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NXP Semiconductors MMA3221EGR2
- Part No.:
- MMA3221EGR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Accelerometers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MMA3221EGR2.pdf
- Description:
- ACCEL 50G/20G ANALOG 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,413
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Product details
Overview
MMA3221EGR2 from NXP Semiconductors (formerly Freescale) is a dual-axis surface-micromachined capacitive accelerometer with integrated signal conditioning, factory-calibrated ±50g X-axis and ±20g Y-axis full-scale range, 4th-order Bessel low-pass filter (360–440 Hz), and ratiometric linear analog outputs. It operates across –40°C to +125°C and is used in hard drive protection, impact monitoring, and appliance control systems.
For engineers reviewing the MMA3221EGR2 datasheet, MMA3221EGR2 pinout, MMA3221EGR2 application, or MMA3221EGR2 equivalent, this page delivers verified technical context, SOIC-20 pin mapping, self-test and status functionality, AEC-Q100 Grade 2 qualification, and real-world design implications for vibration sensing and mechanical integrity verification.
Technical Context
The MMA3221EGR2 integrates a polysilicon MEMS g-cell with a CMOS ASIC using switched-capacitor techniques to measure differential capacitance changes and produce calibrated voltage outputs proportional to acceleration. Its on-chip 4-pole Bessel filter preserves pulse shape integrity without external components.
It features independent XOUT and YOUT analog outputs referenced to VDD/2 at zero-g, with built-in self-test (ST pin-triggered electrostatic deflection), fault detection (low-voltage detect, clock monitor, EPROM parity check), and latched STATUS output that requires ST pulse reset unless fault persists.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acceleration Range | X-axis ±50g, Y-axis ±20g - defines measurable dynamic range for impact/vibration events in two orthogonal axes |
| Output Sensitivity | X: 40 mV/g, Y: 100 mV/g - determines analog output voltage per g of acceleration, enabling direct ADC scaling |
| Zero-g Output | X: 2.5 V, Y: 2.5 V at VDD = 5.0 V - establishes mid-supply reference point for bidirectional acceleration measurement |
| Bandwidth (–3 dB) | 360–440 Hz - sets maximum usable frequency for transient shock detection without phase distortion |
| Supply Voltage | 4.75–5.25 V - defines narrow regulated rail requirement; operation outside this range invalidates calibration |
| Operating Temperature | –40°C to +125°C - supports under-hood automotive and industrial environments per AEC-Q100 Grade 2 |
| Self-test Response | 9.6–14.4 g equivalent output - provides deterministic mechanical-electrical verification without external stimulus |
Pinout & Package
Package: 20-pin SOIC (Case 475A-02), surface-mount, tape-and-reel packaging (R2 suffix). Hermetically sealed wafer-level cap ensures long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 4, 12–16, 17–19 | No internal connection (N/C) | Must be left floating; no PCB routing or grounding required |
| 5 ST | Self-test logic input | Active-high trigger (≥0.7×VDD) initiates calibrated electrostatic deflection; also resets STATUS latch |
| 6 XOUT | Analog output (X-axis) | Ratiometric voltage output centered at VDD/2; requires RC filter (1 kΩ + 0.01 µF) to suppress clock noise |
| 7 STATUS | Fault/status logic output | Open-drain output latches high on LVD, clock failure, or EPROM parity error; reset via ST pulse |
| 8 VSS | Analog ground reference | Dedicated AGND pin; must be isolated from digital ground to minimize noise coupling into sensor path |
| 9 VDD | Digital supply input | Primary 4.75–5.25 V power rail; decoupled with 0.1 µF capacitor close to pin |
| 10 AVDD | Analog supply input | Separate analog power rail; improves PSRR and reduces supply-induced offset drift |
| 11 YOUT | Analog output (Y-axis) | Independent ratiometric output identical in structure to XOUT; enables simultaneous dual-axis acquisition |
| 20 GND | Power ground | System ground return; tied to VSS internally but routed separately on PCB for noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated dual-axis sensitivity | Eliminates need for system-level trimming; X/Y ranges optimized for asymmetric motion profiles (e.g., HDD drop vs. joystick tilt) |
