NXP Semiconductors MMA1211KEGR2

Overview

MMA1211KEGR2 from NXP Semiconductors (formerly Freescale) is a surface-mount, single-axis (Z-axis), silicon capacitive micromachined accelerometer with integrated signal conditioning, 4th-order Bessel low-pass filter, and factory-calibrated self-test. It delivers ±150g measurement range, 360–440 Hz bandwidth, and ratiometric linear output referenced to VDD. Used in automotive crash sensing and industrial impact monitoring where AEC-Q100 Grade 2 reliability is required.

For engineers reviewing the MMA1211KEGR2 datasheet, MMA1211KEGR2 pinout, MMA1211KEGR2 application, or MMA1211KEGR2 equivalent, key selection criteria include its SOIC-16 package, self-test fault-latching STATUS pin, LVD trip at 2.7–4.0 V, and calibrated sensitivity of 12.66–14.00 mV/g/V across temperature.

Technical Context

The MMA1211KEGR2 implements a micromachined polysilicon g-cell transducer hermetically sealed at wafer level, paired with a CMOS ASIC that performs switched-capacitor capacitance-to-voltage conversion, temperature compensation, and 4-pole Bessel filtering. Its ratiometric architecture ensures offset and sensitivity scale linearly with VDD (4.75–5.25 V), enabling supply-noise rejection when interfaced with microcontroller ADCs.

Self-test activation applies electrostatic force to the movable plate via dedicated ST pin, producing a calibrated 55–75 g output shift verified by STATUS pin latching. Fault detection includes low-voltage detect (trip at 2.7–4.0 V), clock monitor (50–260 kHz), and EPROM parity check - all reported on the open-drain STATUS output.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free, tape-and-reel format. Body dimensions: 9.65 mm × 5.97 mm × 1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL103CRZ and MMA8451QR1, the MMA1211KEGR2 uniquely combines analog ratiometric output, integrated self-test with fault latching, and AEC-Q100 Grade 2 qualification in SOIC-16 - making it optimal for cost-sensitive, safety-aware analog-signal-chain designs where deterministic verification and supply-noise immunity are mandatory.

Availability

MMA1211KEGR2 is available at Aetrix Electronics and suitable for automotive crash sensing, industrial impact logging, and transportation shock recording requiring stable component supply and long-term lifecycle support.

Supply support for MMA1211KEGR2 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MMA series was designed by Freescale (acquired by NXP in 2015) specifically for high-reliability, single-axis analog acceleration sensing in safety-critical automotive and industrial systems - emphasizing factory calibration, self-test, and AEC-Q100 compliance.

FAQ

What is the function of the STATUS pin on the MMA1211KEGR2?

The STATUS pin on the MMA1211KEGR2 is an open-drain output that latches high upon detection of low-voltage condition (VDD < 2.7 V), clock oscillator failure (<50 kHz), or EPROM parity error. It remains asserted until reset by a ≥100 μs high pulse on the ST pin - unless the fault persists. This enables system-level fault visibility without continuous polling, and is integral to the MMA1211KEGR2's safety-oriented design.

Does the MMA1211KEGR2 require external components for basic operation?

No, the MMA1211KEGR2 requires only a 0.1 μF decoupling capacitor on VDD for stable operation. Its 4-pole Bessel filter, temperature compensation, zero-g offset, and sensitivity are factory-set and do not need external resistors or capacitors. An optional 1 kΩ + 0.01 μF RC filter on VOUT suppresses clock noise, but is not mandatory for functionality - making the MMA1211KEGR2 a truly integrated analog acceleration solution.

How does the self-test feature of the MMA1211KEGR2 verify system integrity?

The MMA1211KEGR2 self-test applies electrostatic force to the micromachined g-cell's movable plate via the ST pin, generating a calibrated 55–75 g output shift at VOUT. Simultaneously, the STATUS pin reflects self-test activation and latches if internal faults (LVD, clock, EPROM) occur. This dual-path verification confirms both mechanical transducer functionality and ASIC signal path integrity - a requirement validated in automotive airbag systems where the MMA1211KEGR2 is deployed.

What does the "K" suffix in MMA1211KEGR2 signify?

The "K" suffix in MMA1211KEGR2 indicates the device is manufactured using an alternate silicon sourcing process while maintaining identical electrical specifications, package, pinout, and qualification status as the base MMA1211EG part. It is RoHS-compliant and Pb-free, with no functional or performance deviation from non-K variants - ensuring seamless BOM substitution without design revalidation.

Can the MMA1211KEGR2 be used outside its specified 4.75–5.25 V supply range?

The MMA1211KEGR2 may operate outside 4.75–5.25 V, but only within absolute maximum ratings (–0.3 to +7.0 V). However, calibration is guaranteed only within the 4.75–5.25 V window. Below 4.75 V, sensitivity and offset drift increase nonlinearly; above 5.25 V, clock stability and self-test accuracy degrade. For reliable measurement, the MMA1211KEGR2 must be powered within its specified operating supply range.