Dual, 128-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP) ISL23328 Features Two potentiometers per package The ISL23328 is a volatile, low voltage, low noise, low power, 128-Tap, dual digitally controlled potentiometer (DCP) with an 128 resistor taps 2 I C Bus interface. It integrates two DCP cores, wiper switches 10k , 50k or 100k total resistance and control logic on a monolithic CMOS integrated circuit. 2 I C serial interface Each digitally controlled potentiometer is implemented with a - No additional level translator for low bus supply combination of resistor elements and CMOS switches. The 2 - Three address pins allow up to eight devices per bus position of the wipers are controlled by the user through the I C bus interface. Each potentiometer has an associated volatile Power supply Wiper Register (WRi, i = 0, 1) that can be directly written to and -V = 1.7V to 5.5V analog power supply CC read by the user. The contents of the WRi controls the position 2 -V = 1.2V to 5.5V I C bus/logic power supply LOGIC of the wiper. When powered on, the wiper of each DCP will always commence at mid-scale (64 tap position). Maximum supply current without serial bus activity (standby) The low voltage, low power consumption, and small package - 3A V and V = 5V of the ISL23328 make it an ideal choice for use in battery CC LOGIC operated equipment. In addition, the ISL23328 has a V - 1.7A V and V = 1.7V LOGIC CC LOGIC pin allowing down to 1.2V bus operation, independent from the Shutdown Mode V value. This allows for low logic levels to be connected CC - Forces the DCP into an end-to-end open circuit and RWi is directly to the ISL23328 without passing through a voltage connected to RLi internally level shifter. - Reduces power consumption by disconnecting the DCP The DCP can be used as a three-terminal potentiometer or as a resistor from the circuit two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal Wiper resistance: 70 typical V = 3.3V CC processing. Power-on preset to mid-scale (64 tap position) Extended industrial temperature range: -40C to +125C Applications 14 Ld TSSOP or 16 Ld UTQFN packages Power supply margining Pb-free (RoHS Compliant) Trimming sensor circuits Gain adjustment in battery powered instruments RF power amplifier bias compensation 10000 V REF 8000 6000 RH1 - V REF M 4000 1 DCP RW1 OF + ISL23328 ISL28114 2000 RL1 0 032 64 96 128 TAP POSITION (DECIMAL) FIGURE 1. FORWARD AND BACKWARD RESISTANCE vs TAP FIGURE 2. V ADJUSTMENT REF POSITION, 10k DCP August 19, 2011 CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas Inc. 2011. All Rights Reserved FN7902.0 Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners RESISTANCE ( )ISL23328 Block Diagram V V RH0 RH1 LOGIC CC SCL POWER UP SDA INTERFACE, LEVEL I/O CONTROL WR0 A0 SHIFTER WR1 BLOCK AND VOLATILE VOLATILE A1 STATUS REGISTER REGISTER LOGIC A2 AND AND WIPER WIPER CONTROL CONTROL CIRCUITRY CIRCUITRY GND RW0 RL0 RW1 RL1 Pin Configurations Pin Descriptions ISL23328 (14 LD TSSOP) TSSOP UTQFN SYMBOL DESCRIPTION TOP VIEW 1 6, 15 GND Ground pin 2 216 V I C bus/logic supply. Range 1.2V to GND 1 14 V LOGIC CC 5.5V V 2 13 RL0 LOGIC 3 1 SDA Logic Pin - Serial bus data SDA 3 12 RW0 input/open drain output SCL 4 11 RH0 4 2 SCL Logic Pin - Serial bus clock input A0 5 10 RH1 5 3 A0 Logic Pin - Hardwire slave address 2 pin for I C serial bus. A1 6 9 RW1 Range: V or GND LOGIC 8 A2 7 RL1 6 4 A1 Logic Pin - Hardwire slave address 2 pin for I C serial bus. Range: V or GND LOGIC ISL23328 (16 LD UTQFN) 7 5 A2 Logic Pin - Hardwire slave address 2 TOP VIEW pin for I C serial bus. Range: V or GND LOGIC 8 8 RL1 DCP1 low terminal 9 9 RW1 DCP1 wiper terminal SDA 1 12 RW0 10 10 RH1 DCP1 high terminal SCL 2 11 RH0 11 11 RH0 DCP0 high terminal A0 3 10 RH1 12 12 RW0 DCP0 wiper terminal A1 4 9 RW1 13 13 RL0 DCP0 low terminal 14 14 V Analog power supply. CC Range 1.7V to 5.5V 7NC Not Connected FN7902.0 2 August 19, 2011 A2 5 16 V LOGIC GND 6 15 GND NC 7 14 V CC RL1 8 13 RL0