| Onboard 4th-order Bessel filter | Preserves time-domain fidelity of shock pulses-critical for accurate peak-g detection in impact monitoring |
| Integrated self-test with electrostatic actuation | Verifies full signal chain (MEMS + ASIC) in situ; avoids costly field failures in safety-critical applications |
| AEC-Q100 Grade 2 qualification | Validated for automotive under-hood use up to +125°C ambient; includes temperature-compensated offset and sensitivity |
| Hermetic wafer-level sealing | Prevents moisture and particle ingress over lifetime; enables >10-year reliability in consumer and industrial deployments |
Applications
| Hard Drive Protection | Appliance Vibration Control |
|---|---|
Use Scenario: Detects free-fall or sudden impact during laptop movement to park read/write heads before physical contact. IC Role / Device Role / Timing Role: Dual-axis analog accelerometer providing real-time g-level data to host controller for immediate mechanical response. Use Value: Prevents head crash damage by triggering park sequence within <100 ms of ≥2g event-enabled by fast self-test validation and stable zero-g offset. |
Use Scenario: Monitors drum imbalance and bearing wear in washing machines to adjust spin speed or halt operation before structural failure. IC Role / Device Role / Timing Role: Low-noise analog sensor feeding microcontroller ADC for FFT-based spectral analysis of vibration harmonics. Use Value: Extends machine lifespan by detecting 5–10% amplitude increase in 60 Hz fundamental frequency-achievable via ±20g Y-axis sensitivity and <110 mVrms noise floor. |
| Automotive Airbag Pre-Crash Sensing | Sports Motion Analysis |
Use Scenario: Captures pre-impact vehicle deceleration profile to supplement primary crash sensors and enable multi-stage airbag deployment timing. IC Role / Device Role / Timing Role: Secondary inertial sensor with AEC-Q100 Grade 2 qualification, delivering validated acceleration data to airbag ECU. Use Value: Improves collision severity classification accuracy by correlating X/Y axis transients-supported by transverse sensitivity <10% FSO and factory-trimmed cross-axis rejection. |
Use Scenario: Embedded in athletic wearables to capture joint-angle dynamics and impact forces during training or rehabilitation. IC Role / Device Role / Timing Role: Dual-axis analog interface for wearable MCU with minimal external components-leveraging ratiometric output and internal filtering. Use Value: Enables battery-efficient operation with 6–10 mA supply current and no external passive components, while maintaining ±50g X-axis range for sprint/jump analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-axis analog accelerometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADXL202E/ADXL202AE (Analog Devices) | ±2g/±2g range, PWM output (not analog), 50–2000 Hz bandwidth, no self-test | Lower-range motion tracking only; unsuitable for impact detection requiring ±50g | Select when cost-sensitive, low-g, digital-output systems dominate and self-test is non-critical |
| MMA8451Q (NXP) | Digital I²C output, ±2/±4/±8g programmable range, embedded FIFO, motion detection engine | Requires host processor for data parsing; lacks analog immediacy and deterministic self-test | Choose for smart sensor nodes needing low-power wake-on-motion and firmware-configurable settings |
Compared with ADXL202E and MMA8451Q, the MMA3221EGR2 delivers fixed high-range analog outputs with guaranteed pulse fidelity and hardware-verified self-test-making it uniquely suited for deterministic, real-time impact response where latency and validation integrity are critical.
Availability
MMA3221EGR2 is available at Aetrix Electronics and suitable for hard drive protection, appliance vibration control, and automotive pre-crash sensing requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for MMA3221EGR2 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
NXP Semiconductors acquired Freescale in 2015 and continues its legacy of high-reliability sensor ICs for automotive, industrial, and consumer applications.
