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DP7251 Datasheet(PDF) 1 Page - Copal Electronics |
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DP7251 Datasheet(HTML) 1 Page - Copal Electronics |
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1 / 15 page  DP7251 © NIDEC COPAL ELECTRONICS CORP. 1 Doc. No. MD-2017 Rev. F Characteristics subject to change without notice Quad Digital Potentiometer (DP) with 256 Taps and SPI Interface FEATURES Four linear-taper digital potentiometers 254 resistor taps per potentiometer End to end resistance 50k or 100k Potentiometer control and memory access via SPI interface Low wiper resistance, typically 100 Nonvolatile memory storage for up to four wiper settings for each potentiometer Automatic recall of saved wiper settings at power up 2.5 to 6.0 volt operation Standby current less than 1µA 1,000,000 nonvolatile WRITE cycles 100 year nonvolatile memory data retention SOIC 24-lead and TSSOP 24-lead Industrial temperature range For Ordering Information details, see page 14. PIN CONFIGURATION SOIC 24-Lead (W) TSSOP 24-Lead (Y) SO 124 HOLD ¯¯¯¯¯ A0 223 SCK RW3 322 RL2 RH3 421 RH2 RL3 520 RW2 NC 619 NC VCC 718 GND RLO 817 RW1 RHO 916 RH1 RWO 10 15 RL1 CS ¯¯¯ 11 14 A1 WP ¯¯¯ 12 13 SI DP 7251 DESCRIPTION The DP7251 is four Digital Potentiometers (DPs) integrated with control logic and 16 bytes of NVRAM memory. Each DP consists of a series of resistive elements connected between two externally accessible end points. The tap points between each resistive element are connected to the wiper outputs with CMOS switches. A separate 8-bit control register (WCR) independently controls the wiper tap switches for each DP. Associated with each wiper control register are four 8-bit non-volatile memory data registers (DR) used for storing up to four wiper settings. Writing to the wiper control register or any of the non-volatile data registers is via a SPI serial bus. On power-up, the contents of the first data register (DR0) for each of the four potentiometers is automatically loaded into its respective wiper control register. The DP7251 can be used as a potentiometer or as a two terminal, variable resistor. It is intended for circuit level or system level adjustments in a wide variety of applications. It is available in the -40°C to 85°C industrial operating temperature range and offered in a 24-lead SOIC and TSSOP package. FUNCTIONAL DIAGRAM RW0 RW1 RH0 A0 A1 WP HOLD RH1 RL0 RL1 NONVOLATILE DATA REGISTERS WIPER CONTROL REGISTERS CONTROL LOGIC SPI BUS INTERFACE RW2 RH2 RL2 RW3 RH3 RL3 SCK SI CS SO |
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