Renesas
Total Page 19 Pages
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