Table of Contents Section 1 – New and Featured Products

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Signal Conditioning/Calibration and Control Products ® X9251 Quad Digitally-Controlled (XDCP ) Potentiometer Product Highlights • Single Supply • Low Power • 256-Tap • SPI Bus • Non-volatile Digital Potentiometer Key Features • Quad–Four Separate Potentiometers • 256 resistor taps/pot–0.4% resolution • SPI Serial Interface for write, read, and transfer operations of the potentiometer • Wiper Resistance, 100Ω typical @ V CC = 5V • Single Supply version of X9250 • Endurance: 100,000 Data Changes per Bit per Register • 24-Lead SOIC, 24-Lead TSSOP, 24-Lead CSP (Chip Scale Package) • Low Power CMOS Benefits • Digital Programmability • Set and Forget Calibration • Reliability • Dynamic Controls — Real time calibration — Adaptive response • Non-volatile storage and recall of wiper position • Power On Recall circuits • General purpose EEPROM Block Diagram Description The X9251 integrates 4 digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit. The digital controlled potentiometer is implemented using 255 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 four nonon-volatile Data Registers 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 though the switches. Power-up recalls the contents of the default Data Register (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. Pin Configuration SOIC/TSSOP SO A0 R W3 R H3 R L3 NC V CC R L0 1 2 3 4 5 6 7 8 X9251 24 23 22 21 20 19 18 17 R H0 R W0 9 10 16 15 CS 11 14 WP 12 13 HOLD SCK R L2 R H2 R W2 NC V SS R W1 R H1 R L1 A1 SI New & Featured Products V CC R H0 R H1 R H2 R H3 SPI Bus Interface Address Data Status Bus Interface & Control Write Read Transfer Inc/Dec Control Power On Recall Wiper Counter Register (WCR) Data Registers (DR0-DR3) V SS R W0 R L0 R W1 R L1 R W2 R L2 R W3 R L3 50KΩ or 100KΩ versions * for ordering information refer to page 1-45 See Product Family Tree on page 2-1 www.xicor.com 1–29
® Signal Conditioning/Calibration and Control Products X9252 Quad Digitally-Controlled (XDCP ) Potentiometer Product Highlights • Dynamic Calibration: Coarse & Fine Tuning — Serial 2-Wire bus — Up/Down Interface • Non-volatile Digital Potentiometer • Low Power • Quad 256-tap Key Features • Quad Solid State Potentiometer • 2-wire Serial Interface for Write, Read, and Transfer Operations of the Potentiometer • Up/Down Interface for Individual Potentiometers • Non-Volatile Storage of Wiper Positions • Power On Recall. Loads Saved Wiper Position on Power-Up • V CC : 2.7V to 5.5V Operation • 2.8kΩ, 10kΩ, 50kΩ, 100kΩ Version of Total Pot Resistance Benefits • Digital Programmability • Set and Forget Calibration • Reliability • Dynamic Controls — Real time calibration — Adaptive response • Non-volatile storage and recall of wiper position • Power On Recall circuits • General purpose EEPROM Block Diagram Description The X9252 integrates 4 digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit. The digital controlled potentiometer is implemented using 255 resistive elements in a series array. Between each element are tap points connected to wiper terminals through switches. The position of each wiper on the array is controlled by the user through the Up/Down or 2-wire bus interface. Each potentiometer wiper has associated with it a volatile Wiper Counter Register (WCR) and four non-volatile Data Registers 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 though the switches. Powerup recalls the contents of the default data register (DR00, DR10, DR20, DR30 ) to each WCR, respectively. The DCP can be used as a three-terminal potentiometer or as a two terminal variable resistor network in a wide variety of applications including the programming of bias voltages, and implementing ladder networks and three resistor programmable networks. Pin Configuration TSSOP DS0 1 24 DS1 A0 R W3 2 3 23 22 SCL R L2 R H3 4 21 R H2 R L3 5 20 R W2 U/D 6 19 CS X9252 V CC 7 18 V SS R L0 8 17 R W1 R H0 RW0 9 10 16 15 R H1 R L1 A2 11 14 A1 WP 12 13 SDA V CC R H0 R H1 R H2 R H3 A2 A1 A0 SDA SCL DS0 2-Wire Interface Up-Down Interface POWER UP, INTERFACE CONTROL AND STATUS WCR0 DR00 DR01 DR02 DR03 DCP0 WCR1 DR10 DR11 DR12 DR13 DCP1 WCR2 DR20 DR21 DR22 DR23 DCP2 WCR3 DR30 DR31 DR32 DR33 DCP3 DS1 CS U/D V SS WP R W0 R L0 R W1 R L1 R W2 R L2 R W3 R L3 * for ordering information refer to page 1-45 1–30 See Product Family Tree on page 2-1 www.xicor.com
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Page 3 and 4: Product Family Selection Trees and
Page 5 and 6: CPU Supervisors, System Management,
Page 7 and 8: ® CPU Supervisors, System Manageme
Page 17 and 18: Power Management Products [Hotswap,
Page 19 and 20: ® Power Management Products [Hotsw
Page 27 and 28: ® Signal Conditioning/Calibration
Page 31: ® Signal Conditioning/Calibration
Page 41 and 42: Signal Conditioning/Calibration and
Page 63 and 64: Voltage Reference Products ® X6000
Page 71 and 72: ® Voltage Reference Products X6400
Page 73: ® Data Conversion Products X79000

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