NXP Semiconductors MMA1213D

Overview

MMA1213D from Freescale Semiconductor (formerly Motorola) is a surface-micromachined, silicon capacitive Z-axis accelerometer with integrated signal conditioning, 4th-order Bessel low-pass filtering, and factory-calibrated self-test. It delivers ±50g measurement range, ratiometric linear output (38–42 mV/g), and operates from –40°C to +125°C on 4.75–5.25 V supply. Used in automotive airbag systems for impact detection.

For engineers reviewing the MMA1213D datasheet, MMA1213D pinout, MMA1213D application, or MMA1213D equivalent, key selection criteria include its SOIC-16 package, 360–440 Hz bandwidth, status-fault latching capability, and calibrated self-test functionality verified at 20g.

Technical Context

The MMA1213D integrates a polysilicon micromachined g-cell transducer with a CMOS ASIC using switched-capacitor techniques to measure differential capacitance change and produce a voltage output proportional to acceleration. Its hermetically sealed wafer-level packaging ensures long-term reliability under high-shock conditions.

It implements a ratiometric architecture where zero-g offset (2.35–2.65 V at VDD = 5.0 V) and sensitivity (0.46–0.54 VDD mV/g/V) scale linearly with supply voltage, enabling system-level cancellation of supply-induced ADC errors. The Status pin latches high on Low Voltage Detect (2.7–4.0 V trip), clock monitor failure (<50 kHz or >260 kHz), or EPROM parity error.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475–01), surface-mount, 10.15–10.45 mm × 7.40–7.60 mm body size, 1.27 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL202E and MMA8452Q, the MMA1213D uniquely combines Z-axis ±50g analog output, factory-calibrated self-test, and fault-latched STATUS signaling in a 5 V SOIC package-making it irreplaceable in certified automotive crash-sensing modules where analog integrity and diagnostic coverage are mandated.

Availability

MMA1213D is available at Aetrix Electronics and suitable for automotive airbag deployment, industrial vibration monitoring, impact event recording, and high-shock structural testing requiring stable component supply over extended production lifecycles.

Supply support for MMA1213D 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 and analog/mixed-signal ICs, with deep expertise in automotive, industrial, and sensor technologies.

The MMA series was developed specifically for high-reliability automotive safety applications, emphasizing calibrated self-test, fault diagnostics, and hermetic packaging to meet stringent AEC-Q100 requirements.

FAQ

What is the operating temperature range of the MMA1213D?

The MMA1213D operates across –40°C to +125°C, validated for continuous use in under-hood automotive environments and industrial settings with wide thermal excursions. This range is specified in the device's ordering information and confirmed in the Maximum Ratings table, supporting reliable performance in demanding applications such as airbag control units and engine-mounted vibration monitors.

Does the MMA1213D require external passive components for filtering?

No, the MMA1213D integrates a 4-pole switched-capacitor Bessel filter with factory-set cutoff frequency; no external resistors or capacitors are needed to configure bandwidth. However, an external RC filter (1 kΩ + 0.01 µF) is recommended on VOUT to suppress clock noise from the internal oscillator-this is explicitly stated in the Operating Characteristics note and Basic Connections section.

How does the self-test function verify system integrity in the MMA1213D?

The MMA1213D self-test applies a calibrated electrostatic force to the micromachined g-cell center plate via the ST pin, producing a known 24–36 g equivalent output. This validates both mechanical deflection (g-cell) and electronic signal path (ASIC, filter, output stage). The STATUS pin also confirms connectivity between ST and STATUS pins, ensuring end-to-end diagnostic coverage required in automotive airbag systems.

What fault conditions trigger the STATUS pin on the MMA1213D?

The STATUS pin on the MMA1213D latches high when any of three fault conditions occur: supply voltage drops below the Low Voltage Detect threshold (2.7–4.0 V), internal clock frequency falls outside 50–260 kHz, or EPROM parity becomes odd. The latch remains asserted until reset by a ≥100 µs high pulse on ST-unless the underlying fault persists, as documented in the Operating Characteristics and SPECIAL FEATURES sections.

Is the MMA1213D pin-compatible with other devices in the MMA family?

The MMA1213D shares the same SOIC-16 package and pinout with MMA1213DR2 (tape-and-reel variant), but is not pin-compatible with other MMA-series accelerometers like MMA1220D or MMA1260D, which differ in axis configuration, sensitivity, and internal circuitry. Pin compatibility is limited strictly to identical-ordering variants-no cross-family pin mapping is supported per the official datasheet.