Description

MMA8450QT is a three-axis, 8-bit/12-bit digital accelerometer in the category of accelerometers. It is a smart low-power component with embedded functions and flexible user programmable options. The accelerometer features 12 bits of resolution and is capable of saving power by utilizing embedded interrupt functions, relieving the host processor from continuously polling data.

Specifications and features

- 1.71V to 1.89V supply voltage

- ±2g/±4g/±8g dynamically selectable full-scale

- Output Data Rate (ODR) from 400 Hz to 1.563 Hz

- 375 μg/√Hz noise at normal mode ODR = 400 Hz

- 12-bit digital output

- I2C digital output interface (operates up to 400 kHz Fast Mode)

- Programmable two interrupt pins for eight interrupt sources

- Embedded four channels of motion detection

- Orientation (Portrait/Landscape) detection with hysteresis compensation

- Automatic ODR change for auto-wake and return-to-sleep

- 32 sample FIFO

- Self-Test

- 10,000g high shock survivability

- RoHS compliant

Application Scenarios

- Static orientation detection (portrait/landscape, up/down, left/right, back/front position identification)

- 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)

Comparison

- Smart low-power design

- Flexible user programmable options

- Embedded functions for power savings

- 12 bits of resolution

- Wide range of selectable full-scale options

- Programmable interrupt pins and motion detection channels

- Orientation detection with hysteresis compensation

- Automatic ODR change for power management

- High shock survivability

- RoHS compliant

- Limited to specific applications in the accelerometer category