飞思卡尔半导体公司

技术参数

MMA8451Q

REV 3 ， 09/2010

数字加速度计

该MMA8451Q是智能低功耗，三轴，电容式微加工

加速度计的分辨率为14位。该加速度计是挤满了

与灵活的用户可编程选项嵌入式功能，可配置两个

中断引脚。嵌入式中断功能可以在节省整体功耗

从缓解不断轮询数据的主机处理器。就有机会获得

两个低通滤波的数据，以及高通滤波的数据，这最大限度地减少了

需要颠簸检测和快速转换的数据分析。该设备可以是

配置以产生从任意组合惯性唤醒中断信号

可配置嵌入式功能使MMA8451Q监控事件

与在闲置期间保持在低功率模式下。该MMA8451Q是

采用3毫米x 3毫米×1毫米QFN封装。

特点

1.95 V至3.6 V电源电压

1.6 V至3.6 V接口电压

± 2G / ± 4G / ± 8克动态可选的满量程

输出数据速率（ ODR）从1.56 Hz至800 Hz的

99

微克/ √Hz的

噪音

14位和8位的数字输出

I

2

C数字输出接口（工作于2.25 MHz的4.7 kΩ上拉）

2个可编程中断引脚， 7个中断源

运动检测3嵌入渠道

- 自由落体或运动检测：1通道

- 脉冲检测：1通道

- 颠簸检测：1通道

方向（纵向/横向）检测，具有可编程迟滞

自动ODR变化时自动唤醒，并返回到SLEEP

32采样FIFO

可每个样品，并通过FIFO高通滤波器数据

自-T

美东时间

符合RoHS

消耗电流： 6

μA

– 165

μA

3-Axis,

14-bit/8-bit

飞思卡尔能源高效解决方案

飞思卡尔能源高效解决方案

MMA8451Q

MMA8451Q 3 - AXIS DIGITAL

加速度计

±2g/±4g/±8g

顶部和底部视图

16引脚QFN

3毫米x 3毫米x 1毫米

CASE 2077-01

顶视图

VDD

NC

NC

16

VDDIO

BYP

NC

SCL

15

14

13

12

NC

GND

INT1

1

2

3

4

MMA8451Q

11

典型应用

电子罗盘的应用

GND

5

INT2

9

6

静态定位检测（人像/风景模式，上/下，左/右，返回/

7

8

前面的位置识别）

笔记本电脑，电子阅读器和笔记本电脑翻滚和自由落体检测

引脚连接

实时定位检测（虚拟现实和游戏的3D用户位置

反馈）

实时活动分析（计步器步数，自由落体跌落检测硬盘，航位推算GPS备份）

移动侦测便携式产品省电（自动休眠和自动唤醒的手机， PDA ， GPS ，游戏）

冲击和振动监控（机电一体化补偿，装运和保修使用记录）

用户界面（通过方向改变菜单滚动，点击检测按钮更换）

SDA

10

GND

订购信息

产品型号

MMA8451QT

MMA8451QR1

温度范围

-40 ° C至+ 85°C

-40 ° C至+ 85°C

包装说明

QFN-16

QFN-16

航运

TRAY

磁带和卷轴

本文件包含一个新的产品的特定信息。

规格书中信息如有变更，恕不另行通知。

飞思卡尔半导体公司2010年版权所有。

SA0

NC

目录

对于参考应用笔记.............................................................................................................................................. 6

1框图和引脚说明.................................................................................................................................. 6

1.1框图............................................................................................................................................................. 6

图1.框图............................................................................................................................................. 6

1.2引脚说明............................................................................................................................................................ 6

图2.方向可检测加速度.......................................... .................................................. 6 ........

图3.横向/纵向方向.................................................................................................................... 7

图4.应用框图..................................................................................................................................... 7

表1.引脚说明.............................................................................................................................................. 8

1.3焊接信息.................................................................................................................................................. 8

2机械和电气规格......................................................................................................................... 9

2.1机械特性......................................................................................................................................... 9

表2.机械特性........................................................................................................................... 9

2.2电气特性........................................................................................................................................... 10

表3.电气Characteristics............................................................................................................................. 10

2.3 I

2

C接口特性....................................................................................................................................... 11

表4.我

2

I2C从时序值............................................................................................................................. 11

图5.我

2

I2C从时序图......................................................................................................................... 12

2.4绝对最大额定值...................................................................................................................................... 12

表5.最大额定值....................................................................................................................................... 12

表6. ESD和闭锁保护特性........................................ .................................................. .. 12

3术语...................................................................................................................................................................... 13

3.1灵敏度.................................................................................................................................................................. 13

3.2零重力偏移............................................................................................................................................................. 13

3.3自检.................................................................................................................................................................... 13

