NXP Semiconductors MMA1213EG

Overview

MMA1213EG from Freescale Semiconductor is a surface-mount, silicon capacitive, micromachined Z-axis accelerometer with integrated signal conditioning, 4th-order Bessel low-pass filtering, and factory-calibrated ±50g full-scale range. It delivers ratiometric linear output (38–42 mV/g), operates from 4.75–5.25 V, draws 3.0–6.0 mA, and functions across –40°C to +125°C for vibration and impact monitoring in harsh automotive and industrial environments.

For engineers reviewing the MMA1213EG datasheet, MMA1213EG pinout, MMA1213EG application, or MMA1213EG equivalent, key selection considerations include its SOIC-16 package, self-test capability, status fault reporting, low-voltage detect threshold (2.7–4.0 V), and 360–440 Hz bandwidth-critical for reliable structural health monitoring and safety-critical event detection.

Technical Context

The MMA1213EG implements a monolithic CMOS ASIC with a hermetically sealed poly-silicon g-cell transducer, using switched-capacitor techniques to measure differential capacitance changes induced by Z-axis acceleration. Its on-chip 4-pole Bessel filter ensures linear phase response and pulse shape integrity without external components.

Self-test is activated via a logic-high ST pin, applying electrostatic force to deflect the center plate and generate a calibrated 24g-equivalent output. Fault detection includes low-voltage detection (LVD), clock monitor (50–260 kHz), and EPROM parity checking-all latched to the STATUS pin and resettable via ST pulse.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), Pb-free, surface-mount compatible with standard reflow profiles. Footprint per Figure 7: 9.65 mm × 6.10 mm body, 1.27 mm lead pitch, 2.03 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL206 and MMA8452Q, the MMA1213EG uniquely combines high-g analog output, integrated diagnostics, and extended temperature operation - making it irreplaceable for safety-critical automotive and industrial impact sensing where digital interfaces or narrow ranges are insufficient.

Availability

MMA1213EG is available at Aetrix Electronics and suitable for automotive crash sensing, industrial vibration analytics, heavy-equipment impact logging, and railway structural health monitoring requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for MMA1213EG 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 sensors, specializing in automotive, industrial, and networking solutions before its 2015 acquisition.

The MMA series was developed specifically for high-reliability, single-axis acceleration sensing in safety-critical automotive systems-emphasizing built-in self-test, fault reporting, and operation across extreme ambient temperatures.

FAQ

What is the operating temperature range for the MMA1213EG?

The MMA1213EG operates across –40°C to +125°C, validated per Freescale's datasheet Table 2. This extended range supports under-hood automotive placement and industrial environments with high thermal stress. The device maintains specified performance-including sensitivity, offset, and bandwidth-throughout this range, with temperature compensation applied on-chip.

Does the MMA1213EG require external components for basic operation?

Yes-the MMA1213EG requires a 0.1 µF ceramic capacitor between VDD and VSS for power supply decoupling, and a 1 kΩ resistor + 0.01 µF capacitor RC filter on VOUT to suppress 70 kHz clock noise. These are mandatory per Figure 5 and Section "BASIC CONNECTIONS"; omitting them degrades noise performance and may cause aliasing in downstream ADC sampling.

How does the self-test function work on the MMA1213EG?

The MMA1213EG self-test applies an electrostatic force to the movable g-cell plate via the ST pin, producing a calibrated 24g-equivalent output step. When ST is driven high, the internal ASIC generates a known deflection, and the resulting VOUT shift confirms mechanical and electronic integrity. Response time is ≤36 ms, and STATUS reflects fault conditions during test execution.

What does the STATUS pin indicate on the MMA1213EG?

The STATUS pin on the MMA1213EG is an open-drain output that latches high upon occurrence of any fault: low-voltage detect (VDD < 2.7 V), clock oscillator failure (frequency < 50 kHz), or EPROM parity error. It remains asserted until reset by a ≥100 µs high pulse on ST-unless the underlying fault persists, ensuring persistent visibility of critical system errors.

Is the MMA1213EG RoHS-compliant and lead-free?

Yes-the "EG" suffix explicitly denotes the Pb-free, RoHS-compliant version of the MMA1213 device family. Per Freescale documentation, the MMA1213EG maintains identical electrical characteristics and functionality as the non-Pb-free MMA1213D variant, with no performance trade-offs introduced by the lead-free packaging process.