MMA8652FC datasheet(17/77 Pages) FREESCALE

17 / 77 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

Figure 9. Z-Tilt angle lockout transition

5.10

Interrupt register configurations

There are 7 configurable interrupts in the MMA8652FC: Data Ready, Motion/Freefall, Tap (Pulse), Orientation, Transient, FIFO

events, and Auto-SLEEP events.

Figure 10. System interrupt generation

•

The MMA8652FC features an interrupt signal that indicates when a new set of measured acceleration data is available, thus

simplifying data synchronization in the digital system that uses the device.

•

The MMA8652FC may also be configured to generate other interrupt signals accordingly, to the programmable embedded

functions of the device for Motion, Freefall, Transient, Orientation, and Tap.

5.11

Serial I2C interface

Acceleration data may be accessed through an I2C interface, thus making the device particularly suitable for direct interfacing to

a microcontroller. The acceleration data and configuration registers embedded inside the MMA8652FC are accessed through the

I2C serial interface (Table 10).

•

To enable the I2C interface, VDDIO line must be tied high (i.e., to the interface supply voltage). If VDD is not present and

VDDIO is present, then the MMA8652FC is in OFF mode—and communications on the I2C interface are ignored.

UPRIGHT

NORMAL

Z-LOCK = 29°

0° FLAT

DETECTION

REGION

LOCKOUT

REGION

Figure 9 shows the Z-angle lockout

region.

When lifting the device upright from the

flat position, the device will be active for

orientation detection as low as 14° from 0°

flat. This is user-configurable.

The default angle is 29°, but the angle can

be set as low as 14°.

Interrupt

Controller

Data Ready

Motion/Freefall

Tap (Pulse)

Orientation

Transient

FIFO

Auto-SLEEP

INT ENABLE

INT CFG

INT1

INT2

7 configurable interrupts

These 7 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, then

the corresponding interrupt pin (INT1

or INT2) will assert.

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