Microchip Technology MCP33131-05-E/MS

Overview

MCP33131-05-E/MS from Microchip Technology is a 16-bit, single-ended input, successive approximation register (SAR) analog-to-digital converter with 500 kSPS throughput, 86.7 dBFS SNR at 10 kHz, ±2.2 LSB INL, and AEC-Q100 Grade 1 qualification for automotive battery management and motor control systems.

For engineers reviewing the MCP33131-05-E/MS datasheet, MCP33131-05-E/MS pinout, MCP33131-05-E/MS application, or MCP33131-05-E/MS equivalent, key selection criteria include its 1.8V AVDD supply, 500 kSPS sample rate with no latency output, SPI-compatible 3-wire interface up to 100 MHz SCLK, and ultra-low 0.8 µA standby current - critical for high-precision, low-power embedded data acquisition.

Technical Context

The MCP33131-05-E/MS implements a SAR architecture with internal clock generation independent of SPI timing, enabling deterministic conversion cycles of 2 µs (tACQ + tCNV). It supports pseudo-differential input operation in single-ended configuration with full-scale range 0V to VREF (2.5V–5.1V), and performs automatic self-calibration at power-up plus on-demand recalibration via SPI command.

Its dual-supply design separates analog (AVDD = 1.8V) and digital I/O (DVIO = 1.7V–5.5V) domains, eliminating level shifters when interfacing with PIC32 or other host MCUs. The device maintains stable performance across –40°C to +125°C and features 84 dB CMRR and 60 dB PSRR for robust noise immunity in electric vehicle and industrial environments.

Key Specifications

Pinout & Package

Package: MSOP-10 (Pb-free, 3 mm × 4.9 mm, 0.5 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC applications.

Compared with ADS8860IDRCT, the MCP33131-05-E/MS provides integrated recalibration and AEC-Q100 qualification at lower cost, while MCP33131-10-E/MS offers identical functionality with 2× throughput - making the -05 variant optimal for thermal-stability-critical, power-constrained BMS designs.

Availability

MCP33131-05-E/MS is available at Aetrix Electronics and suitable for electric vehicle battery management systems, industrial motor control drives, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP33131-05-E/MS 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The MCP331xx family targets high-precision, low-power data acquisition in harsh environments - designed specifically for automotive-grade battery monitoring, motor control feedback, and portable test instrumentation where accuracy, stability, and qualification matter.

FAQ

What is the maximum SPI clock frequency supported by the MCP33131-05-E/MS?

The MCP33131-05-E/MS supports an SPI clock (SCLK) frequency up to 100 MHz, with timing specifications validated for DVIO ≥ 3.3V (10 ns period), DVIO ≥ 2.3V (12 ns), and DVIO ≥ 1.7V (16 ns). This enables high-speed data transfer while maintaining compatibility with common MCU SPI peripherals.

Does the MCP33131-05-E/MS require an external reference voltage?

Yes, the MCP33131-05-E/MS requires an external reference voltage (VREF) in the range of 2.5V to 5.1V to define its full-scale input range. It does not include an internal reference; VREF must be supplied externally with low noise and adequate decoupling (10 µF tantalum recommended).

How does the self-calibration function work in the MCP33131-05-E/MS?

The MCP33131-05-E/MS performs automatic self-calibration at power-up to correct offset, gain, and linearity errors. Users can also trigger on-demand recalibration via a dedicated SPI command requiring 1024 SCLK cycles - essential after VREF changes or thermal drift to maintain ±2.2 LSB INL accuracy.

What is the purpose of the CNVST pin on the MCP33131-05-E/MS?

The CNVST pin on the MCP33131-05-E/MS serves as the convert-start signal: a rising edge initiates input sampling, and a falling edge releases the 16-bit conversion result onto the SDO line. It functions as both timing control and chip select in the 3-wire SPI interface.

Is the MCP33131-05-E/MS pin-compatible with other devices in the MCP331xx family?

Yes, the MCP33131-05-E/MS shares identical pinout and package (MSOP-10) with all MCP331xx-XX variants including MCP33131-10-E/MS, MCP33121-05-E/MS, and MCP33111-05-E/MS - enabling drop-in resolution or speed upgrades without PCB redesign.