NXP Semiconductors MMA3201KEG

Overview

MMA3201KEG from Freescale Semiconductor is a dual-axis (X/Y) surface-micromachined capacitive accelerometer with integrated signal conditioning, 4th-order Bessel low-pass filtering, and factory-calibrated ±40g full-scale range. It delivers ratiometric analog outputs (XOUT/YOUT), operates from 4.75–5.25 V, draws 6–10 mA, and is qualified to AEC-Q100 Grade 2 (–40°C to +105°C) for automotive and industrial vibration monitoring.

For engineers reviewing the MMA3201KEG datasheet, MMA3201KEG pinout, MMA3201KEG application, or MMA3201KEG equivalent, key selection criteria include its SOIC-20 package, self-test capability with STATUS fault latching, low-noise output (110 mV_RMS, 0.01 Hz–1 kHz), and built-in clock monitor and low-voltage detection.

Technical Context

The MMA3201KEG integrates a polysilicon g-cell transducer hermetically sealed at wafer level and a CMOS ASIC performing switched-capacitor sensing, gain, temperature compensation, and 4-pole Bessel filtering. Its ratiometric output scales linearly with supply voltage (0.46–0.54 × V_DD per g), and zero-g offset is factory-trimmed to 2.35–2.65 V at V_DD = 5.0 V.

Self-test applies electrostatic force to deflect the center plate, producing a calibrated 10–14.4 g output shift; STATUS pin latches high on EPROM parity error, clock frequency failure (<50 kHz or >260 kHz), or low-voltage detection (trip at 2.7–4.0 V), and resets only via ST pulse if faults persist.

Key Specifications

Pinout & Package

Package: 20-lead SOIC (Case 475A-02), 0.380-inch body width, lead pitch 1.27 mm, RoHS-compliant Pb-free (KEG suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL202E and MMA8451Q, the MMA3201KEG provides higher full-scale range (±40g vs. ≤±8g), true analog ratiometric outputs eliminating signal conditioning overhead, and integrated fault diagnostics-making it optimal for ruggedized vibration and impact monitoring where analog fidelity and system-level health reporting are critical.

Availability

MMA3201KEG is available at Aetrix Electronics and suitable for vibration monitoring, impact detection, and hard drive protection applications requiring stable component supply, automotive-grade reliability, and long-lifecycle support.

Supply support for MMA3201KEG 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 global leader in embedded processing and sensor solutions, specializing in automotive, industrial, and IoT applications.

The MMA3201KEG belongs to Freescale's Xtrinsic™ family of intelligent sensors, designed specifically for high-reliability motion sensing in automotive safety systems, industrial condition monitoring, and consumer device protection.

FAQ

What is the operating temperature range for the MMA3201KEG?

The MMA3201KEG is qualified to AEC-Q100 Grade 2 with an operating temperature range of –40°C to +105°C. This specification is validated across all electrical parameters in Table 2 of the datasheet, including sensitivity, zero-g offset, and supply current, ensuring reliable performance in under-hood automotive and industrial environments where thermal stress is significant. The MMA3201KEG maintains ratiometric linearity and self-test functionality throughout this full range.

Does the MMA3201KEG require external passive components for filtering?

No, the MMA3201KEG integrates a 4th-order switched-capacitor Bessel filter with a fixed 360–440 Hz –3 dB bandwidth. This eliminates the need for external resistors or capacitors to set cutoff frequency. However, Freescale recommends adding a 1 kΩ resistor and 0.01 µF capacitor RC filter on each output (XOUT/YOUT) to suppress clock noise from the internal switched-capacitor circuitry-this is a noise-reduction measure, not a filter configuration requirement. The MMA3201KEG's internal filter alone satisfies pulse shape integrity requirements.

How does the STATUS pin function on the MMA3201KEG?

The STATUS pin on the MMA3201KEG is an open-drain output that latches high upon occurrence of any fault: low-voltage detection (V_DD < 2.7 V), clock frequency outside 50–260 kHz, or EPROM parity error. It also goes high during active self-test. To clear a latched fault, a ≥100 µs high pulse must be applied to ST-STATUS returns low only if the fault condition has resolved. This behavior is documented in Table 2 footnote 11 and Figure 1's functional block diagram. The MMA3201KEG uses STATUS for system-level health monitoring without requiring continuous polling.

What is the meaning of the 'KEG' suffix in MMA3201KEG?

Per Freescale's ordering information table, the 'KEG' suffix denotes a Pb-free (RoHS-compliant) version of the MMA3201 series packaged in SOIC-20 (Case 475A-02). It indicates the device was sourced from a different manufacturing facility than the 'EG' variant but shares identical electrical specifications, pinout, and qualification. The MMA3201KEG retains full AEC-Q100 Grade 2 compliance and all functional features-including self-test, STATUS fault reporting, and ratiometric output-without compromise due to the Pb-free construction.

Can the MMA3201KEG be used in battery-powered applications?

Yes, the MMA3201KEG draws 6–10 mA typical supply current at 4.75–5.25 V, making it suitable for mains-powered or high-capacity battery systems like industrial handheld testers or automotive diagnostic tools. While not optimized for ultra-low-power operation (e.g., coin-cell lifetime), its robust self-test and fault-monitoring features reduce need for external supervision circuitry-lowering overall system power budget. For true low-power designs, consider alternatives like the MMA8451Q. The MMA3201KEG's value lies in analog fidelity and diagnostic completeness, not minimal quiescent current.