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X9221 데이터시트(PDF) 1 Page - Xicor Inc. |
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X9221 데이터시트(HTML) 1 Page - Xicor Inc. |
1 / 14 page X9221 1 Dual E2POT™ Nonvolatile Digital Potentiometer © Xicor, Inc. 1994, 1995, 1996 Patents Pending. Characteristics subject to change without notice 3079-1.6 6/12/96 T1/C1/D0 NS FEATURES • Two E2POTs in One Package • Two-Wire Serial Interface • Register Oriented Format —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 • Low Power CMOS • Direct Write Cell —Endurance - 100,000 Writes per Register —Register Data Retention - 100 years • 8 Bytes of E2PROM memory • 3 Resistor Array Values —2K Ω to 50KΩ Mask Programmable • Resolution: 64 Taps each Pot • 20-Lead Plastic DIP and 20-Lead SOIC Packages Advance Information X9221 DESCRIPTION The X9221 integrates two nonvolatile E2POT™ digitally controlled potentiometers on a monolithic CMOS micro- circuit. The X9221 contains two resistor arrays, each com- posed of 63 resistive elements. Between each element and at either end are tap points accessible to the wiper elements. The position of the wiper element on the array is controlled by the user through the two-wire serial bus interface. Each resistor array has associated with it a wiper counter register and four 8-bit data registers that can be directly written and read by the user. The contents of the wiper counter register control the position of the wiper on the resistor array. The data register may be read or written by the user. The contents of the data registers can be transferred to the wiper counter register to position the wiper. The current wiper position can be transferred to any one of its associated data registers. FUNCTIONAL DIAGRAM Terminal Voltage ±5V, 64 Taps R0 R1 R2 R3 WIPER COUNTER REGISTER (WCR) RESISTOR ARRAY POT 1 VH1 VL1 VW1 R0 R1 R2 R3 WIPER COUNTER REGISTER (WCR) INTERFACE AND CONTROL CIRCUITRY SCL SDA A0 A1 A2 A3 VH0 VL0 VW0 DATA 3079 ILL F07.1 8 APPLICATION NOTES A V AILABLE AN20 • AN42 • AN44–48 • AN50 • AN52 • AN53 • AN73 |
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