NXP Semiconductors MMA6222AKEGR2

Overview

MMA6222AKEGR2 from Freescale Semiconductor is a dual-axis (X/Y) silicon capacitive micromachined accelerometer with full digital signal processing, ratiometric analog voltage outputs, and AEC-Q100 Grade 2 qualification (−40°C to +105°C). It delivers ±20g full-scale range per axis, 400 Hz 4-pole low-pass filtering, and operates from 3.3 V or 5 V supply - designed for crash detection and airbag deployment systems.

For engineers reviewing the MMA6222AKEGR2 datasheet, MMA6222AKEGR2 pinout, MMA6222AKEGR2 application, or MMA6222AKEGR2 equivalent, key selection criteria include its analog output architecture, over-damped transducer response, integrated self-test, CAP/HOLD synchronization capability, and automotive-grade reliability under shock and temperature stress.

Technical Context

The MMA6222AKEGR2 integrates dual g-cells with independent trimming, a 4-pole SINC-based DSP low-pass filter (typ. 400 Hz), and two dedicated DACs driving XOUT/YOUT ratiometrically to VCC. Its internal oscillator runs at 4.0 MHz ±5%, feeding a clock monitor and enabling deterministic timing for safety-critical sampling.

It features separate analog (VSSA) and digital (VSS) ground pins, redundant CREG/CREGA/CREF power rail filtering, and fault reporting via STATUS pin - including parity errors, over-temperature, and clock faults - with latch-clearing via ST pin transition.

Key Specifications

Pinout & Package

Pb-free 20-pin SOIC package (Case 475A-02), 7.5 mm × 12.8 mm body, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-axis analog accelerometer applications.

Compared with ADXL202AE and MMA8452Q, the MMA6222AKEGR2 uniquely provides ratiometric analog outputs with integrated fault reporting (STATUS), over-damped mechanical response, and AEC-Q100-compliant analog signal chain - making it purpose-built for legacy and new airbag control units requiring deterministic analog interface and safety validation.

Availability

MMA6222AKEGR2 is available at Aetrix Electronics and suitable for automotive safety systems, industrial impact monitors, and transportation shock loggers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for MMA6222AKEGR2 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in automotive, industrial, and networking solutions.

The MMA62XXAKEG series was developed specifically for automotive occupant restraint systems, emphasizing analog output fidelity, fault resilience, and AEC-Q100 Grade 2 reliability in harsh environments.

FAQ

What is the primary function of the STATUS pin on the MMA6222AKEGR2?

The STATUS pin on the MMA6222AKEGR2 is an open-drain fault indicator that asserts logic high when internal faults occur - including parity errors, over-temperature conditions, internal clock frequency faults, or device reset. It remains high until cleared by a low-to-high transition on the ST pin. This behavior enables the host system to detect and respond to sensor anomalies in real time, a critical requirement for airbag control units using the MMA6222AKEGR2.

Does the MMA6222AKEGR2 support both 3.3 V and 5 V supply voltages simultaneously?

No, the MMA6222AKEGR2 operates from a single supply voltage - either 3.3 V (±0.15 V) or 5 V (±0.25 V), but not both concurrently. The device's analog outputs (XOUT/YOUT) are ratiometric to VCC, so output scaling and noise performance depend on the selected supply. Designers must choose one operating voltage and ensure all supporting components (e.g., CREG, CREF capacitors) meet the corresponding voltage ratings specified in the MMA6222AKEGR2 datasheet.

How does the CAP/HOLD pin affect data acquisition timing in the MMA6222AKEGR2?

The CAP/HOLD pin on the MMA6222AKEGR2 controls synchronization of analog output updates: when held low, XOUT and YOUT continuously reflect the latest processed acceleration sample; on a low-to-high transition, the outputs freeze at their current values until CAP/HOLD returns low. This allows precise system-wide capture of acceleration data across multiple sensors or coordinated with other subsystems - essential for deterministic timing in crash detection algorithms using the MMA6222AKEGR2.

Is the MMA6222AKEGR2 pin-compatible with other devices in the MMA62XXAKEG family?

Yes, all devices in the MMA62XXAKEG family - including MMA6222AKEGR2, MMA6255AKEGR2, and MMA621010AKEGR2 - share identical 20-pin SOIC (475A-02) packaging and pinout. The only differences are full-scale range (±20g, ±50g, ±100g) and internal DSP filter coefficients. This allows hardware reuse across platforms, with software or calibration adjustments accommodating the different sensitivity values of the MMA6222AKEGR2 versus higher-range variants.

What is the role of the CREG, CREGA, and CREF pins on the MMA6222AKEGR2?

CREG supplies the internal digital regulator rail; CREGA supplies the analog regulator rail; CREF connects to the internal reference voltage node used by the DACs and analog front-end. Each requires dedicated low-ESR external capacitors to VSSA (for CREGA/CREF) or VSS (for CREG) to stabilize internal power domains and minimize noise coupling - a mandatory design requirement for achieving the specified accuracy and noise performance of the MMA6222AKEGR2.