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X9221AWPI Datasheet(PDF) 1 Page - Intersil Corporation |
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X9221AWPI Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 15 page 1 ® X9221A 64 Taps, 2-Wire Serial Bus Dual Digitally Controlled Potentiometer (XDCP™) FEATURES • Two XDCPs in one package • 2-wire serial interface • Register oriented format, 8 registers total —Directly write wiper position —Read wiper position —Store as many as four positions per pot • Instruction format —Quick transfer of register contents to resistor array • Direct write cell —Endurance–100,000 writes per bit per register • Resistor array values —2k Ω, 10kΩ, 50kΩ • Resolution: 64 taps each pot • 20 Ld plastic DIP and 20-lead SOIC packages • Pb-free plus anneal available (RoHS compliant) DESCRIPTION The X9221A integrates two digitally controlled potenti- ometers (XDCP) on a monolithic CMOS integrated microcircuit. The digitally controlled potentiometer is implemented using 63 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 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 2 non- volatile Data Registers (DR0:DR1) 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 con- tents of DR0 to the WCR. The XDCP can be used as a three-terminal potentiom- eter or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing. BLOCK DIAGRAM R1 R0 R3 R2 VH0/RH0 VL0/RL0 VW0/RW0 Wiper Counter Register (WCR) Register Array Pot 1 Wiper Counter Register (WCR) R1 R0 R3 R2 8 Data SCL SDA A0 A1 A2 A3 Interface and Control Circuitry VCC VSS Pot 0 VH1/RH1 VL1/RL1 VW1/RW1 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. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Data Sheet FN8163.1 September 14, 2005 |
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