MMA8451QT【PDF 19/52 页】IC ACCELEROMETER 3AXIS 16QFN

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6

Register Descriptions

Table 12. Register Address Map

Auto-Increment Address

Name

Type

Register

Address FMODE = 0 FMODE > 0 FMODE = 0 FMODE > 0

Default

Hex

Value

Comment

F_READ = 0 F_READ = 0 F_READ = 1 F_READ = 1

STATUS/F_STATUS (1)(2)

R

0x00

0x01

00000000

0x00

FMODE = 0, real time status

FMODE > 0, FIFO status

OUT_X_MSB (1)(2)

OUT_X_LSB (1)(2)

OUT_Y_MSB (1)(2)

OUT_Y_LSB (1)(2)

OUT_Z_MSB (1)(2)

R

R

R

R

R

0x01

0x02

0x03

0x04

0x05

0x02

0x03

0x04

0x05

0x06

0x01

0x03

0x05

0x00

0x00

0x00

0x01

0x00

Output

Output

Output

Output

Output

—

—

—

—

—

[7:0] are 8 MSBs Root pointer to

of 14-bit sample. XYZ FIFO data.

[7:2] are 6 LSBs of 14-bit real-time

sample

[7:0] are 8 MSBs of 14-bit real-time

sample

[7:2] are 6 LSBs of 14-bit real-time

sample

[7:0] are 8 MSBs of 14-bit real-time

sample

OUT_Z_LSB (1)(2)

R

0x06

0x00

Output

—

[7:2] are 6 LSBs of 14-bit real-time

sample

Reserved

Reserved

R

R

0x07

0x08

—

—

—

—

—

—

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved. Read return 0x00.

F_SETUP (1)(3)

TRIG_CFG (1)(4)

SYSMOD (1)(2)

INT_SOURCE (1)(2)

WHO_AM_I (1)

XYZ_DATA_CFG (1)(4)

HP_FILTER_CUTOFF (1)(4)

PL_STATUS (1)(2)

PL_CFG (1)(4)

PL_COUNT (1)(3)

PL_BF_ZCOMP (1)(4)

P_L_THS_REG (1)(4)

FF_MT_CFG (1)(4)

FF_MT_SRC (1)(2)

FF_MT_THS (1)(3)

FF_MT_COUNT (1)(3)

R/W

R/W

R

R

R

R/W

R/W

R

R/W

R/W

R/W

R/W

R/W

R

R/W

R/W

0x09

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

0x10

0x11

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x19

00000000

00000000

00000000

00000000

00011010

00000000

00000000

00000000

10000000

00000000

01000100

10000100

00000000

00000000

00000000

00000000

0x00

0x00

0x00

0x00

0x1A

0x00

0x00

0x00

0x80

0x00

0x44

0x84

0x00

0x00

0x00

0x00

FIFO setup

Map of FIFO data capture events

Current System Mode

Interrupt status

Device ID (0x1A)

Dynamic Range Settings

Cutoff frequency is set to 16 Hz @

800 Hz

Landscape/Portrait orientation

status

Landscape/Portrait configuration.

Landscape/Portrait debounce

counter

Back/Front, Z-Lock Trip threshold

Portrait to Landscape Trip Angle is

29°

Freefall/Motion functional block

configuration

Freefall/Motion event source

register

Freefall/Motion threshold register

Freefall/Motion debounce counter

Reserved

Reserved

Reserved

Reserved

R

R

R

R

0x19

0x1A

0x1B

0x1C

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved. Read return 0x00.

Reserved. Read return 0x00.

Reserved. Read return 0x00.

TRANSIENT_CFG (1)(4)

TRANSIENT_SCR (1)(2)

R/W

R

0x1D

0x1E

0x1E

0x1F

00000000

00000000

0x00

0x00

Transient functional block

configuration

Transient event status register

MMA8451Q

Sensors

Freescale Semiconductor, Inc.

19

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