MMA8652FC datasheet(47/65 Pages) NXP

47 / 65 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.10.3

0x23 – 0x25: PULSE_THSX, Y, Z Pulse Threshold for X, Y and Z registers

The pulse threshold can be set separately for the X, Y, and Z axes. The PULSE_THSX, PULSE_THSY and PULSE_THSZ

registers define the threshold that is used by the system to start the pulse detection procedure.

•

The threshold values range from 1 to 127, with steps of 0.63 g/LSB at a fixed ±8 g acceleration range, thus the minimum

resolution is always fixed at 0.063 g/LSB.

•

The PULSE_THSX, PULSE_THSY and PULSE_THSZ registers define the threshold which is used by the system to start

the pulse detection procedure.

•

The threshold value is expressed over seven bits as an unsigned number.

Table 71. 0x23 PULSE_THSX register (Read/Write)

Back to Register Address Map

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

THSX6

THSX5

THSX4

THSX3

THSX2

THSX1

THSX0

Table 72. PULSE_THSX register

Bit(s)

Field

Description

6–0

THSX[6:0]

Pulse threshold on X-axis

000_0000 (default)

Table 73. 0x24 PULSE_THSY register (Read/Write)

Back to Register Address Map

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

THSY6

THSY5

THSY4

THSY3

THSY2

THSY1

THSY0

Table 74. PULSE_THSY register

Bit(s)

Field

Description

6–0

THSY[6:0]

Pulse threshold on Y-axis

000_0000 (default value)

Table 75. 0x25 PULSE_THSZ register (Read/Write)

Back to Register Address Map

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

THSZ6

THSZ5

THSZ4

THSZ3

THSZ2

THSZ1

THSZ0

Table 76. PULSE_THSZ register

Bit(s)

Field

Description

6–0

THSZ[6:0]

Pulse threshold on Z-axis

000_0000 (default)

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