CAT5259-D - CAT5259 Quad Digitally Programmable...

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CAT5259 © 2009 SCILLC. All rights reserved. 1 Doc. No. MD-2000 Rev. J Characteristics subject to change without notice NONVOLATILE DATA REGISTERS CONTROL LOGIC WIPER CONTROL ± REGISTERS I²C BUS INTERFACE R W0 R W1 R W2 R W3 R L0 A 0 A 1 SCL SDA A 2 A 3 R L1 R L2 R L3 R H0 R H1 R H2 R H3 WP Quad Digitally Programmable Potentiometers (DPP™) with 256 Taps and I²C Interface FEATURES ± Four linear taper digitally programmable potentiometers ± 256 resistor taps per potentiometer ± End to end resistance 50 k or 100 k ± Potentiometer control and memory access via I²C 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 1 μA ± 1,000,000 nonvolatile WRITE cycles ± 100 year nonvolatile memory data retention ± 24-lead SOIC and 24-lead TSSOP packages ± Industrial temperature range For Ordering Information details, see page 15. PIN CONFIGURATION SOIC (W) TSSOP (Y) NC 1 24 A3 A0 2 23 SCL R W3 3 22 R L2 R H3 4 21 R H2 R L3 5 20 R W2 NC 6 19 NC V CC 7 18 GND R LO 8 17 R W1 R HO 9 16 R H1 R WO 10 15 R L1 A2 11 14 A1 12 13 SDA DESCRIPTION The CAT5259 is four digitally programmable poten– tiometers (DPPs™) integrated with control logic and 16 bytes of NVRAM memory. Each DPP 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 DPP. 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 I²C 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 registers. The CAT5259 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 0ºC to 70ºC commercial and -40ºC to 85ºC industrial operating temperature ranges and offered in a 24-lead SOIC and TSSOP package. FUNCTIONAL DIAGRAM
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CAT5259 Doc. No. MD-2000 Rev. J 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice PIN DESCRIPTIONS SCL: Serial Clock The CAT5259 serial clock input pin is used to clock all data transfers into or out of the device. SDA: Serial Data The CAT5259 bidirectional serial data pin is used to transfer data into and out of the device.
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This note was uploaded on 06/17/2010 for the course ECE 500 taught by Professor Ma during the Spring '10 term at Abraham Baldwin Agricultural College.

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CAT5259-D - CAT5259 Quad Digitally Programmable...

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