FXAS21002CQR1 データシートの表示（PDF） - Freescale Semiconductor

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FXAS21002CQR1

3-Axis Digital Angular Rate Gyroscope

Freescale Semiconductor 

Functionality

5.2 Rate Threshold Detection Function

The embedded rate detection function can be used to detect an angular rate event that

exceeds a programmed threshold on any one of the enabled axes for longer than the

programmed debounce time, triggering an interrupt on one of the INT1/INT2 pins (if

enabled).

Sign

ELE

LATCH

RT_Pol

Data

|x|

RT_THS

DBCNTM

RT_COUNT

>

CNT

>

LATCH

RT

ELE

Output data rate (Hz)

800

400

200

100

50

25

12.5

ODR and counter clock period (ms)

1.25

2.5

5

10

20

40

80

Event debounce time range (s)

0 – 0.32

0 – 0.64

0 – 1.28

0 – 2.56

0 – 5.12

0 – 10.24

0 – 20.48

If the debounce counter reaches the value stored in RT_COUNT, the rate threshold

event is detected. The interrupt flag can be either latched or updated in real-time

depending on the state of the ELE bit. The examples illustrated in Figure 20 through

Figure 23 show the use of the rate threshold function with the various settings for the

DBCNTM and ELE control bits:

28

Freescale Semiconductor, Inc.

3-Axis Digital Angular Rate Gyroscope, Rev. 2.1, 5/2015

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