MMA7456LR1 Freescale, MMA7456LR1 Datasheet - Page 2

• Manufacturer Part Number: MMA7456LR1
• Manufacturer: Freescale

Specifications of MMA7456LR1

• Package Type: LGA
• Operating Supply Voltage (min): 2.4V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 3mm
• Product Height (mm): 1mm
• Product Length (mm): 5mm
• Mounting: Surface Mount
• Pin Count: 14
• Lead Free Status / RoHS Status: Compliant

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 ...................................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
MMA7456L
2