MMA8451QR1(2010) 데이터 시트보기 (PDF) - Freescale Semiconductor

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MMA8451QR1
(Rev.:2010)

3-Axis, 14-bit/8-bit Digital Accelerometer

Freescale Semiconductor 

6

Register Descriptions

Table 11. Register Address Map

Name

Auto-Increment Address

Type

Register

Address

FMODE = 0

FMODE > 0

FMODE = 0

FMODE > 0

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

Default

Hex

Value

Comment

STATUS/F_STATUS(1)(2) R

0x00

0x01

00000000 0x00

FMODE = 0, real time status

FMODE > 0, FIFO status

OUT_X_MSB(1)(2)

R

0x01

0x02

0x01

0x03

0x01

Output

[7:0] are 8 MSBs Root pointer to

— of 14-bit sample. XYZ FIFO data.

OUT_X_LSB(1)(2)

R

0x02

0x03

0x00

Output

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

—

sample

OUT_Y_MSB(1)(2)

R

0x03

0x04

0x05

0x00

Output

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

—

sample

OUT_Y_LSB(1)(2)

R

0x04

0x05

0x00

Output

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

—

sample

OUT_Z_MSB(1)(2)

R

0x05

0x06

0x00

Output

[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

R

0x07

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved

R

0x08

—

F_SETUP(1)(3)

R/W 0x09

TRIG_CFG(1)(4)

R/W 0x0A

SYSMOD(1)(2)

R

0x0B

INT_SOURCE(1)(2)

R

0x0C

WHO_AM_I(1)

R

0x0D

XYZ_DATA_CFG(1)(4)

R/W

0x0E

—

—

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

—

—

—

Reserved. Read return 0x00.

00000000 0x00

FIFO set-up

00000000 0x00 Map of FIFO data capture events

00000000 0x00

Current System Mode

00000000 0x00

Interrupt status

00011010 0x1A

Device ID (0x1A)

00000000 0x00

Dynamic Range Settings

HP_FILTER_CUTOFF(1)(4) R/W

0x0F

0x10

Cut-off frequency is set to 16 Hz @

00000000 0x00

800 Hz

PL_STATUS(1)(2)

PL_CFG(1)(4)

R

0x10

R/W 0x11

0x11

0x12

00000000 0x00

10000000 0x80

Landscape/Portrait orientation

status

Landscape/Portrait configuration.

PL_COUNT(1)(3)

PL_BF_ZCOMP(1)(4)

R/W

R/W

0x12

0x13

0x13

0x14

00000000 0x00

Landscape/Portrait debounce

counter

01000100 0x44 Back/Front, Z-Lock Trip threshold

P_L_THS_REG(1)(4)

R/W 0x14

0x15

Portrait to Landscape Trip Angle is

10000100 0x84

29°

FF_MT_CFG(1)(4)

R/W 0x15

0x16

00000000 0x00

Freefall/Motion functional block

configuration

FF_MT_SRC(1)(2)

FF_MT_THS(1)(3)

FF_MT_COUNT(1)(3)

R

R/W

R/W

0x16

0x17

0x18

0x17

0x18

0x19

00000000 0x00

Freefall/Motion event source

register

00000000 0x00 Freefall/Motion threshold register

00000000 0x00 Freefall/Motion debounce counter

Reserved

R

0x19

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved

R

0x1A

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved

R

0x1B

—

—

—

—

—

—

Reserved. Read return 0x00.

Reserved

R

0x1C

—

—

—

—

—

—

Reserved. Read return 0x00.

TRANSIENT_CFG(1)(4) R/W

TRANSIENT_SRC(1)(2)

R

0x1D

0x1E

0x1E

0x1F

00000000 0x00

00000000 0x00

Transient functional block

configuration

Transient event status register

Sensors

Freescale Semiconductor

MMA8451Q

21

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