NXP Semiconductors MMA2241KEG

Overview

MMA2241KEG from Freescale Semiconductor is a silicon capacitive, micromachined X-axis accelerometer with ±10g range, 2-pole Bessel filter (f_–3dB = 400 Hz typ), ratiometric linear output (0.50 V_DD/g), and integrated self-test. It operates from –40°C to +125°C and is qualified to AEC-Q100 Grade 2 for automotive vibration monitoring.

For engineers reviewing the MMA2241KEG datasheet, MMA2241KEG pinout, MMA2241KEG application, or MMA2241KEG equivalent, key selection criteria include factory-trimmed zero-g offset and sensitivity, hermetic wafer-level sealing, status-fault latching, and SOIC-16 compatibility with no external passive components required for filtering.

Technical Context

The MMA2241KEG integrates a surface-micromachined polysilicon g-cell with a 1.2 µm CMOS ASIC containing capacitance-to-voltage conversion, two-stage switched-capacitor amplification, EPROM-trimmable gain/offset/temperature compensation, and a 2-pole switched-capacitor Bessel filter. The oscillator frequency-used to set filter cutoff-is trimmed via EPROM bias current control.

Fault detection includes low-voltage detect (trip at 3.25 V typ), clock monitor (150–400 kHz), and EPROM parity check; all trigger STATUS high. Self-test applies calibrated electrostatic force to the moveable plate, producing a 5.0 g-equivalent output shift verified by the same signal path used in normal operation.

Key Specifications

Pinout & Package

Package: 16-lead SOIC (Case 475-01), surface-mount, Pb-free termination, qualified per AEC-Q100 Grade 2 (–40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADXL206ARZ and MMA8451Q, the MMA2241KEG uniquely delivers factory-calibrated analog output with integrated Bessel filtering, self-test, and fault-latched STATUS-enabling drop-in replacement in AEC-Q100-compliant analog-sensing subsystems without redesigning signal conditioning or diagnostics.

Availability

MMA2241KEG is available at Aetrix Electronics and suitable for automotive airbag systems, industrial vibration monitoring, dynamic suspension control, and heavy-duty vehicle telematics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MMA2241KEG 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 semiconductor company specializing in embedded processing, sensors, and automotive ICs.

The MMA2241KEG belongs to Freescale's Xtrinsic™ family of intelligent sensors, designed specifically for high-reliability automotive and industrial motion sensing where analog output, diagnostic integrity, and AEC-Q100 compliance are mandatory.

FAQ

What is the operating temperature range of the MMA2241KEG?

The MMA2241KEG is rated for continuous operation from –40°C to +125°C and is qualified to AEC-Q100 Grade 2. This range covers under-hood automotive environments and industrial enclosures without derating. The device includes on-chip temperature compensation for both zero-g offset and sensitivity, maintaining specification compliance across the full range. All electrical parameters in Table 2 of the MMA2241KEG datasheet are guaranteed within this interval.

Does the MMA2241KEG require external components for basic operation?

No, the MMA2241KEG requires no external components for core functionality. Its 2-pole Bessel filter cutoff is set internally via factory-trimmed oscillator bias, and zero-g offset/sensitivity are EPROM-calibrated. However, recommended support components include a 0.1 µF decoupling capacitor on VDD and an RC filter (1 kΩ + 0.01 µF) on VOUT to suppress switched-capacitor clock noise-both specified in the MMA2241KEG datasheet layout guidelines.

How does the self-test function verify system integrity in the MMA2241KEG?

The MMA2241KEG self-test applies a calibrated electrostatic force to the moveable g-cell plate via the ST pin, inducing a 5.0 g-equivalent deflection. This stimulus traverses the full analog signal path-including capacitance-to-voltage conversion, amplification, filtering, and output buffering-producing a measurable output shift. Because the same circuitry used in normal operation processes the self-test response, it validates both mechanical integrity (g-cell) and electronic functionality (ASIC) in one test.

What fault conditions cause the STATUS pin of the MMA2241KEG to go high?

The STATUS pin of the MMA2241KEG goes high and latches when any of three fault conditions occur: low-voltage detect (V_DD < 3.25 V typ), clock frequency outside 150–400 kHz range, or EPROM trim register parity changing from even to odd. STATUS remains high until reset by a rising edge on ST-unless the underlying fault persists. During power-up, STATUS is invalid until the first ST edge occurs, as stated in the MMA2241KEG datasheet.

Is the MMA2241KEG pin-compatible with other devices in the MMA2241 family?

Yes, the MMA2241KEG shares identical pinout, package (SOIC-16, Case 475-01), and electrical interface with MMA2241EG, MMA2241EGR2, and MMA2241KEGR2. All variants use the same functional block diagram, pin descriptions, and layout recommendations. The KEG suffix denotes Pb-free termination and sourcing from a different manufacturing facility, but no changes to pin assignment, timing, or signal behavior are introduced-making them direct replacements in existing designs.