? Single/Dual Digital Potentiometer With SPI Interface

MCP42010 The MCP41XXX and MCP42XXX devices are 256- position, Digital Potentiometers available in 10 k , , 50 k and 100 k resistance versions. The , , MCP41XXX is a single-channel device and is offered in an 8-pin PDIP or SOIC package. The MCP42XXX con- tains two independent channels in a 14-pin PDIP, SOIC or TSSOP package. The wiper position of the MCP41XXX/42XXX varies linearly and is controlled via an industry-standard SPI Interface The devices con- sume <1 A during static operation. A software shut down feature is provided that disconnects the A terminal from the resistor stack and simultaneously con- nects the wiper to the B rminal. In addition, the dual MCP42XXX has a SHDN pin that performs the same function in hardware. During shutdown mode, the con- tents of the wiper Register CAN be changed and the potentiometer returns from shutdown to the new value. The wiper is reset to the mid-scale position (80h) upon power-up. The RS (reset) pin implements a hardware reset and also returns the wiper to mid-scale. The MCP42XXX SPI Interface includes both the SI and SO pins, allowing daisy-chaining of multiple devices. Chan- nel-to-channel resistance matching on the MCP42XXX varies by less than 1%. These devices operate from a single 2.7 - 5.5V supply and are specified over the extended and industrial temperature ranges. By Microchip Technology Inc.