MMA8450QT datasheet(16/57 Pages) FREESCALE

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Sensors

Freescale Semiconductor

MMA8450Q

Figure 9 shows the device configuration in the 6 different orientation modes. These orientations are defined as the following:

PU = Portrait UP, LR = Landscape Right, PD = Portrait Down, LL = Landscape Left, Back and Front.

Figure 9. Landscape/Portrait Orientation

There are several registers to configure the orientation detection and are described in detail in the register setting section.

5.9

Interrupt Register Configurations

There are eight configurable interrupts in the MMA8450Q. These are Auto-Sleep, Data Ready, Motion/Freefall 1, Motion/

Freefall 2, Transient, Orientation Detection, Tap Detection and the FIFO events. These eight interrupt sources can be routed to

one of two interrupt pins. The interrupt source must be enabled and configured. If the event flag is asserted because the event

condition is detected, the corresponding interrupt pin, INT1 or INT2, will assert.

Figure 10. System Interrupt Generation Block Diagram

Top View

Earth Gravity

Pin 1

Xout @ 0g

Yout @ -1g

Zout @ 0g

Xout @ 1g

Yout @ 0g

Zout @ 0g

Xout @ 0g

Yout @ 1g

Zout @ 0g

Xout @ -1g

Yout @ 0g

Zout @ 0g

Side View

FRONT

Xout @ 0g

Yout @ 0g

Zout @ 1g

BACK

Xout @ 0g

Yout @ 0g

Zout @ -1g

Auto-Sleep

FIFO

Transient Detect

Orientation Detect

Pulse Detect

Freefall/Motion

Data Ready

Func_En

INTERRUPT

CONTROLLER

INT_ENABLE

INT1

INT2

Event Flag 0

Event Flag 1

Event Flag 2

Event Flag 3

Event Flag 4

Event Flag 5

Event Flag 7

INT_CFG

Event Flag 6

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