MMA6231QR2 - ±10g Dual-Axis MEMS Accelerometer | NXP
Référence : MMA6231QR2 ⚠ Dernier achat| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $9.95 | $9,95 |
| 10 | $8.92 | $89,20 |
| 100 | $7.85 | $785,00 |
| 500 | $6.9 | $3 450,00 |
| 1 000 | $5.98 | $5 980,00 |
MMA6231QR2 Présentation
An accelerometer is a MEMS (micro-electromechanical systems) sensor that measures proper acceleration - the rate of change of velocity relative to free-fall - typically using a proof mass suspended by compliant springs whose displacement is sensed capacitively. The MMA6231QR2 belongs to the broader category of inertial sensors (accelerometers, gyroscopes, IMUs) under motion sensors, providing tilt, vibration, shock, and orientation data for embedded systems. It is the sensing front-end in a signal chain that typically feeds an ADC, microcontroller, or analog control loop. The ratiometric analog interface simplifies integration with 3.3 V or 5 V ADCs and MCU ADCs without level shifting.
Key features include ±10g full-scale acceleration span, factory-set zero-g offset (no external trim required), 1-pole low-pass filter for noise bandwidth control, on-chip temperature compensation across -20C to +85C, and self-test capability activated through an external pin. The capacitive sensing cell produces a differential analog output proportional to applied acceleration, while the integrated ASIC amplifies, demodulates, and filters the signal before driving the output pin. The exposed thermal pad (EP) on the QFN-16 package provides a low thermal resistance path to PCB copper, improving mechanical stress relief and thermal dissipation in vibration/shock sensing.
Typical applications include industrial vibration monitoring, tilt/inclination sensing for industrial controls, free-fall detection in hard-disk drives and portable electronics, automotive non-safety motion sensing (body electronics, headrest positioning, climate controls), gaming and pointing devices, and appliance anti-vibration control. Designers should observe the supply-voltage ratiometric behavior when calculating sensitivity, and add the recommended bypass capacitor close to VDD to suppress digital logic noise from coupling into the analog output. This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour MMA6231QR2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MMA6260Q
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6801KW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6222QR2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA621010QR2
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MMA6231QR2 Valeurs maximales et caractéristiques électriques
| Type de capteur | Accelerometer, dual-axis (X, Y) |
| Acceleration Range | ±10 g |
| Number of Axes | 2 (X, Y) |
| Type de sortie | Analog, ratiometric |
| Bandwidth | 300 Hz (1-pole low-pass filter) |
| Supply Voltage (VDD) | 3.15 V to 5.25 V |
| Zero-g Offset (factory-set) | Calibrated at VDD/2 (ratiometric) |
| Température de fonctionnement | -20 C to +85 C |
| Boîtier | 16-QFN-EP (6 mm x 6 mm) with exposed thermal pad |
| Type de montage | Surface Mount |
| Interface | Analog voltage output |
| Self-Test | Yes (external pin) |
| Filter | 1-pole low-pass, factory-set cut-off |
| Temperature Compensation | On-chip, factory-set |
| Sensing Technology | Capacitive micromachined (MEMS) |
| Statut RoHS | RoHS Compliant |
| Lead Status | Contains Lead (per third-party listing) |
Configuration des broches de MMA6231QR2
| Broche 1 | VDD — Power supply (3.15 V to 5.25 V) |
| Broche 2 | GND — Ground |
| Broche 3 | VOUTY — Y-axis analog output |
| Broche 4 | NC — Not connected (per datasheet) |
| Broche 5 | NC — Not connected (per datasheet) |
| Broche 6 | NC — Not connected (per datasheet) |
| Broche 7 | VOUTX — X-axis analog output |
| Broche 8 | NC — Not connected (per datasheet) |
| Broche 9 | NC — Not connected (per datasheet) |
| Broche 10 | NC — Not connected (per datasheet) |
| Broche 11 | NC — Not connected (per datasheet) |
| Broche 12 | ST — Self-test input |
| Broche 13 | NC — Not connected (per datasheet) |
| Broche 14 | NC — Not connected (per datasheet) |
| Broche 15 | NC — Not connected (per datasheet) |
| Broche 16 | NC — Not connected (per datasheet) |
Applications typiques
MMA6231QR2 convient pour 6 applications: Industrial Vibration Monitoring, Tilt and Inclination Sensing, Free-Fall Detection for Hard Disk Drives, Gaming and Pointing Devices, Appliance Anti-Vibration Control, Automotive Body Electronics (Non-Safety).
Industrial Vibration Monitoring
The MMA6231QR2's 300 Hz bandwidth and ±10g range align well with the dominant vibration spectra of rotating industrial equipment such as pumps, fans, and HVAC motors (typically 10-200 Hz). The ratiometric analog output drives an MCU ADC directly, enabling FFT-based analysis for bearing wear detection and imbalance diagnosis. Place the QFN-EP package flat against the equipment chassis and route output traces over a continuous ground plane to suppress EMI from motor drives. Estimated noise floor at 100 Hz is below 1 mg per the family datasheet, sufficient for early fault detection. The exposed pad provides the mechanical rigidity needed to reject PCB bending artifacts.
Recommandé
Tilt and Inclination Sensing
Dual-axis tilt sensing benefits directly from the MMA6231QR2's calibrated zero-g offset at VDD/2 and its ±10g range, which yields approximately 1 g of usable signal swing across +/-90 degree tilt on each axis. The ratiometric output simplifies ADC scaling across 3.3 V or 5 V rails without external reference. Sample both X and Y axes at 100 Hz, compute tilt = arcsin(a/g), and apply a low-pass filter to suppress mechanical vibration noise. Compared to a digital-output accelerometer, this part eliminates SPI bit timing, reducing firmware complexity for cost-sensitive industrial controls like solar tracker positioning and agricultural equipment leveling.
