MMA7455LR1 Freescale Semiconductor, MMA7455LR1 Datasheet - Page 2
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MMA7455LR1
Manufacturer Part Number
MMA7455LR1
Description
Board Mount Accelerometers 3-AXIS DIGITAL 2 4 8G
Manufacturer
Freescale Semiconductor
Datasheet
1.MMA7455LT.pdf
(35 pages)
Specifications of MMA7455LR1
Sensing Axis
X, Y, Z
Acceleration
2 g, 4 g, 8 g
Digital Output - Number Of Bits
8 bit, 10 bit
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.4 V
Supply Current
400 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Sensitivity
64 LSB/g
Package / Case
LGA-14
Output Type
Digital
Acceleration Range
± 2g, ± 4g, ± 8g
No. Of Axes
3
Ic Interface Type
I2C, SPI
Sensor Case Style
LGA
No. Of Pins
14
Supply Voltage Range
2.4V To 3.6V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MMA7455LR1
Manufacturer:
ON
Quantity:
12 000
Company:
Part Number:
MMA7455LR1
Manufacturer:
FSL
Quantity:
3 000
Part Number:
MMA7455LR1
Manufacturer:
FREESCALE
Quantity:
20 000
Contents
ELECTRO STATIC DISCHARGE (ESD) ......................................................................................................................................6
PRINCIPLE OF OPERATION ......................................................................................................................................................8
FEATURES ..................................................................................................................................................................................9
LEVEL DETECTION ...................................................................................................................................................................10
THRESHOLD DETECTION FOR MOTION AND FREEFALL CONDITIONS ............................................................................11
PULSE DETECTION ..................................................................................................................................................................12
ASSIGNING, CLEARING & DETECTING INTERRUPTS ..........................................................................................................15
DIGITAL INTERFACE ................................................................................................................................................................16
BASIC CONNECTIONS .............................................................................................................................................................19
REGISTER DEFINITIONS .........................................................................................................................................................21
SOLDERING AND MOUNTING GUIDELINES FOR THE LGA ACCELEROMETER SENSOR TO A PC BOARD ...................29
Sensors
Freescale Semiconductor
Self-Test .........................................................................................................................................................................9
g-Select ..........................................................................................................................................................................9
Standby Mode ................................................................................................................................................................9
Measurement Mode .......................................................................................................................................................9
$18: Control 1 (Read/Write) Setting the Detection Axes for X, Y and Z .......................................................................10
$19: Control 2 (Read/Write) Motion Detection (OR Condition) or Freefall Detection (AND Condition) ........................10
$18: Control 1 (Read/Write): Setting the threshold to be an integer value or an absolute value .................................10
$1A: Level Detection Threshold Limit Value (Read/Write) ...........................................................................................10
CASE 1: Motion Detection ...........................................................................................................................................11
CASE 2: Motion Detection ...........................................................................................................................................11
CASE 3: Freefall Detection ..........................................................................................................................................11
CASE 4: Freefall Detection ..........................................................................................................................................11
$18: Control 1 (Read/Write): Disable X, Y or Z for Pulse Detection .............................................................................12
$19: Control 2 (Read/Write): Motion Detection (OR condition) or Freefall Detection (AND condition) ........................12
CASE 1: Single Pulse Motion Detection: X or Y or Z > Pulse Threshold for Time < Pulse Duration ..........................12
CASE 2: Freefall Detection: X and Y and Z < Pulse Threshold for Time > Latency Time ...........................................13
CASE 3: Double Pulse Detection: X OR Y OR Z > Threshold for Pulse Duration1 < PDTime1, Latency Time, .........14
Clearing the Interrupt Pins: Register $17 .....................................................................................................................15
Detecting Interrupts ......................................................................................................................................................16
I
SPI Slave Interface ......................................................................................................................................................18
Pin Descriptions ...........................................................................................................................................................19
Recommended PCB Layout for Interfacing Accelerometer to Microcontroller .............................................................19
2
C Slave Interface .......................................................................................................................................................16
MMA7455L
2