Overview
The MMA8451QR1, produced by NXP USA Inc., is a smart, low-power, three-axis, capacitive, micromachined accelerometer. This device features 14 bits of resolution and is designed to provide flexible user-programmable options. It is particularly useful for applications requiring precise motion detection and low power consumption. The MMA8451QR1 is available in a compact 16-pin QFN package, measuring 3 mm x 3 mm x 1 mm, making it suitable for a wide range of portable and embedded systems.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 1.95 V to 3.6 V |
| Interface Voltage | 1.6 V to 3.6 V |
| Full Scale Range | ±2 g, ±4 g, ±8 g (dynamically selectable) |
| Output Data Rates (ODR) | 1.56 Hz to 800 Hz |
| Noise | 99 μg/√Hz |
| Digital Output | 14-bit and 8-bit |
| Digital Interface | I2C |
| Interrupt Pins | Two programmable interrupt pins for seven interrupt sources |
| Package Type | 16-pin QFN (3 mm x 3 mm x 1 mm) |
| Operating Temperature | –40 °C to +85 °C |
| Current Consumption | 6 μA to 165 μA (typical) |
Key Features
- Embedded functions with flexible user-programmable options
- Configurable to two interrupt pins for seven interrupt sources
- Three embedded channels of motion detection: freefall, pulse, and jolt detection
- Orientation (portrait/landscape) detection with programmable hysteresis
- Automatic ODR change for auto-wake and return to sleep
- 32-sample FIFO with high-pass filter data available per sample
- Self-test capability
Applications
- E-compass applications
- Static orientation detection (portrait/landscape, up/down, left/right, back/front position identification)
- Notebook, e-reader, and laptop tumble and freefall detection
- Real-time orientation detection (virtual reality and gaming 3D user position feedback)
- Real-time activity analysis (pedometer step counting, freefall drop detection for HDD, dead-reckoning GPS backup)
- Motion detection for portable product power saving (auto-sleep and auto-wake for cell phone, PDA, GPS, gaming)
- Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)
- User interface (menu scrolling by orientation change, tap detection for button replacement)
Q & A
- What is the MMA8451QR1?
The MMA8451QR1 is a smart, low-power, three-axis, capacitive, micromachined accelerometer produced by NXP USA Inc. - What are the supply voltage and interface voltage ranges for the MMA8451QR1?
The supply voltage range is 1.95 V to 3.6 V, and the interface voltage range is 1.6 V to 3.6 V. - What are the full scale ranges available for the MMA8451QR1?
The full scale ranges are ±2 g, ±4 g, and ±8 g, which are dynamically selectable. - What is the output data rate range of the MMA8451QR1?
The output data rate (ODR) ranges from 1.56 Hz to 800 Hz. - How many interrupt pins does the MMA8451QR1 have?
The MMA8451QR1 has two programmable interrupt pins for seven interrupt sources. - What are some typical applications of the MMA8451QR1?
Typical applications include e-compass, static orientation detection, real-time orientation detection, real-time activity analysis, motion detection for power saving, and shock and vibration monitoring. - What is the package type and size of the MMA8451QR1?
The MMA8451QR1 is available in a 16-pin QFN package measuring 3 mm x 3 mm x 1 mm. - What is the operating temperature range of the MMA8451QR1?
The operating temperature range is –40 °C to +85 °C. - Does the MMA8451QR1 have any embedded motion detection channels?
Yes, it has three embedded channels for freefall, pulse, and jolt detection. - Is the MMA8451QR1 capable of automatic ODR change?
Yes, it can automatically change the ODR for auto-wake and return to sleep.
