NXP Semiconductors MMA2244KEG

Overview

MMA2244KEG from Freescale Semiconductor is a low-g, silicon capacitive, micromachined accelerometer with ±20g full-scale range, ratiometric linear output, and integrated 4th-order Bessel low-pass filter (360–440 Hz). It features factory-calibrated zero-g offset, self-test capability, and AEC-Q100 Grade 2 qualification (–40°C to +105°C), deployed in air bag crash sensing and hard drive protection systems.

For engineers reviewing the MMA2244KEG datasheet, MMA2244KEG pinout, MMA2244KEG application, or MMA2244KEG equivalent, key selection considerations include its SOIC-16 package, 5.0 V nominal supply operation, 20 mV/g sensitivity, status-fault latching behavior, and self-test response of 9.6–14.4 g at VDD = 5.0 V.

Technical Context

The MMA2244KEG integrates a surface-micromachined polysilicon g-cell with a CMOS ASIC using switched-capacitor signal conditioning, temperature compensation, and a fully integrated 4-pole Bessel filter. Its transducer is hermetically sealed at wafer level, enabling robust mechanical reliability under shock (1500 g powered, 2000 g unpowered).

It operates as a fully calibrated linear accelerometer within 4.75–5.25 V supply; outside this range, linearity is not guaranteed. The STATUS pin latches high on EPROM parity error, clock monitor failure (150–400 kHz detection window), or low-voltage detect (trip at 2.7–4.0 V), and resets only upon ST pulse if fault persists.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), surface-mount, Pb-free (KEG suffix), 7.5 mm × 10.3 mm body size with 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-g accelerometer applications.

Compared with ADXL202E and MMA8452Q, the MMA2244KEG uniquely delivers analog ratiometric output with hardware-latched STATUS for immediate fault visibility, making it optimal for safety-critical analog-signal-path designs where deterministic timing and minimal MCU overhead are essential.

Availability

MMA2244KEG is available at Aetrix Electronics and suitable for automotive crash sensing, industrial vibration monitoring, and consumer electronics motion protection requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.

Supply support for MMA2244KEG 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 embedded processing, sensors, and analog solutions for automotive, industrial, and consumer markets.

The MMA series was designed specifically for high-reliability motion sensing in safety-critical automotive systems and rugged industrial equipment, emphasizing hermetic sealing, factory calibration, and built-in diagnostics.

FAQ

What is the operating supply voltage range for the MMA2244KEG?

The MMA2244KEG operates within a supply voltage range of 4.75 V to 5.25 V for full calibration and guaranteed linearity. Operation outside this range may yield linear output but invalidates factory-trimmed sensitivity and zero-g offset specifications. The device includes a low-voltage detect circuit with trip points between 2.7 V and 4.0 V, signaled via the STATUS pin.

Does the MMA2244KEG require external components for basic operation?

Yes - the MMA2244KEG requires a 0.1 µF ceramic decoupling capacitor on VDD and an RC filter (1 kΩ + 0.01 µF) on VOUT to suppress switched-capacitor clock noise. These are mandatory per the datasheet layout guidelines. No external resistors or capacitors are needed for zero-g offset, sensitivity, or filter cutoff - all are factory-set and internal.

How does the self-test function work on the MMA2244KEG?

The MMA2244KEG self-test applies an electrostatic force to the g-cell's movable plate via a dedicated fourth electrode when ST is driven high. This produces a calibrated mechanical deflection equivalent to 9.6–14.4 g, resulting in a proportional VOUT shift. The same ST pulse also resets the latched STATUS output if no persistent fault exists.

What does the STATUS pin indicate on the MMA2244KEG?

The STATUS pin on the MMA2244KEG is an open-drain output that latches high upon occurrence of any of three fault conditions: EPROM parity error, clock monitor failure (detected if frequency falls outside 150–400 kHz), or low-voltage detection. It remains high until reset by a valid ST pulse - unless the underlying fault persists.

Is the MMA2244KEG pin-compatible with other devices in the MMA22xx family?

Yes - the MMA2244KEG shares identical SOIC-16 pinout, footprint, and electrical interface with MMA2244EG, MMA2244EGR2, and MMA2244KEGR2. All variants use Case 475-01 packaging and have identical pin functions, including N/C assignments and ST/VOUT/STATUS/VDD/VSS locations. Only suffix differences denote Pb-free (KEG) vs. standard (EG) and tape-and-reel (R2) packaging.