Microchip Technology MCP33111-10-E/MS

Overview

MCP33111-10-E/MS from Microchip Technology is a 12-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with single-ended input, no missing codes, and no output latency. It operates from a 1.8V analog supply (AVDD), supports 1.7V–5.5V digital I/O (DVIO), and accepts 2.5V–5.1V external reference (VREF). It delivers 73.8 dBFS SNR and ±0.12 LSB INL at 10 kHz input, targeting high-precision battery-powered data acquisition.

For engineers reviewing the MCP33111-10-E/MS datasheet, MCP33111-10-E/MS pinout, MCP33111-10-E/MS application, or MCP33111-10-E/MS equivalent, this page provides verified electrical specs, SPI timing constraints, AEC-Q100 Grade 1 automotive qualification, MSOP-10 package mapping, and real-world use cases in EV battery monitoring and motor control systems.

Technical Context

The MCP33111-10-E/MS implements a true SAR architecture with internal clock generation-conversion timing is independent of SCLK. It uses a 12-bit unipolar transfer function (0V to +VREF), supports pseudo-differential operation via single-ended configuration, and performs automatic self-calibration on power-up plus user-triggered recalibration for offset, gain, and linearity errors.

Its CNVST pin serves as both conversion start and chip select; SDO presents data in high-impedance state until CNVST falls, enabling seamless 3-wire SPI interfacing. Input acquisition time is 250–300 ns across temperature, and total conversion cycle (tACQ + tCNV) is 1 µs at 1 Msps throughput.

Key Specifications

Pinout & Package

Package: MSOP-10 (3.0 mm × 4.9 mm, 0.5 mm pitch), Pb-free, RoHS-compliant, thermal resistance θJA = 202°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7042IRUGR and AD7476AARMZ, the MCP33111-10-E/MS uniquely combines AEC-Q100 Grade 1 qualification, programmable 2.5–5.1V reference support, on-demand self-calibration, and 0.8 µA standby current - making it the only option qualified for automotive battery management and certified for extended temperature operation without performance degradation.

Availability

MCP33111-10-E/MS is available at Aetrix Electronics and suitable for electric vehicle battery management systems, industrial motor control feedback loops, and portable medical instrumentation requiring stable component supply across automotive and industrial lifecycles.

Supply support for MCP33111-10-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.

The MCP331xx family was designed specifically for high-accuracy, low-power, automotive-grade data acquisition-emphasizing robustness in harsh environments, minimal external components, and seamless integration with PIC and dsPIC microcontrollers.

FAQ

What is the maximum SPI clock frequency supported by the MCP33111-10-E/MS?

The MCP33111-10-E/MS supports an SCLK frequency up to 100 MHz under DVIO ≥3.3V conditions. At lower DVIO voltages (e.g., 1.7V), the maximum SCLK drops to 62.5 MHz. Timing parameters such as tSCLK_L and tSCLK_H scale accordingly, and all values are specified in Table 1-2 of the DS20006122A datasheet. The MCP33111-10-E/MS does not require SCLK for conversion timing-the internal SAR clock handles sampling independently.

Does the MCP33111-10-E/MS require external calibration components?

No, the MCP33111-10-E/MS performs full self-calibration-including offset, gain, and linearity correction-on power-up and upon command via the recalibrate instruction. This eliminates the need for external trim pots, calibration DACs, or factory calibration routines. The MCP33111-10-E/MS achieves ±0.12 LSB INL and ±0.06 LSB DNL without any external components, relying solely on its internal reference and trimming circuitry.

Can the MCP33111-10-E/MS operate with a 2.5V reference voltage?

Yes, the MCP33111-10-E/MS supports VREF from 2.5V to 5.1V. At VREF = 2.5V, the input full-scale range is 0V to 2.5V, and dynamic performance remains robust: SNR = 73.2 dBFS and SFDR = 94.2 dBc at 10 kHz. The device's gain error drift is only ±0.35 µV/°C, ensuring stable scaling across temperature-critical for precision measurement systems using low-voltage references.

Is the MCP33111-10-E/MS pin-compatible with other members of the MCP331xx family?

Yes, all MCP331xx-10 variants-including MCP33131-10, MCP33121-10, and MCP33111-10-share identical pinouts and package footprints (MSOP-10 and TDFN-10). They differ only in resolution (16/14/12-bit) and corresponding performance specs (e.g., INL, SNR). This allows drop-in upgrades or downgrades on the same PCB layout, provided firmware and reference design accommodate the resolution change.

What decoupling capacitors are required for stable operation of the MCP33111-10-E/MS?

Per Microchip's DS20006122A recommendations: a 1 µF ceramic capacitor on AVDD, a 0.1 µF ceramic capacitor on DVIO, and a 10 µF tantalum capacitor on VREF. These values minimize supply noise and ensure stable reference settling-especially critical before CNVST assertion. Failure to implement proper decoupling may degrade SNR and cause INL drift, particularly at high sample rates or elevated temperatures. The MCP33111-10-E/MS datasheet specifies these as mandatory for guaranteed performance.