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PDF MMA8451Q Data sheet ( Hoja de datos )
| Número de pieza | MMA8451Q | |
| Descripción | 14-bit 8-bit Digital Accelerometer | |
| Fabricantes | Freescale Semiconductor | |
| Logotipo |  |
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1. MMA8451Q  Hay una vista previa y un enlace de descarga de MMA8451Q (archivo pdf) en la parte inferior de esta página. Total 52 Páginas | ||
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Freescale Semiconductor
Data Sheet: Technical Data
An Energy Efficient Solution by Freescale
Document Number: MMA8451Q
Rev. 7.1, 05/2012
3-Axis, 14-bit/8-bit
Digital Accelerometer
MMA8451Q
The MMA8451Q is a smart low-power, three-axis, capacitive micromachined
accelerometer with 14 bits of resolution. This accelerometer is packed with
embedded functions with flexible user programmable options, configurable to two
interrupt pins. Embedded interrupt functions allow for overall power savings
relieving the host processor from continuously polling data. There is access to both
low-pass filtered data as well as high-pass filtered data, which minimizes the data
analysis required for jolt detection and faster transitions. The device can be
configured to generate inertial wakeup interrupt signals from any combination of
the configurable embedded functions allowing the MMA8451Q to monitor events
and remain in a low power mode during periods of inactivity. The MMA8451Q is
available in a 3 mm by 3 mm by 1 mm QFN package.
Top and Bottom View
Features
• 1.95V to 3.6V supply voltage
• 1.6V to 3.6V interface voltage
• ±2g/±4g/±8g dynamically selectable full-scale
• Output Data Rates (ODR) from 1.56 Hz to 800 Hz
• 99 μg/√Hz noise
• 14-bit and 8-bit digital output
• I2C digital output interface (operates to 2.25 MHz with 4.7 kΩ pullup)
• Two programmable interrupt pins for seven interrupt sources
• Three embedded channels of motion detection
• Freefall or Motion Detection: 1 channel
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• Pulse Detection: 1 channel
• Jolt Detection: 1 channel
• Orientation (Portrait/Landscape) detection with programmable hysteresis
• Automatic ODR change for Auto-WAKE and return to SLEEP
• 32-sample FIFO
• High-Pass Filter Data available per sample and through the FIFO
• Self-Test
• RoHS compliant
• Current Consumption: 6 μA – 165 μA
16 PIN QFN
3 mm by 3 mm by 1 mm
CASE 2077-02
Top View
VDDIO 1
BYP 2
NC 3
SCL 4
GND 5
16 15 14
678
13 NC
12 GND
11 INT1
10 GND
9 INT2
Typical Applications
• eCompass applications
• Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/
Pin Connections
Front position identification)
• Notebook, eReader 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)
Part Number
MMA8451QT
MMA8451QR1
ORDERING INFORMATION
Temperature Range
Package Description
-40°C to +85°C
QFN-16
-40°C to +85°C
QFN-16
Shipping
Tray
Tape and Reel
© 2010-2012 Freescale Semiconductor, Inc. All rights reserved.
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Table 1. Pin Description
Pin # Pin Name
Description
1 VDDIO Internal Power Supply (1.62V - 3.6V)
2 BYP Bypass capacitor (0.1 μF)
3 NC Leave open. Do not connect
4
SCL
I2C Serial Clock
5 GND Connect to Ground
6
SDA
I2C Serial Data
7 SA0 I2C Least Significant Bit of the Device I2C Address
8 NC Internally not connected (can be GND or VDD)
9 INT2 Inertial Interrupt 2
10 GND Connect to Ground
11 INT1 Inertial Interrupt 1
12 GND Connect to Ground
13 NC Internally not connected (can be GND or VDD)
14 VDD Power Supply (1.95V - 3.6V)
15 NC Internally not connected (can be GND or VDD)
16 NC Internally not connected (can be GND or VDD)
Pin Status
Input
Input
Open
Open Drain
Input
Open Drain
Input
Input
Output
Input
Output
Input
Input
Input
Input
Input
The device power is supplied through VDD line. Power supply decoupling capacitors (100 nF ceramic plus 4.7 µF bulk, or a
single 4.7 µF ceramic) should be placed as near as possible to the pins 1 and 14 of the device.
The control signals SCL, SDA, and SA0 are not tolerant of voltages more than VDDIO + 0.3V. If VDDIO is removed, the control
signals SCL, SDA, and SA0 will clamp any logic signals with their internal ESD protection diodes.
The functions, the threshold and the timing of the two interrupt pins (INT1 and INT2) are user programmable through the I2C
interface. The SDA and SCL I2C connections are open drain and therefore require a pullup resistor as shown in the application
diagram in Figure 4.
1.1 Soldering Information
The QFN package is compliant with the RoHS standard. Please refer to AN4077.
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Sensors
Freescale Semiconductor, Inc.
MMA8451Q
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
4 Modes of Operation
SLEEP
ACTIVE
OFF
STANDBY
WAKE
Figure 6. MMA8451Q Mode Transition Diagram
Table 7. Mode of Operation Description
Mode
I2C Bus State
VDD
VDDIO
Function Description
OFF
Powered Down
<1.8V VDDIO Can be > VDD
The device is powered off. All analog and digital blocks
are shutdown. I2C bus inhibited.
STANDBY
I2C communication with
MMA8451Q is possible
VDDIO = High
ON VDD = High
ACTIVE bit is cleared
Only digital blocks are enabled.
Analog subsystem is disabled. Internal clocks disabled.
ACTIVE
I2C communication with
(WAKE/SLEEP) MMA8451Q is possible
ON
VDDIO = High
VDD = High
ACTIVE bit is set
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All blocks are enabled (digital, analog).
All register contents are preserved when transitioning from ACTIVE to STANDBY mode. Some registers are reset when
transitioning from STANDBY to ACTIVE. These are all noted in the device memory map register table. The SLEEP and WAKE
modes are ACTIVE modes. For more information on how to use the SLEEP and WAKE modes and how to transition between
these modes please refer to the functionality section of this document.
Sensors
Freescale Semiconductor, Inc.
MMA8451Q
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
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