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digital accelerometer. MMA8451Q Datasheet

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digital accelerometer. MMA8451Q Datasheet






MMA8451Q accelerometer. Datasheet pdf. Equivalent




MMA8451Q accelerometer. Datasheet pdf. Equivalent





Part

MMA8451Q

Description

14-bit/8-bit digital accelerometer



Feature


NXP Semiconductors Data sheet: Technical data Document Number: MMA8451Q Rev. 1 0.3, 02/2017 MMA8451Q, 3-axis, 14-bit/ 8-bit digital accelerometer MMA8451Q The MMA8451Q is a smart, low-power, thr ee-axis, capacitive, micromachined acce lerometer with 14 bits of resolution. T his accelerometer is packed with embedd ed functions with flexible user program mable options, con.
Manufacture

NXP

Datasheet
Download MMA8451Q Datasheet


NXP MMA8451Q

MMA8451Q; figurable to two interrupt pins. Embedde d interrupt functions allow for overall power savings relieving the host proce ssor from continuously polling data. Th ere is access to both low-pass filtered data as well as high-pass filtered dat a, which minimizes the data analysis re quired for jolt detection and faster tr ansitions. The device can be configured to generate inert.


NXP MMA8451Q

ial wakeup interrupt signals from any co mbination of the configurable embedded functions allowing the MMA8451Q to moni tor events and remain in a low-power mo de during periods of inactivity. The MM A8451Q is available in a 16-pin QFN, 3 mm x 3 mm x 1 mm package. Top and bott om view Features • 1.95 V to 3.6 V s upply voltage • 1.6 V to 3.6 V interf ace voltage • ±2 g/±4 .


NXP MMA8451Q

g/±8 g dynamically selectable full scal e • Output data rates (ODR) from 1.56 Hz to 800 Hz • 99 μg/√Hz noise 14-bit and 8-bit digital output • I 2C digital output interface • Two pro grammable interrupt pins for seven inte rrupt sources • Three embedded channe ls of motion detection — Freefall or motion detection: one channel — Pulse detection: one channel — Jolt detecti.

Part

MMA8451Q

Description

14-bit/8-bit digital accelerometer



Feature


NXP Semiconductors Data sheet: Technical data Document Number: MMA8451Q Rev. 1 0.3, 02/2017 MMA8451Q, 3-axis, 14-bit/ 8-bit digital accelerometer MMA8451Q The MMA8451Q is a smart, low-power, thr ee-axis, capacitive, micromachined acce lerometer with 14 bits of resolution. T his accelerometer is packed with embedd ed functions with flexible user program mable options, con.
Manufacture

NXP

Datasheet
Download MMA8451Q Datasheet




 MMA8451Q
NXP Semiconductors
Data sheet: Technical data
Document Number: MMA8451Q
Rev. 10.3, 02/2017
MMA8451Q, 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 16-pin QFN, 3 mm x 3 mm x 1 mm package.
Top and bottom view
Features
• 1.95 V to 3.6 V supply voltage
• 1.6 V to 3.6 V interface voltage
• ±2 g/±4 g/±8 g 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
• Two programmable interrupt pins for seven interrupt sources
• Three embedded channels of motion detection
— Freefall or motion detection: one channel
— Pulse detection: one channel
— Jolt detection: one 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
• Current consumption: 6 μA to 165 μA
16-pin QFN
3 mm x 3 mm x 1 mm
Top view
VDDIO 1
BYP 2
DNC 3
SCL 4
GND 5
16 15 14
678
13 NC
12 GND
11 INT1
10 GND
9 INT2
Typical Applications
• E-compass applications
Pin connections
• 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)
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
© NXP Semiconductors N.V. 2017




 MMA8451Q
Contents
Block Diagram and Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Mechanical and Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 I2C interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Zero-g offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Self-test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 System Modes (SYSMOD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Device calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 8-bit or 14-bit data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Internal FIFO data buffer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4 Low-power modes vs. high-resolution modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5 Auto-wake/sleep mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.6 Freefall and motion detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.7 Transient detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8 Tap detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.9 Orientation detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.10 Interrupt register configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.11 Serial I2C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Register Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 32-sample FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.3 Portrait/landscape embedded function registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.4 Motion and freefall embedded function registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.5 Transient (HPF) acceleration detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.6 Single, double and directional tap detection registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.7 Auto-wake/sleep detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.8 Control registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.9 User offset correction registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7 Printed Circuit Board Layout and Device Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.1 Printed circuit board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.2 Overview of soldering considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.3 Halogen content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8 Package Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.1 Tape and reel information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.2 Package description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Related documentation
The MMA8451Q device features and operations are described in a variety of reference manuals, user guides, and application
notes. To find the most-current versions of these documents:
1. Go to the MMA8453Q web page at http://www.nxp.com/products/:MMA8451Q.
2. Click the Documentation tab.
MMA8451Q
2
Sensors
NXP Semiconductors N.V.




 MMA8451Q
1 Block Diagram and Pin Description
VDD
VDDIO
VSS
X-axis
Transducer
Y-axis
Transducer
Z-axis
Transducer
Internal
OSC
C to V
Converter
Clock
GEN
14-bit
ADC
INT1
INT2
Embedded
DSP
Functions
I2C
SDA
SCL
32 Data Point
Configurable
FIFO Buffer
with Watermark
Freefall
and Motion
Detection
Transient
Detection
(i.e., fast motion,
jolt)
Enhanced
Orientation with
Hysteresis
and Z-lockout
Shake Detection
through
Motion
Threshold
Single, Double,
and Directional
Tap Detection
Auto-wake/Auto-sleep configurable with debounce counter and multiple motion interrupts for control
MODE Options
Low Power
Low Noise + Low Power
High Resolution
Normal
Active Mode
wake
Auto-wake/sleep
Active Mode
sleep
MODE Options
Low Power
Low Noise + Low Power
High Resolution
Normal
Figure 1. Block diagram
Z
X1
Earth Gravity
13
1
Y 95
(TOP VIEW)
DIRECTION OF THE
DETECTABLE ACCELERATIONS
(BOTTOM VIEW)
Figure 2. Direction of the detectable accelerations
Sensors
NXP Semiconductors N.V.
MMA8451Q
3



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