X9401| Datasheet

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X9401
Low Noise/Low Power/SPI Bus
Data Sheet October 12, 2006 FN8190.3

Quad, 64 Tap, Digitally Controlled Potentiometer (XDCPTM)
FEATURES Quad 4 separate pots, 64 taps/pot Nonvolatile storage of wiper position Four Nonvolatile Data Registers for Each Pot 16-bytes of EEPROM memory SPI serial interface RTotal = 10k Wiper resistance = 150 typical Standby current < 1uA (total package) Operating current < 400uA max. VCC = 2.7V to 5V Package 24 Ld SOIC 100 year data retention Pb-free plus anneal available (RoHS compliant)

DESCRIPTION The X9401 integrates 4 digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 64 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the SPI bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array through the switches. Power-up recalls the contents of DR0 to the WCR. The XDCP 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.

BLOCK DIAGRAM
VCC VSS R0 R1 Pot 0 Wiper Counter Register (WCR) VH0/RH0 R0 R1 Wiper Counter Register (WCR) VH2/RH2

HOLD CS SCK SO SI A0 A1 WP Interface and Control Circuitry Data

R2 R3

VL0/RL0 VW0/RW0

R2 R3

Resistor Array Pot 2

VL2/RL2 VW2/RW2

8 VW1/RW1 R0 R1 Wiper Counter Register (WCR) Resistor Array Pot 1 VH1/RH1 R0 R1 Wiper Counter Register (WCR) VW3/RW3 VH3/RH3

R2 R3

VL1/RL1

R2 R3

Resistor Array Pot 3

VL3/RL3

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.