M MCP41XXX/42XXX Single/Dual Digital Potentiometer with SPIв„ў Interface
Features Description 256 taps for each potentiometer Potentiometer values for 10 kΩ, 50 kΩ and
100 kΩ Single and dual versions SPI™ serial interface (mode 0,0 and 1,1) ±1 LSB max INL & DNL Low power CMOS technology 1 µA maximum supply current in static operation Multiple devices can be daisy-chained together
(MCP42XXX only) Shutdown feature open circuits of all resistors for
maximum power savings Hardware shutdown pin available on MCP42XXX
only Single supply operation (2.7V -5.5V) Industrial temperature range: -40°C to +85°C Extended temperature range: -40°C to +125°C The MCP41XXX and MCP42XXX devices are 256position, digital potentiometers available in 10 kΩ,
50 kΩ and 100 kΩ resistance versions. The
MCP41XXX is a single-channel device and is offered in
an 8-pin PDIP or SOIC package. The MCP42XXX contains 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 consume <1 µA during static operation. A software shutdown feature is provided that disconnects the “A”
terminal from the resistor stack and simultaneously connects the wiper to the “B” terminal. In addition, the dual
MCP42XXX has a SHDN pin that performs the same
function in hardware. During shutdown mode, the contents 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. Channel-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 …