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MMA8451QR1

3-axis 14-bit digital accelerometer, ±2g/±4g/±8g, I2C, 99µg/√Hz, QFN-16, with embedded motion detection

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Pieza del fabricante：

MMA8451QR1

Paquete：

QFN-16 (3 x 3 x 1 mm)

Marca：
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Descripción

Productos

The MMA8451QR1 is an NXP 3-axis 14-bit digital accelerometer in a compact QFN-16 package. With dynamically selectable ±2g/±4g/±8g full-scale ranges, I2C digital output, and rich embedded functions including orientation detection, freefall/motion/pulse detection, and a 32-sample FIFO, it is designed for consumer electronics, industrial, and medical motion sensing applications.

Especificaciones

Accelerometer Axes 3-axis (X, Y, Z)
Resolution 14-bit / 8-bit selectable
Full-Scale Range ±2g / ±4g / ±8g (dynamic)
Sensitivity 4096 counts/g (±2g)
Output Data Rate 1.56 Hz to 800 Hz
Noise Density 99 µg/√Hz
Interface I2C (up to 2.25 MHz)
Tensión de alimentación 1.95V to 3.6V
Current Consumption 6 µA (low-power) to 165 µA
FIFO 32 samples
Temperatura de funcionamiento -40°C to +85°C
Paquete QFN-16 (3 x 3 x 1 mm)

Características

  • 14-bit resolution provides 0.25 mg/LSB sensitivity in ±2g mode for precision tilt sensing
  • Embedded motion processing: freefall detection, pulse/tap detection, orientation detection
  • 32-sample FIFO buffer reduces host MCU interrupt frequency and power consumption
  • Ultra-low power: 6 µA in low-power mode at 1.56 Hz ODR for always-on sensing
  • Auto-wake/sleep mode automatically transitions between low-power and high-performance modes
  • High-pass filtered data available per sample for transient detection without MCU processing

Aplicaciones

  • Smartphone screen rotation and portrait/landscape orientation detection
  • Wearable device step counting and activity recognition
  • Laptop freefall detection for hard drive head parking
  • Industrial vibration monitoring and tilt measurement
  • Medical patient fall detection in elderly care systems

The MMA8451QR1 is an NXP 3-axis capacitive MEMS accelerometer with 14-bit digital output, dynamically selectable ±2g/±4g/±8g full-scale ranges, and I2C interface in a 3 x 3 x 1 mm QFN-16 package. The device integrates sophisticated embedded functions including freefall/motion detection, pulse/tap detection, and orientation (portrait/landscape) detection with programmable hysteresis, all operating independently of the host MCU. A 32-sample FIFO buffer, auto-wake/sleep mode, and ultra-low current consumption (6 µA at 1.56 Hz) make it ideal for battery-powered consumer, industrial, and medical motion sensing applications.

The MMA8451QR1 uses capacitive MEMS sensing elements where proof masses suspended by silicon springs deflect under acceleration, changing the capacitance between fixed and moving electrodes. This capacitance change is converted to a voltage by a sigma-delta C-to-V converter, then digitized by a 14-bit ADC. The digital signal passes through a configurable signal processing chain including selectable low-pass/high-pass filters and a 32-sample FIFO. Embedded motion detection engines analyze the acceleration data independently: the orientation engine detects portrait/landscape rotation, the pulse engine detects single/double taps, and the transient/freefall engine detects sudden motion or zero-g conditions — all generating interrupts without host MCU intervention.

Pin Función
VDD Digital power supply (1.95-3.6V)
VDDIO I/O voltage supply (1.6-3.6V, sets I2C levels)
GND Ground (multiple pins)
SCL I2C serial clock input
SDA I2C serial data I/O
SA0 I2C address select (LSB)
INT1 Programmable interrupt output 1
INT2 Programmable interrupt output 2
BYP Internal regulator bypass capacitor
  • Smartphone screen auto-rotation using embedded orientation detection with hysteresis
  • Wearable fitness tracker step counting via embedded motion/pulse detection
  • Laptop HDD freefall protection with automatic drive head parking interrupt
  • Smart home door/window open detection via vibration/orientation sensing
  • Elderly fall detection pendant with emergency alert via freefall detection
Modelo Fabricante Diferencia clave
MMA8452QR1 NXP 12-bit version, lower cost
MMA8453QR1 NXP 10-bit/8-bit version, lowest cost
MMA8652FCR1 NXP 12-bit automotive variant
ADXL345BCCZ Dispositivos analógicos Alternative 3-axis 13-bit digital accelerometer
LIS3DHTR STMicroelectronics Alternative 3-axis 12-bit ultra-low-power accelerometer
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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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