The MMA3221EGR2 belongs to NXP's legacy Xtrinsic™ analog sensor family, designed specifically for robust, self-validating inertial measurement in mechanically demanding environments where calibration stability and fault visibility are mandatory.
FAQ
What is the operating supply voltage range for the MMA3221EGR2?
The MMA3221EGR2 requires a regulated supply between 4.75 V and 5.25 V for guaranteed calibration and specification compliance. Operation outside this range may yield linear output but invalidates factory calibration-confirmed in Table 2 of the official datasheet. The MMA3221EGR2 draws 6–10 mA typical current and uses separate VDD (digital) and AVDD (analog) rails to minimize noise coupling.
Does the MMA3221EGR2 support true bidirectional acceleration measurement?
Yes-the MMA3221EGR2 provides true ±50g (X) and ±20g (Y) measurement capability. At zero acceleration, both XOUT and YOUT rest at VDD/2 (e.g., 2.5 V at 5.0 V supply); positive acceleration increases output above VDD/2, negative acceleration decreases it below VDD/2. This ratiometric behavior is explicitly defined in Table 2's "Output Signal" section and confirmed by Figure 4's equivalent circuit model.
How does the self-test function work on the MMA3221EGR2?
The MMA3221EGR2 self-test applies an electrostatic force to the MEMS center plate via the ST pin, producing a calibrated 9.6–14.4 g equivalent output on both XOUT and YOUT. This verifies mechanical deflection and full signal chain integrity-including ASIC gain, filtering, and output stage-without external equipment. The STATUS pin reflects test initiation and faults, and a 100 µs ST pulse resets latched faults if no active condition remains.
What is the purpose of the separate AVDD and VDD pins on the MMA3221EGR2?
The MMA3221EGR2 uses AVDD for analog circuitry (g-cell interface, filters, output buffers) and VDD for digital logic (self-test control, status latch, EPROM). This separation improves power supply rejection ratio (PSRR) and prevents digital switching noise from modulating analog output offset or gain-critical for maintaining <±1.0% FSO nonlinearity and stable zero-g output across temperature.
Is the MMA3221EGR2 pin-compatible with the MMA3221EG or MMA3221KEG variants?
Yes-the MMA3221EGR2 shares identical SOIC-20 (Case 475A-02) pinout, electrical specifications, and functional behavior with MMA3221EG and MMA3221KEG. Differences are limited to packaging (tape-and-reel), manufacturing facility (KEG suffix), and Pb-free compliance (KEG). All variants use the same die, pin mapping, and datasheet revision (Rev 1, Nov 2012), confirming full functional and mechanical interchangeability.
MMA3221EGR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- MMA3221
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Analog
- Axis:
- X, Y
- Acceleration Range:
- ±50g (X), ±20g (Y)
- Sensitivity (LSB/g):
- -
- Sensitivity (mV/g):
- 40 (X), 100 (Y)
- Bandwidth:
- 400Hz
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MMA3221EGR2 FAQ
1.How can I place an order for MMA3221EGR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMA3221EGR2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMA3221EGR2 reliable?
The price and inventory of MMA3221EGR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMA3221EGR2 is usually 5 days.
3.What payment methods are accepted for MMA3221EGR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMA3221EGR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMA3221EGR2?
MMA3221EGR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMA3221EGR2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMA3221EGR2?
For technical support, including MMA3221EGR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMA3221EGR2 requirements.
6.How does Aetrix verify that MMA3221EGR2 is sourced from the original manufacturer or authorized distributors?
All MMA3221EGR2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMA3221EGR2 meets industry standards.
7.What is the process for return or replacement of MMA3221EGR2?
All MMA3221EGR2 units undergo pre-shipment inspection (PSI). If there is an issue with MMA3221EGR2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMA3221EGR2 part is unused and in its original packaging.
Return procedure for MMA3221EGR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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