Microchip Technology MCP33111D-05T-E/MN

Overview

MCP33111D-05T-E/MN from Microchip Technology is a 12-bit, 500 kSPS fully differential successive approximation register (SAR) analog-to-digital converter with no missing codes, ultra-low standby current (~0.8 µA), and AEC-Q100 Grade 1 qualification (-40°C to +125°C). 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) for ±VREF differential input range - ideal for high-precision battery-powered motor control and EV battery management systems.

For engineers reviewing the MCP33111D-05T-E/MN datasheet, MCP33111D-05T-E/MN pinout, MCP33111D-05T-E/MN application, or MCP33111D-05T-E/MN equivalent, key selection criteria include its 12-bit no-missing-codes performance, 500 kSPS throughput with zero-latency output, SPI-compatible 3-wire interface up to 100 MHz, self-calibration capability, and TDFN-10 package compatibility with space-constrained automotive and industrial sensing designs.

Technical Context

The MCP33111D-05T-E/MN implements a fully differential SAR architecture with internal clock generation independent of SCLK, enabling deterministic conversion timing. Its acquisition phase connects sampling capacitors directly to AIN+ and AIN− during Standby mode, minimizing power consumption while maintaining input tracking.

It features on-demand and automatic power-up self-calibration for offset, gain, and linearity errors, supporting stable performance across temperature and reference voltage variations. The device uses CNVST as both conversion start trigger and chip select, with data output on SDO synchronized to SCLK during Standby - eliminating latency between conversion completion and data availability.

Key Specifications

Pinout & Package

Package: 3 mm × 3 mm TDFN-10 (exposed pad), Pb-free, RoHS-compliant, thermal resistance θ_JA = 68°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953IRHBT and AD7476ARTZ-REEL7, the MCP33111D-05T-E/MN delivers best-in-class differential linearity (±0.12 LSB INL), integrated self-calibration, and AEC-Q100 qualification - making it the optimal choice for automotive and industrial applications demanding accuracy, reliability, and minimal system-level compensation.

Availability

MCP33111D-05T-E/MN is available at Aetrix Electronics and suitable for battery-powered equipment, motor control applications, and electric vehicle battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP33111D-05T-E/MN 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 semiconductor products.

The MCP331xxD family is designed for high-precision, low-power, automotive-grade data acquisition - emphasizing differential input fidelity, on-chip calibration, and robust operation in harsh electrical and thermal environments.

FAQ

What is the maximum SPI clock frequency supported by the MCP33111D-05T-E/MN?

The MCP33111D-05T-E/MN supports an SPI clock (SCLK) frequency up to 100 MHz, with timing specifications defined for DVIO ≥ 3.3V (10 ns period), DVIO ≥ 2.3V (12 ns), and DVIO ≥ 1.7V (16 ns). This allows high-speed data readout without bottlenecking the host processor, especially important in real-time motor control where latency must be minimized. The internal ADC clock is independent of SCLK, ensuring consistent 500 kSPS throughput regardless of interface speed.

Does the MCP33111D-05T-E/MN require an external reference voltage?

Yes, the MCP33111D-05T-E/MN requires an external reference voltage (VREF) in the range of 2.5V to 5.1V applied to the VREF pin. This sets the full-scale differential input range to ±VREF. The device does not include an internal reference; using a precision external reference (e.g., REF5025 or MAX6126) is essential to achieve specified INL, SNR, and THD performance. Decoupling with a 10 µF tantalum capacitor is mandatory per the datasheet.

How does the self-calibration function work on the MCP33111D-05T-E/MN?

The MCP33111D-05T-E/MN performs automatic self-calibration at power-up to correct offset, gain, and linearity errors. A recalibration command can also be issued via the SDI pin during normal operation - requiring 1024 SCLK cycles to complete (~500–650 ms). This feature maintains accuracy over temperature drift and reference voltage changes, eliminating the need for external calibration circuitry or firmware compensation routines in automotive and industrial deployments.

What is the purpose of the CNVST pin on the MCP33111D-05T-E/MN?

The CNVST pin on the MCP33111D-05T-E/MN serves dual functions: a rising edge initiates analog input sampling and starts conversion, while a falling edge places the SDO pin in high-impedance state during acquisition and enables output of the completed 12-bit result. It acts as both conversion trigger and chip select - simplifying interface logic and ensuring deterministic timing between sample initiation and data availability, which is critical for synchronous control systems.

Is the MCP33111D-05T-E/MN pin-compatible with other members of the MCP331xxD family?

Yes, the MCP33111D-05T-E/MN shares identical pinout and package (TDFN-10) with all MCP33131D/MCP33121D/MCP33111D-XX variants, including -10 and -05 versions across 16/14/12-bit resolutions. This allows drop-in replacement within the same resolution grade (e.g., MCP33111D-10 → MCP33111D-05) without PCB redesign, provided system-level timing and power constraints accommodate the lower sample rate and reduced current draw of the -05 variant.