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PDF MMA7455L Data sheet ( Hoja de datos )
| Número de pieza | MMA7455L | |
| Descripción | Three Axis Low-g Digital Output Accelerometer | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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Freescale Semiconductor
Technical Data
±2g/±4g/±8g Three Axis Low-g
Digital Output Accelerometer
The MMA7455L is a Digital Output (I2C/SPI), low power, low profile
capacitive micromachined accelerometer featuring signal conditioning, a low
pass filter, temperature compensation, self-test, configurable to detect 0g
through interrupt pins (INT1 or INT2), and pulse detect for quick motion
detection. 0g offset and sensitivity are factory set and require no external
devices. The 0g offset can be customer calibrated using assigned 0g registers
and g-Select which allows for command selection for 3 acceleration ranges
(2g/4g/8g). The MMA7455L includes a Standby Mode that makes it ideal for
handheld battery powered electronics.
Features
• Digital Output (I2C/SPI)
• 3mm x 5mm x 1mm LGA-14 Package
• Self-Test for Z-Axis
• Low Voltage Operation: 2.4 V – 3.6 V
• User Assigned Registers for Offset Calibration
• Programmable Threshold Interrupt Output
• Level Detection for Motion Recognition (Shock, Vibration, Freefall)
• Pulse Detection for Single or Double Pulse Recognition
• Sensitivity (64 LSB/g @ 2g and @ 8g in 10-Bit Mode)
• Selectable Sensitivity (±2g, ±4g, ±8g) for 8-bit Mode
• Robust Design, High Shocks Survivability (5,000g)
• RoHS Compliant
• Environmentally Preferred Product
• Low Cost
Typical Applications
• Cell Phone/PMP/PDA: Image Stability, Text Scroll, Motion Dialing,
Tap to Mute
• HDD: Freefall Detection
• Laptop PC: Freefall Detection, Anti-Theft
• Pedometer
• Motion Sensing, Event Recorder
Part Number
MMA7455LT
MMA7455LR1
MMA7455LR2
ORDERING INFORMATION
Temperature Range Package
–40 to +85°C
LGA-14
–40 to +85°C
LGA-14
–40 to +85°C
LGA-14
Shipping
Tray
7” Tape & Reel
13” Tape & Reel
Document Number: MMA7455L
Rev 10, 12/2009
MMA7455L
MMA7455L: XYZ-AXIS
ACCELEROMETER
±2g/±4g/±8g
Bottom View
14 LEAD
LGA
CASE 1977-01
Top View
DVDD_IO
GND
N/C
IADDR0
GND
AVDD
SDA/SDI/SDO
SDO
N/C
N/C
INT2
INT1/DRDY
Figure 1. Pin Connections
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-2009. All rights reserved.
1 page  
Table 1. Pin Descriptions
Pin # Pin Name
Description
Pin Status
1 DVDD_IO Digital Power for I/O pads
Input
2
GND
Ground
Input
3 N/C No internal connection. Leave unconnected or connect to Ground.
Input
4
IADDR0
I2C Address Bit 0 (optional)*
Input
5
GND
Ground
Input
6
AVDD
Analog Power
Input
7 CS SPI Enable (0), I2C Enable (1)
Input
8 INT1/DRDY Interrupt 1/ Data Ready
Output
9
INT2
Interrupt 2
Output
10 N/C No internal connection. Leave unconnected or connect to Ground.
Input
11 N/C Leave unconnected or connect to Ground.
Input
12
SDO
SPI Serial Data Output
Output
13 SDA/SDI/SDO I2C Serial Data (SDA), SPI Serial Data Input (SDI), 3-wire interface Serial Data Output (SDO) Open Drain/Input/Output
14 SCL/SPC I2C Serial Clock (SCL), SPI Serial Clock (SPC)
Input
*This address selection capability is not enabled at the default state. If the user wants to use it, factory programming is required. If activated (pin4
on the device is active).
<$1D= 0001 1101> bit 0 is VDD on pin 4
<$1C=0001 1100> bit 0 is GND on pin 4. If the pin is programmed it cannot be left NC.
Figure 2. Simplified Accelerometer Functional Block Diagram
Sensors
Freescale Semiconductor
MMA7455L
5
5 Page 
THRESHOLD DETECTION FOR MOTION AND FREEFALL CONDITIONS
CASE 1: Motion Detection
Integer Value: X >Threshold OR Y >Threshold OR Z > Threshold
Reg $18 THOPT=1; Reg 19 LDPL=0, Set Threshold to 3g, which is 47 counts (16 counts/g). Set register $1A LDTH = $2F.
TH = $2F
CASE 2: Motion Detection
Absolute: ||X|| > Threshold OR ||Y|| >Threshold OR ||Z|| > Threshold
Reg $18 THOPT=0; Reg 19 LDPL=0, Set Threshold to 3g, which is 47 counts (16 counts/g). Set register $1A LDTH = $2F.
TH = $2F
TH = $D1
CASE 3: Freefall Detection
Integer Value: X < Threshold AND Y < Threshold AND Z <Threshold
Reg $18 THOPT=1; Reg 19 LDPL=1, Set Threshold to 0.5g, which is 7 counts (16 counts/g). Set register $1A LDTH = $07
TH = $07
CASE 4: Freefall Detection
Absolute: ||X|| <Threshold AND ||Y|| < Threshold AND ||Z||< Threshold
Reg $18 THOPT=0; Reg 19 LDPL=1, Set Threshold to +/-0.5g, which is 7 counts (16 counts/g). Set register $1A LDTH = $07.
TH = $07
TH = $F9
Sensors
Freescale Semiconductor
MMA7455L
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MMA7455L.PDF ] | |
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