NXP Semiconductors MMA2301KEGR2

Overview

MMA2301KEGR2 from NXP Semiconductors (formerly Freescale) is a surface-mount, single-axis ±200g micromachined capacitive accelerometer with integrated signal conditioning, 4th-order Bessel low-pass filter, and factory-calibrated self-test. It delivers ratiometric linear output (10.0 mV/g/V), operates from 4.75–5.25 V, draws 3.0–6.0 mA, and is qualified to AEC-Q100 Grade 2 (−40°C to +105°C) for automotive crash sensing.

For engineers reviewing the MMA2301KEGR2 datasheet, MMA2301KEGR2 pinout, MMA2301KEGR2 application, or MMA2301KEGR2 equivalent, key selection criteria include its X-axis-only measurement capability, 360–440 Hz bandwidth, 1.0% FSO nonlinearity, on-chip status fault reporting, and SOIC-16 package compatibility with vibration monitoring and impact detection systems.

Technical Context

The MMA2301KEGR2 integrates a polysilicon g-cell transducer hermetically sealed at wafer level with a CMOS ASIC that implements switched-capacitor sensing, temperature compensation, and a 4-pole Bessel filter-preserving pulse shape integrity without external components. Its self-test applies electrostatic force to deflect the center plate, verifying mechanical and electrical functionality end-to-end.

Operation is ratiometric: output voltage scales linearly with both acceleration and supply voltage (V_OUT = V_DD/2 + S × g × V_DD). The STATUS pin latches high on EPROM parity error, clock monitor failure (50–260 kHz), or low-voltage detect (trip at 3.25 V), and resets only upon ST pin pulse if no active 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 footprint.

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 MMA2301KEGR2 uniquely combines high-g range, analog ratiometric output, factory-calibrated self-test, and AEC-Q100 qualification-making it irreplaceable in safety-critical automotive crash sensing where deterministic analog response and proven field reliability are mandatory.

Availability

MMA2301KEGR2 is available at Aetrix Electronics and suitable for automotive crash sensing, industrial vibration monitoring, consumer drop detection, and structural health logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMA2301KEGR2 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in sensor technology via its acquisition of Freescale.

The MMA series was designed specifically for high-reliability automotive safety systems-emphasizing robustness, built-in diagnostics, and AEC-Q100 compliance to meet stringent ASIL-B requirements in airbag control units and rollover detection.

FAQ

What is the primary sensing axis and full-scale range of the MMA2301KEGR2?

The MMA2301KEGR2 is a single-axis X-direction accelerometer with a full-scale range of ±200g. Its mechanical structure is oriented so that acceleration along the +X axis increases the output voltage above V_DD/2, while −X acceleration decreases it below V_DD/2. This directional sensitivity is fixed and marked on the top-side package silkscreen per the datasheet's front-view diagram. The MMA2301KEGR2 does not provide Y- or Z-axis measurement capability.

Does the MMA2301KEGR2 require external passive components for basic operation?

No, the MMA2301KEGR2 requires only two external components for reliable operation: a 0.1 µF ceramic decoupling capacitor between VDD and VSS, and an RC filter (1 kΩ + 0.01 µF) on VOUT to suppress switched-capacitor clock noise. All signal conditioning-including 4-pole Bessel filtering, temperature compensation, and zero-g offset trimming-is fully integrated. No external resistors, capacitors, or op-amps are needed to achieve specified performance.

How does the self-test function verify system integrity in the MMA2301KEGR2?

The MMA2301KEGR2 self-test applies a calibrated electrostatic force to the movable g-cell plate via the ST pin, producing a +24g-equivalent output step. This validates both mechanical deflection (transducer integrity) and electronic signal path (ASIC gain, offset, filtering). The resulting VOUT shift is measurable with a voltmeter or ADC. Critically, the STATUS pin also asserts during self-test, confirming fault-detection circuitry operation-making the MMA2301KEGR2 one of few accelerometers offering end-to-end diagnostic coverage.

What fault conditions cause the STATUS pin of the MMA2301KEGR2 to latch high?

The STATUS pin of the MMA2301KEGR2 latches high on three independent fault conditions: EPROM parity becoming odd (indicating memory corruption), clock frequency falling outside 50–260 kHz (signaling oscillator failure), or supply voltage dropping below the 3.25 V LVD trip point. Once latched, STATUS remains high until the ST pin receives a >100 µs high pulse-unless the underlying fault persists. This behavior is documented in Table 2 footnote 11 and ensures persistent fault visibility in safety-critical systems.

Is the MMA2301KEGR2 pin-compatible with other variants in the MMA2301 family?

Yes, the MMA2301KEGR2 shares identical SOIC-16 pinout, electrical characteristics, and mechanical footprint with MMA2301EG, MMA2301EGR2, and MMA2301KEG. The KEG suffix denotes Pb-free packaging, and R2 indicates tape-and-reel packaging-but all share the same Case 475-01 body, pin assignments, and functional block diagram. Engineers may substitute these variants without PCB layout changes, provided temperature and qualification requirements align (e.g., MMA2301KEGR2 and MMA2301EGR2 both meet AEC-Q100 Grade 2).