MMA8452QR1【PDF 15/47 页】IC ACCELER 2G/4G/8G 3AXIS 16QFN

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5.9

Interrupt Register Configurations

There are six configurable interrupts in the MMA8452Q: Data Ready, Motion/Freefall, Pulse, Orientation, Transient, and Auto-

SLEEP events. These six 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.

Data Ready

Motion/Freefall

Pulse

INTERRUPT

INT1

CONTROLLER

Orientation

INT2

Transient

Auto-SLEEP

6

INT ENABLE

6

INT CFG

Figure 10. System Interrupt Generation Block Diagram

5.10

Serial

I 2 C

Interface

Acceleration data may be accessed through an I 2 C interface thus making the device particularly suitable for direct interfacing

with a microcontroller. The MMA8452Q features an interrupt signal which indicates when a new set of measured acceleration

data is available thus simplifying data synchronization in the digital system that uses the device. The MMA8452Q may also be

configured to generate other interrupt signals accordingly to the programmable embedded functions of the device for Motion,

Freefall, Transient, Orientation, and Pulse.

The registers embedded inside the MMA8452Q are accessed through the I 2 C serial interface ( Table 9 ). To enable the I 2 C

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

MMA8452Q is in off mode and communications on the I 2 C interface are ignored. The I 2 C interface may be used for

communications between other I 2 C devices and the MMA8452Q does not affect the I 2 C bus.

Table 9. Serial Interface Pin Description

Pin Name

Pin Description

SCL

I

2 C

Serial Clock

I C Serial Data

SDA

SA0

2

I 2 C least significant bit of the device address

There are two signals associated with the I 2 C bus; the Serial Clock Line (SCL) and the Serial Data line (SDA). The latter is a

bidirectional line used for sending and receiving the data to/from the interface. External pullup resistors connected to VDDIO are

expected for SDA and SCL. When the bus is free both the lines are high. The I 2 C interface is compliant with fast mode (400 kHz),

and Normal mode (100 kHz) I 2 C standards ( Table 5 ).

MMA8452Q

Sensors

Freescale Semiconductor, Inc.

15

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