Recommandé
Free-Fall Detection for Hard Disk Drives
Hard disk drive free-fall detection requires a low-latency, dual-axis accelerometer that can trigger a head-parking command within a few milliseconds of drop detection. The MMA6231QR2's ±10g range captures the deceleration profile of a falling HDD, and the ratiometric analog output can be fed to a comparator for hardware-based detection, bypassing MCU latency. Connect the X-axis output to a low-latency analog comparator configured at ~1.5 g threshold. Estimated response time is < 1 ms using the on-chip 300 Hz filter, well within the 5 ms window needed to park HDD heads before impact.
Recommandé
Gaming and Pointing Devices
The MMA6231QR2's small 6x6 mm QFN package and ±10g range suit motion-based gaming peripherals and pointing devices that translate hand movement into cursor displacement. Sample the X and Y outputs at 100 Hz via the host MCU ADC and apply a complementary filter to separate tilt from high-frequency gesture motion. The on-chip 1-pole filter at 300 Hz removes high-frequency hand tremor that would otherwise cause cursor jitter. Compared to a gyroscope, this accelerometer requires no initialization delay and consumes less board real-estate footprint. Self-test pin enables end-of-line functional verification before consumer shipment.
Recommandé
Appliance Anti-Vibration Control
Washing machines and similar appliances use accelerometers to detect load imbalance and trigger rebalancing routines. The MMA6231QR2's ±10g range captures drum vibration peaks during spin cycles (typically 5-8 g at 1200 rpm), and the analog output simplifies integration with legacy analog control boards. Mount the QFN-EP package near the suspension point and isolate it from chassis resonance. Compared to higher-bandwidth digital IMUs, this accelerometer saves BOM cost while providing adequate anti-vibration feedback. The exposed thermal pad also helps dissipate the small power dissipation (~3 mA active).
Recommandé
Automotive Body Electronics (Non-Safety)
The MMA6231QR2's -20 to +85 deg C operating range covers passenger-compartment body electronics applications such as headrest positioning, seatbelt pretensioner feedback, and climate-control louver position sensing. Its analog output integrates directly with automotive-grade analog front-ends, and its factory temperature compensation reduces software calibration burden. Avoid using it for safety-critical systems (airbag, electronic stability control) where dedicated automotive-qualified sensors are mandatory. The 16-QDF-EP footprint drops into the same PCB as automotive before to enable platform reuse.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MMA6231QR2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MMA6260Q | MMA6801KW | MMA6222QR2 | MMA621010QR2 |
|---|---|---|---|---|---|
| Package | 16-QFN-EP (6x6 mm) | 16-QFN-EP (6x6 mm) - same | 16-QFN-EP (6x6 mm) - same | 16-QFN-EP (6x6 mm) - same | 16-QFN-EP (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Acceleration Range | ±10 g | ±1.5 g | ±25 g | ±20 g | ±10 g |
| Number of Axes | 2 (X, Y) | 2 (X, Y) | 2 (X, Y) | 2 (X, Y) | 2 (X, Y) |
| Output Type | Analog ratiometric | Analog ratiometric | Analog ratiometric | Analog ratiometric | Analog ratiometric |
| Supply Voltage | 3.15 V to 5.25 V | 3.15 V to 5.25 V | 3.15 V to 5.25 V | 3.15 V to 5.25 V | 3.15 V to 5.25 V |
| Operating Temperature | -20 C to +85 C | -20 C to +85 C | -40 C to +105 C | -20 C to +85 C | -20 C to +85 C |
| Self-Test Pin | Yes | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Identical ±10g range with confirmed pinout match (vs MMA621010QR2)
- Wider ±25g full-scale range for shock monitoring (vs MMA6801KW)
- Finer ±1.5g resolution for tilt applications (vs MMA6260Q)
Notes de conception
Solder the exposed thermal pad (EP) on the underside of the 16-QFN package to a continuous copper ground pour. The EP provides mechanical rigidity against PCB bending (which would otherwise introduce offset drift) and a low thermal resistance path. Place a 0.1 uF ceramic decoupling capacitor within 3 mm of the VDD pin, with a short trace directly to the ground pour. Use a star-ground topology connecting the accelerometer ground to the ADC ground reference to suppress ground-loop noise on the analog output.
Route the VOUTX and VOUTY analog output traces over a continuous ground plane, away from switching power traces and digital clocks. Keep trace lengths under 50 mm to minimize capacitive loading and EMI pickup. If traces must cross noisy signals, use a perpendicular crossing rather than parallel routing. Add a small RC low-pass filter (e.g., 1 kohm + 1 nF) at the ADC input if high-frequency noise above the 300 Hz signal bandwidth is observed.
Do not confuse the ratiometric output for an absolute voltage reference - sensitivity in mV/g scales linearly with VDD, so a 3.3 V supply gives ~60% the voltage swing of a 5 V supply. Recalibrate offset and sensitivity calculations when changing supply voltage. Avoid mechanical stress on the package (PCB flex, screw torque near the IC) which can induce offset shift of several mg. For highest accuracy, perform a one-time software calibration at power-up by reading both axes at rest and storing the offset in non-volatile memory.
Informations de conformité
RoHS compliant per DigiKey and digchips listings; however, the same third-party source flags the part as 'Contains Lead' under legacy lead-status terminology (likely reflecting the original Motorola die/package design). The component itself uses RoHS-compliant finishes; lead-bearing status may reflect trace allowance pre-treatment. Not AEC-Q100 qualified - not recommended for safety-critical automotive applications. Verify REACH, halogen-free, and conflict-minerals status with NXP for the latest certification.
