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ISL23325 Datasheet

Low Voltage Digitally Controlled Potentiometer

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DATASHEET
ISL23325
Dual, 256-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)
FN7870
Rev 1.00
September 23, 2015
The ISL23325 is a volatile, low voltage, low noise, low power,
256-Tap, dual digitally controlled potentiometer (DCP) with an
I2C Bus™ interface. It integrates two DCP cores, wiper switches
and control logic on a monolithic CMOS integrated circuit.
Each 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. Each potentiometer has an associated volatile
Wiper Register (WRi, i = 0, 1) that can be directly written to and
read by the user. The contents of the WRi controls the position
of the wiper. When powered on, the wiper of each DCP will
always commence at mid-scale (128 tap position).
The low voltage, low power consumption, and small package
of the ISL23325 make it an ideal choice for use in battery
operated equipment. In addition, the ISL23325 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 ISL23325 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.
Applications
• Power supply margining
• Trimming sensor circuits
• Gain adjustment in battery powered instruments
• RF power amplifier bias compensation
Features
• Two potentiometers per package
• 256 resistor taps
• 10kΩ 50kΩ or 100kΩ total resistance
• I2C serial interface
- No additional level translator for low bus supply
- Three address pins allow up to eight devices per bus
• Maximum supply current without serial bus activity
(standby)
- 3µA @ VCC and VLOGIC = 5V
- 1.7µA @ VCCand VLOGIC = 1.7V
• Shutdown Mode
- Forces the DCP into an end-to-end open circuit and RWi is
connected to RLi internally
- Reduces power consumption by disconnecting the DCP
resistor from the circuit
• 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
• Power-on preset to mid-scale (128 tap position)
• Extended industrial temperature range: -40°C to +125°C
• 14 Ld TSSOP or 16 Ld µTQFN packages
• Pb-free (RoHS Compliant)
10000
8000
6000
4000
2000
0
0 64 128 192 256
TAP POSITION (DECIMAL)
FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP
POSITION, 10kDCP
VREF
RH1
1 DCP
OF
ISL23325
RW1
RL1
-
+
ISL28114
VREF_M
FIGURE 2. VREF ADJUSTMENT
FN7870 Rev 1.00
September 23, 2015
Page 1 of 20


Renesas Electronics Components Datasheet

ISL23325 Datasheet

Low Voltage Digitally Controlled Potentiometer

No Preview Available !

ISL23325
Block Diagram
VLOGIC
VCC
RH0
RH1
SCL
SDA
A0
A1
A2
I/O
BLOCK
LEVEL
SHIFTER
POWER UP
INTERFACE,
CONTROL
AND
STATUS
LOGIC
WR0
VOLATILE
REGISTER
AND
WIPER
CONTROL
CIRCUITRY
WR1
VOLATILE
REGISTER
AND
WIPER
CONTROL
CIRCUITRY
Pin Configurations
ISL23325
(14 LD TSSOP)
TOP VIEW
GND 1
VLOGIC 2
SDA 3
SCL 4
A0 5
A1 6
A2 7
14 VCC
13 RL0
12 RW0
11 RH0
10 RH1
9 RW1
8 RL1
ISL23325
(16 LD µTQFN)
TOP VIEW
GND
SDA 1
SCL 2
A0 3
A1 4
12 RW0
11 RH0
10 RH1
9 RW1
RW0 RL0
RW1 RL1
Pin Descriptions
TSSOP
1
2
µTQFN
6, 15
16
31
42
53
64
75
88
99
10 10
11 11
12 12
13 13
14 14
7
SYMBOL
DESCRIPTION
GND
VLOGIC
Ground pin
I2C bus/logic supply. Range 1.2V to
5.5V
SDA Logic Pin - Serial bus data
input/open drain output
SCL Logic Pin - Serial bus clock input
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
A2 Logic Pin - Hardwire slave address
pin for I2C serial bus.
Range: VLOGIC or GND
RL1 DCP1 “low” terminal
RW1 DCP1 wiper terminal
RH1 DCP1 “high” terminal
RH0 DCP0 “high” terminal
RW0 DCP0 wiper terminal
RL0 DCP0 “low” terminal
VCC Analog power supply.
Range 1.7V to 5.5V
NC Not Connected
FN7870 Rev 1.00
September 23, 2015
Page 2 of 20


Part Number ISL23325
Description Low Voltage Digitally Controlled Potentiometer
Maker Renesas
Total Page 20 Pages
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