NXP Semiconductors MMA2301D

Overview

MMA2301D from Freescale Semiconductor is a surface-mount, silicon capacitive, micromachined single-axis (X-axis) accelerometer with ±200g full-scale range, 4th-order Bessel low-pass filter (f_-3dB = 360–440 Hz), ratiometric linear output (10.0 mV/g/V typical), and integrated self-test functionality. It operates from 4.75–5.25 V, draws 3.0–6.0 mA, and targets high-reliability vibration and impact monitoring in automotive and industrial systems.

For engineers reviewing the MMA2301D datasheet, MMA2301D pinout, MMA2301D application, or MMA2301D equivalent, key selection considerations include its factory-calibrated zero-g offset (2.5 V at V_DD = 5.0 V), transverse sensitivity ≤10% FSO, wafer-level hermetic sealing, and status-fault latching for low-voltage detection, clock monitor failure, or EPROM parity error.

Technical Context

The MMA2301D integrates a polysilicon g-cell transducer with a CMOS ASIC containing switched-capacitor signal conditioning, temperature compensation, and a 4-pole Bessel filter-eliminating external RC components. Its ratiometric architecture ensures output offset and sensitivity scale linearly with V_DD, enabling supply-noise rejection in microcontroller ADC interfaces.

Self-test is implemented via electrostatic actuation of the movable plate using a dedicated ST pin; the resulting deflection produces a calibrated 24g-equivalent output. Fault detection includes low-voltage detect (trip at 3.25 V), clock frequency monitoring (50–260 kHz), and EPROM parity checking-all latched to the STATUS pin and resettable by ST pulse.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), surface-mount, lead-free (Pb-free) compliant, wafer-level hermetically sealed.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL103 and MMA2201D, the MMA2301D uniquely combines ±200g range, integrated fault-latched STATUS output, and calibrated self-test in a production-qualified SOIC package-making it the only option among the three qualified for automotive airbag readiness verification and high-shock industrial logging.

Availability

MMA2301D is available at Aetrix Electronics and suitable for vibration monitoring systems, automotive safety diagnostics, industrial shock event logging, and predictive maintenance platforms requiring stable component supply across extended product lifecycles.

Supply support for MMA2301D 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, single-axis acceleration sensing in safety-critical and harsh-environment applications-emphasizing factory calibration, built-in diagnostics, and wafer-level hermeticity.

FAQ

What is the full-scale acceleration range of the MMA2301D?

The MMA2301D has a full-scale acceleration range of ±200g. This specification means the device outputs its minimum voltage (≈0.46×V_DD) at –200g and maximum voltage (≈0.54×V_DD) at +200g, with zero-g centered at V_DD/2. The ±200g range is factory-set and requires no external configuration, making the MMA2301D suitable for high-shock environments like drop testing and heavy machinery monitoring.

Does the MMA2301D require external passive components for filtering?

No, the MMA2301D does not require external passive components for its primary filtering function. It integrates a 4th-order switched-capacitor Bessel filter with a typical –3 dB bandwidth of 400 Hz. However, an external RC filter (1 kΩ + 0.01 µF) is recommended on the VOUT pin to suppress clock noise from the internal switched-capacitor circuitry-this is explicitly specified in the datasheet and critical for achieving clean analog output.

How does the self-test function work on the MMA2301D?

The MMA2301D self-test applies an electrostatic force to the movable g-cell plate via the ST pin. When a logic-high signal is applied to pin 4 (ST), a calibrated voltage generates a deflection equivalent to +24g acceleration along the X-axis. This produces a corresponding output shift on VOUT, verifying both mechanical integrity (g-cell movement) and electronic signal chain (ASIC conditioning, filtering, and output stage). The MMA2301D datasheet confirms this self-test is fully calibrated and repeatable.

What fault conditions trigger the STATUS pin on the MMA2301D?

The STATUS pin on the MMA2301D latches high when any of three fault conditions occur: supply voltage falling below 3.25 V (low-voltage detect), internal clock frequency dropping below 50 kHz (clock monitor fail), or EPROM parity becoming odd (memory corruption). The latch remains asserted until cleared by a rising edge on the ST pin-unless the underlying fault persists. This behavior is documented in Table 2 and the "Status" section of the MMA2301D datasheet.

Is the MMA2301D RoHS-compliant and lead-free?

Yes, the MMA2301D is RoHS-compliant and lead-free. The datasheet explicitly states that Pb-free versions (e.g., MMA2301EG) have identical functionality and electrical characteristics to non-Pb-free variants. The MMA2301D itself carries the D suffix and is manufactured in the same 16-lead SOIC package (Case 475-01) with wafer-level hermetic sealing, meeting JEDEC J-STD-020 moisture sensitivity level 3 requirements.