CAT525 Datasheet | Catalyst Semiconductor

Configured Digitally Programmable Potentiometer (DPP™): Programmable Voltage Applications Features s Four 8-bit DPPs configured as programmable APPLICATIONS s Automated product calibration s Remote control adjustment of equipment s Offset, gain and zero adjustments in voltage sources in DAC-like applications s Independent reference inputs s Buffered wiper outputs s Non-volatile NVRAM memory wiper storage s Output voltage range includes both supply rails s 4 independently addressable buffered self-calibrating and adaptive control systems s Tamper-proof calibrations s DAC (with memory) substitute output wipers s 1 LSB accuracy, high resolution s Serial µP interface s Single supply operation: 2.7V-5.5V s Setting read-back without effecting outputs DESCRIPTION The CAT525 is a quad 8-Bit digitally programmable potentiometer (DPP™) configured for programmable voltage and DAC-like applications. Intended for final calibration of products such as camcorders, fax machines and cellular telephones on automated high volume production lines and systems capable of self calibration, it is also well suited for applications were equipment requiring periodic adjustment is either difficult to access or located in a hazardous environment. The CAT525 offers four independently programmable DPPs each having its own reference inputs and each capable of rail to rail output swing. The wipers are buffered by rail to rail op amps. Wiper settings, stored in non-volatile NVRAM memory, are not lost when the device is powered down and are automatically rein FUNCTIONAL DIAGRAM V H1 REF V H3 REF V H4 REF 19 V H2 REF 2 1 20 stated when power is returned. Each wiper can be dithered to test new output values without effecting the stored settings and stored settings can be read back without disturbing the DPP’s output. Control of the CAT525 is acplished with a simple 3 wire serial interface. A Chip Select pin allows several CAT525's to share a mon serial interface and munications...