Microchip Technology MCP42010T-I/SL

Overview

MCP42010T-I/SL from Microchip Technology is a dual-channel, 256-tap, 10 kΩ digital potentiometer with SPI interface, designed for precision analog adjustment in embedded systems. It features ±1 LSB max INL/DNL, 1 µA static supply current, hardware shutdown (SHDN) and reset (RS) pins, and operates from 2.7V to 5.5V across –40°C to +85°C. Used in programmable gain control, sensor calibration, and DC bias trimming.

For engineers reviewing the MCP42010T-I/SL datasheet, MCP42010T-I/SL pinout, MCP42010T-I/SL application, or MCP42010T-I/SL equivalent, key selection criteria include dual-channel matching (<1% RAB variation), SPI daisy-chaining capability via SO pin, hardware-controlled shutdown, mid-scale power-up default (80h), and TSSOP-14 package compatibility with industrial PCB layouts.

Technical Context

The MCP42010T-I/SL implements two independent 8-bit wiper registers controlling linear 10 kΩ resistor arrays, each with terminals PA/PB/PW. Its SPI interface supports Mode 0,0 and 1,1 with Schmitt-triggered CS/SCK/SI inputs and push-pull SO output enabling multi-device daisy chains.

Hardware functions include dedicated SHDN pin that opens PA and shorts PW to PB for zero-power rheostat disable, and RS pin that forces both wipers to code 80h (mid-scale) on ≥150 ns low pulse - both pins feature active pull-ups and must not float. Channel-to-channel resistance matching is specified at ≤1% over temperature.

Key Specifications

Pinout & Package

Package: 14-pin Thin Shrink Small Outline Package (TSSOP), 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, exposed pad optional.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual digital potentiometer applications.

Compared with AD5232BRUZ10 and MCP42050T-I/SL, the MCP42010T-I/SL uniquely combines volatile 10 kΩ dual-channel operation with dedicated hardware SHDN/RS pins - making it optimal for industrial systems requiring deterministic power-up behavior and rapid hardware-initiated state changes without SPI overhead.

Availability

MCP42010T-I/SL is available at Aetrix Electronics and suitable for programmable gain control, sensor calibration, DC bias adjustment, and LED current regulation requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MCP42010T-I/SL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP42XXX family was engineered specifically for replacing mechanical potentiometers in digitally controlled analog signal paths - emphasizing precision, low power, industrial reliability, and seamless SPI integration in resource-constrained embedded systems.

FAQ

What is the nominal resistance value of the MCP42010T-I/SL?

The MCP42010T-I/SL has a nominal resistance of 10 kΩ per channel. This value applies to both potentiometer channels (P0 and P1) and is specified at +25°C with ±20% tolerance (8–12 kΩ). The 10 kΩ value is optimized for low-noise, moderate-power analog adjustment while maintaining compatibility with standard 3.3V/5V logic interfaces.

Does the MCP42010T-I/SL retain wiper position after power cycling?

No, the MCP42010T-I/SL is a volatile digital potentiometer: wiper positions reset to mid-scale (code 80h) on power-up. It does not include EEPROM or non-volatile memory. To maintain a specific setting across power cycles, the host MCU must reprogram the wiper registers after initialization - a behavior confirmed in the DS11195C datasheet Section 1.0 and Figure 2-25.

Can the MCP42010T-I/SL be used in rheostat mode?

Yes, the MCP42010T-I/SL supports rheostat mode by connecting either terminal A or B to the wiper (e.g., short PW0 to PB0). In this configuration, it functions as a two-terminal variable resistor with 256 discrete steps. The datasheet specifies rheostat DNL/INL (±1 LSB), wiper resistance (52 Ω typical at VDD = 5.5V), and tempco (800 ppm/°C) explicitly for this mode.

What is the purpose of the SHDN pin on the MCP42010T-I/SL?

The SHDN pin on the MCP42010T-I/SL provides hardware-controlled power-down: pulling it low opens both PA0 and PA1 terminals while shorting PW0 to PB0 and PW1 to PB1. This eliminates current flow through the resistor arrays, reducing supply current to ≤1 µA. Crucially, wiper register contents are preserved, allowing immediate resumption at the prior setting upon SHDN deassertion.

Is the MCP42010T-I/SL compatible with 3.3V microcontrollers?

Yes, the MCP42010T-I/SL operates from 2.7V to 5.5V and is fully compatible with 3.3V microcontrollers. Its SPI interface uses Schmitt-trigger inputs with VIH = 0.7×VDD and VIL = 0.3×VDD, ensuring reliable logic-level recognition at VDD = 3.3V (VIH ≥ 2.31V, VIL ≤ 0.99V). All timing parameters - including tSU = 40 ns and tHD = 10 ns - are guaranteed across the full voltage and temperature range.