MMA8452Q

Sensors

Freescale Semiconductor, Inc.

35

0x28: PULSE_WIND Register (Read/Write)

The bits WIND7 through WIND0 define the maximum interval of time that can elapse after the end of the latency interval in which

the start of the second pulse event must be detected provided the device has been configured for double pulse detection. The

detected second pulse width must be shorter than the time limit constraints specified by the PULSE_TMLT register, but the end

of the double pulse need not finish within the time specified by the PULSE_WIND register.

The minimum time step for the pulse window is defined in Table 48 and Table 49. The maximum time is the time step at the ODR,

Oversampling mode and LPF Filter Option multiplied by 255.

0x28: PULSE_WIND Second Pulse Time Window Register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

WIND7

WIND6

WIND5

WIND4

WIND3

WIND2

WIND1

WIND0

Table 47. PULSE_WIND Description

WIND[7:0]

Second Pulse Time Window. Default value: 0000_0000.

Table 48. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 1

ODR (Hz)

Max Time Range (s)

Time Step (ms)

Normal

LPLN

HighRes

LP

Normal

LPLN

HighRes

LP

800

0.638

0.638

0.638

0.638

2.5

2.5

2.5

2.5

400

1.276

1.276

1.276

1.276

5

5

5

5

200

2.56

2.56

1.276

2.56

10

10

5

10

100

5.1

5.1

1.276

5.1

20

20

5

20

50

10.2

10.2

1.276

10.2

40

40

5

40

12.5

10.2

40.8

1.276

40.8

40

160

5

160

6.25

10.2

40.8

1.276

81.6

40

160

5

320

1.56

10.2

40.8

1.276

81.6

40

160

5

320

Table 49. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pulse_LPF_EN = 0

ODR (Hz)

Max Time Range (s)

Time Step (ms)

Normal

LPLN

HighRes

LP

Normal

LPLN

HighRes

LP

800

0.318

0.318

0.318

0.318

1.25

1.25

1.25

1.25

400

0.318

0.318

0.318

0.638

1.25

1.25

1.25

2.5

200

0.638

0.638

0.318

1.276

2.5

2.5

1.25

5

100

1.276

1.276

0.318

2.56

5

5

1.25

10

50

2.56

2.56

0.318

5.1

10

10

1.25

20

12.5

2.56

10.2

0.318

20.4

10

40

1.25

80

6.25

2.56

10.2

0.318

20.4

10

40

1.25

80

1.56

2.56

10.2

0.318

20.4

10

40

1.25

80