I. Introduction to the MMA7455 angular speed module
The MMA745 is a digital output (I2C/SPI), low-power, compact capacitive micro-machined accelerometer with signal conditioning, low-pass filter, temperature compensation, self-test, configurable pass-through pin (INT1 or INT2) Detection 0g, and pulse detection. Bias and sensitivity are factory configuration and no external components are required. The customer can use the specified 0g register and g-Select range selection to calibrate the 0g offset. The span can be commanded to select 3 acceleration ranges (2g/4g/8g). The MMA745xL series has a standby mode that makes it ideal for battery-powered handheld electronics.
The core of the MMA7455 digital triaxial acceleration sensor module is Freescale's MMA7455L digital triaxial acceleration sensor. The module design uses the official recommended design. The board card circuit is designed and optimized with high electromagnetic compatibility, and it has accurate output, small size, and reliable operation. All kinds of logos are clear, with good scalability. The MMA7455L chip is mounted on a printed circuit board (PCB) with DIP pins, which allows customers to integrate it into specific design applications to evaluate the product. This allows customers to flexibly evaluate devices within their own hardware and software environment.
Module parameters:
·Z axis self test
Low voltage operation: 2.4V – 3.6V
· User Reference Register for Offset Calibration
Programmable threshold interrupt output
·Level detection mode motion recognition (impact, shock, motion, free fall)
· Pulse detection mode single pulse or double pulse recognition
· Sensitivity 64 LSB/g @ 2g /8g 10-bit mode
·Optional sensitivity for 8-bit mode (±2g, ±4g, ±8g)
·Reliable design, high seismic resistance (5000g)
·Environmentally friendly products
·low cost
Target application:
Mobile/PMP/PDA: Image Stability, Text Scrolling
Mobile dialing, click mute
Hard Disk Drive (HDD): Free Fall Detection
Anti-theft, pedometer, motion sensing, fault recorder
Second, the wiring instructions
MMA7455 module is tested with our mini51V2.0
SCL of MMA7455 connects to P14 of the one-chip computer
SDA connected to the microcontroller P13
VCC connected to the development board 5V
GND is connected to the GND of the development board
Third, hardware test instructions
Master chip: STC89C52RC
Hardware environment: Mini51V2.0 development board + MMA7455 angular speed module
Test program: cepark MMA7455 test program. hex
Experimental phenomena:
The axis changes when the module is in a certain position
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