NXP Semiconductors MMA2240KEGR2

Overview

MMA2240KEGR2 from Freescale Semiconductor is a silicon capacitive, micromachined X-axis accelerometer with integrated signal conditioning, factory-trimmed 2-pole Bessel filter (300 Hz typ), ±7g measurement range, and ratiometric linear output. It delivers calibrated analog voltage output referenced to VDD, supports self-test verification, and operates across –40°C to +85°C in automotive and industrial vibration monitoring systems.

For engineers reviewing the MMA2240KEGR2 datasheet, MMA2240KEGR2 pinout, MMA2240KEGR2 application, or MMA2240KEGR2 equivalent, key selection criteria include its SOIC-16 package, 5.0 V nominal supply operation, 6 mA typical supply current, STATUS fault reporting, and self-test input (ST) for system-level integrity validation.

Technical Context

The MMA2240KEGR2 integrates a surface-micromachined polysilicon g-cell with a 1.2 µm CMOS ASIC containing capacitance-to-voltage conversion, two-stage switched-capacitor amplification, EPROM-trimmable offset/gain/temperature compensation, and a fully integrated 2-pole switched-capacitor Bessel filter. Its clock generator and oscillator bias are trimmed via on-chip EPROM to set filter cutoff and sensitivity.

Fault detection includes low-voltage detect (trip at 3.25 V typ), clock monitor (150–400 kHz valid range), and EPROM parity checking; all faults drive the open-drain STATUS pin high and latch until reset by a ≥100 µs ST pulse. The device is AEC-Q100 Grade 2 qualified and wafer-level hermetically sealed.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free termination, RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL202E and MMA8451Q, the MMA2240KEGR2 provides a purpose-built, analog-output, fault-aware single-axis solution optimized for deterministic real-time control loops and safety-critical self-test requirements - without software overhead or axis multiplexing trade-offs.

Availability

MMA2240KEGR2 is available at Aetrix Electronics and suitable for vibration monitoring systems, automotive diagnostic modules, and industrial shock recorders requiring stable component supply, long-term lifecycle continuity, and AEC-Q100-compliant performance.

Supply support for MMA2240KEGR2 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) was a leading designer of embedded processors, sensors, and analog ICs for automotive, industrial, and consumer applications.

The MMA2240KEGR2 belongs to Freescale's micromachined accelerometer product line, engineered for high-reliability motion sensing in safety-critical and condition-monitoring systems where analog simplicity, self-test assurance, and environmental robustness are essential.

FAQ

What is the operating temperature range for the MMA2240KEGR2?

The MMA2240KEGR2 is specified for continuous operation from –40°C to +85°C. This range aligns with industrial and under-hood automotive environments. Its AEC-Q100 Grade 2 qualification confirms suitability for automotive applications requiring reliable performance across this full span, including thermal cycling and long-term stability validation.

Does the MMA2240KEGR2 require external components for basic operation?

No, the MMA2240KEGR2 requires only a 0.1 µF decoupling capacitor on VDD and optionally a 1 kΩ + 0.01 µF RC filter on VOUT to suppress switched-capacitor clock noise. All signal conditioning, filtering, trimming, and fault monitoring are fully integrated - no external resistors, capacitors, or trim pots are needed for calibrated operation.

How does the self-test function verify system integrity in the MMA2240KEGR2?

The MMA2240KEGR2 applies a calibrated electrostatic force to the movable g-cell plate via the ST pin, causing mechanical deflection equivalent to known acceleration. The resulting output shift (≥0.60 V) confirms both mechanical functionality and full analog signal chain integrity - from transducer to output amplifier - enabling pre-deployment verification and periodic in-system diagnostics.

What does "ratiometric output" mean for the MMA2240KEGR2, and why is it beneficial?

Ratiometric output means the MMA2240KEGR2's zero-g offset and sensitivity scale linearly with VDD supply voltage. For example, at 5.0 V supply, sensitivity is 60.0 mV/g/V; at 4.9 V, it scales proportionally. This cancels supply-induced errors when digitized by an ADC sharing the same VDD reference - eliminating need for precision external voltage references in cost-sensitive embedded systems.

Can the STATUS pin of the MMA2240KEGR2 be used for real-time fault monitoring?

Yes - the STATUS pin is an open-drain output that goes high and latches upon detection of low supply voltage (<3.25 V), clock oscillator failure (<150 kHz), or EPROM parity error. It remains asserted until reset by a ≥100 µs pulse on ST, enabling microcontrollers to log faults, trigger alerts, or initiate safe shutdown - making MMA2240KEGR2 suitable for ISO 26262-aligned diagnostic architectures.