Microchip Technology MCP33111-05T-E/MS

Overview

MCP33111-05T-E/MS from Microchip Technology is a 12-bit, 500 kSPS successive approximation register (SAR) analog-to-digital converter with single-ended input, no missing codes, and no latency output. 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). Designed for high-precision, low-power data acquisition in automotive battery management and motor control systems.

For engineers reviewing the MCP33111-05T-E/MS datasheet, MCP33111-05T-E/MS pinout, MCP33111-05T-E/MS application, or MCP33111-05T-E/MS equivalent, this device delivers verified 12-bit resolution, ±0.12 LSB INL, 73.8 dBFS SNR at 10 kHz, AEC-Q100 Grade 1 qualification (–40°C to +125°C), and SPI-compatible 3-wire interface up to 100 MHz SCLK - critical for timing-critical embedded sensing and closed-loop control.

Technical Context

The MCP33111-05T-E/MS implements a SAR architecture with internal clock generation independent of SCLK, enabling deterministic conversion timing. Its pseudo-differential input stage supports true single-ended operation with full-scale range of 0V to VREF, and self-calibration corrects offset, gain, and linearity errors at power-up or on-demand.

It enters ultra-low-power Standby mode (<0.8 µA typical) between conversions, sampling only on CNVST rising edge, and presents output data on SDO after conversion completion. The 10-pin MSOP package integrates dedicated analog (AIN+, AIN−, AVDD, VREF, GND) and digital (SDI, SDO, SCLK, CNVST, DVIO) terminals with strict separation to minimize noise coupling.

Key Specifications

Pinout & Package

Package: 10-pin MSOP (3.0 mm × 4.9 mm, 0.5 mm pitch), Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7042IRUGR and AD7476ARTZ-REEL7, the MCP33111-05T-E/MS uniquely combines AEC-Q100 Grade 1 qualification, on-demand self-calibration, and 2.5–5.1V VREF programmability - making it the only option among the three qualified for automotive battery monitoring and thermally variable industrial control.

Availability

MCP33111-05T-E/MS is available at Aetrix Electronics and suitable for electric vehicle battery management systems, motor control feedback loops, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MCP33111-05T-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 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 was designed specifically for high-precision, low-power, automotive-qualified data acquisition in space- and energy-constrained embedded systems - emphasizing robustness, ease of integration, and deterministic timing behavior.

FAQ

What is the maximum SPI clock frequency supported by the MCP33111-05T-E/MS?

The MCP33111-05T-E/MS supports an SCLK frequency up to 100 MHz, with timing specifications validated for DVIO ≥ 3.3V (tSCLK = 10 ns min). At lower DVIO voltages (e.g., 1.7V), the maximum SCLK drops to 62.5 MHz (tSCLK = 16 ns). This high-speed interface enables rapid data readout without bottlenecking the 500 kSPS conversion rate of the MCP33111-05T-E/MS.

Does the MCP33111-05T-E/MS require an external reference voltage?

Yes, the MCP33111-05T-E/MS requires an external reference voltage applied to the VREF pin, which must be between 2.5V and 5.1V. The device does not include an internal reference; VREF directly defines the full-scale input range (0V to VREF) and impacts SNR and linearity performance. A 10 µF tantalum decoupling capacitor is recommended at the VREF pin per the MCP33111-05T-E/MS datasheet.

How does the self-calibration function work in the MCP33111-05T-E/MS?

The MCP33111-05T-E/MS performs automatic self-calibration at power-up to correct offset, gain, and linearity errors. Users can also trigger recalibration on-demand via a command sent through the SDI pin, requiring 1024 SCLK cycles. This feature restores accuracy after environmental changes - such as VREF settling drift - and is especially valuable in automotive and industrial applications where long-term stability is critical for the MCP33111-05T-E/MS.

What is the input acquisition time (tACQ) for the MCP33111-05T-E/MS?

The input acquisition time (tACQ) for the MCP33111-05T-E/MS is 700 ns (typical) to 800 ns (max) across the full temperature range (–40°C to +125°C). This parameter defines the minimum time the analog input must be stable before the CNVST rising edge to ensure accurate sampling. It is shorter than the total conversion cycle time (tCYC = 2 µs), allowing efficient interleaved sampling in multi-channel systems using the MCP33111-05T-E/MS.

Is the MCP33111-05T-E/MS pin-compatible with other devices in the MCP331xx family?

Yes, the MCP33111-05T-E/MS shares identical pinout and package (MSOP-10) with all members of the MCP33131/21/11-XX family, including MCP33131-05T-E/MS and MCP33121-05T-E/MS. This allows hardware reuse across 12-, 14-, and 16-bit variants - designers can scale resolution without PCB layout changes, provided DVIO, AVDD, and VREF constraints are met for the target variant of the MCP33111-05T-E/MS.