MMA8652FC datasheet(16/65 Pages) NXP

16 / 65 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

The Transient Detection function can be routed to either interrupt pin through bit 5 in CTRL_REG5 register (0x2E). Registers

0x1D – 0x20 are the dedicated Transient Detection configuration registers. The source register contains directional data to

determine the direction of the acceleration (either positive or negative).

5.8

Tap detection

The MMA8652FC has embedded single/double and directional tap detection.

•

The tap detection function has various customizing timers, for setting the pulse time width and the latency time between

pulses. There are programmable thresholds for all three axes.

•

The tap detection can be configured to run through the high-pass filter and also through a low-pass filter, which provides

more customizing and tunable tap detection schemes.

•

The status register provides updates on the axes where the event was detected and the direction of the tap.

5.9

Orientation detection

The MMA8652FC incorporates an advanced orientation detection algorithm with the ability to detect all six orientations shown in

Figure 6. The embedded algorithm uses configurable trip points, allowing the selection of the desired midpoint and hysteresis

value (see Figure 7).

Figure 6. Sensitive axes orientation

Top View

PORTRAIT UP

Earth Gravity

Pin 1

Xout @ 0 g

Yout @ –1 g

Zout @ 0 g

Xout @ 1 g

Yout @ 0 g

Zout @ 0 g

Xout @ 0 g

Yout @ 1 g

Zout @ 0 g

Xout @ –1 g

Yout @ 0 g

Zout @ 0 g

LANDSCAPE LEFT

PORTRAIT DOWN

LANDSCAPE RIGHT

Side View

FRONT

Xout @ 0 g

Yout @ 0 g

Zout @ 1 g

BACK

Xout @ 0 g

Yout @ 0 g

Zout @ –1 g

Pin 1

(Top View)

Direction of the

Detectable Accelerations

MMA8652FC Datasheet(PDF) 16 Page - NXP Semiconductors

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