4工作模式.......................................................................................................................................................... 13

图6. MMA8451Q模式转换图...................................................................................................... 13

操作说明表7.模式................................................................................................................... 13

5功能...................................................................................................................................................................... 14

5.1设备校准..................................................................................................................................................... 14

5.2 8位或14位的数据.................................................................................................................................................... 14

5.3内部FIFO数据缓冲.......................................................................................................................................... 14

5.4低功耗模式与高分辨率模式......................................................................................................... 15

5.5自动唤醒/休眠模式........................................................................................................................................ 15

5.6自由落体和运动检测................................................................................................................................... 15

5.6.1

自由落体检测........................................................................................................................................... 15

5.6.2

运动检测............................................................................................................................................ 15

5.7瞬态检测................................................................................................................................................... 16

5.8敲击检测............................................................................................................................................................ 16

5.9定位检测................................................................................................................................................ 16

图7.横向/纵向方向.................................................................................................................. 16

图8.插图景观为纵向过渡......................................... ................................................. 17

图9.插图纵向至横向过渡......................................... ................................................. 17

图10.插图Z-倾斜角度锁定过渡....................................... .................................................. .. 17

5.10中断寄存器配置.............................................................................................................................. 18

图11.系统中断产生框图.......................................... ................................................. 18

5.11串行I

2

C接口.................................................................................................................................................... 18

表8.串行接口引脚说明................................................................................................................... 18

5.11.1 I

2

C操作................................................................................................................................................. 19

表9.我

2

C类地址选择表....................................................................................................................... 19

单字节读......................................................................................................................................................... 19

多字节读....................................................................................................................................................... 19

单字节写......................................................................................................................................................... 19

多字节写....................................................................................................................................................... 20

表10.我

2

C设备地址序列................................................................................................................. 20

图12.我

2

时序图................................................................................................................................. 20

MMA8451Q

2

传感器

飞思卡尔半导体公司

6

注册说明.......................................................................................................................................................21

表11.寄存器地址映射...............................................................................................................................21

6.1数据寄存器...........................................................................................................................................................22

F_MODE = 00 ： 0X00状态：数据状态寄存器（只读） .................................... ................................ 22

表12.状态说明.................................................................................................................................23

数据寄存器： 0×01 OUT_X_MSB ， 0X02 OUT_X_LSB ， 0×03 OUT_Y_MSB ， 0X04 OUT_Y_LSB ............................ 24

0×01 OUT_X_MSB ： X_MSB寄存器（只读） ......................................... .................................................. ..24

0X02 OUT_X_LSB ： X_LSB寄存器（只读） ......................................... .................................................. .... 24

0×03 OUT_Y_MSB ： Y_MSB寄存器（只读） ......................................... .................................................. ..24

0×04 OUT_Y_LSB ： Y_LSB寄存器（只读） ......................................... .................................................. .... 24

0×05 OUT_Z_MSB ： Z_MSB寄存器（只读） ......................................... .................................................. ..24

0×06 OUT_Z_LSB ： Z_LSB寄存器（只读） ......................................... .................................................. .... 24

6.2 32采样FIFO ........................................................................................................................................................24

F_MODE > 0 0×00 ： F_STATUS FIFO状态寄存器......................................... .................................................. ..... 24

0×00 F_STATUS ： FIFO状态寄存器（只读） ........................................ ............................................. 24

表13. FIFO标志事件说明.....................................................................................................................25

表14. FIFO样本数说明...............................................................................................................25

0×09 ： F_SETUP FIFO建立注册........................................................................................................................25

0×09 F_SETUP ： FIFO设置寄存器（读/写） ..................................... .................................................. ... 25

表15. F_SETUP说明...............................................................................................................................25

0x0A的： TRIG_CFG .........................................................................................................................................................26

0x0A的： TRIG_CFG触发配置寄存器（读/写） ....................................... ................................... 26

表16.触发配置说明..............................................................................................................26

0x0B中： SYSMOD系统模式寄存器......................................................................................................................26

0x0B中SYSMOD ：系统模式寄存器（只读） ........................................ ................................................. 26

表17. SYSMOD说明................................................................................................................................26

0x0C的： INT_SOURCE系统中断状态寄存器........................................... .................................................. ..27

表18. INT_SOURCE说明........................................................................................................................27

0X0D ： WHO_AM_I设备ID注册.........................................................................................................................28

0X0D ： WHO_AM_I设备ID寄存器（只读） ........................................ .................................................. ..28

0x0E的： XYZ_DATA_CFG注册................................................................................................................................28

0x0E的： XYZ_DATA_CFG （读/写） .................................................................................................................28

表19. XYZ数据配置说明........................................................................................................28

表20.满量程范围.......................................................................................................................................28

为0x0F ： HP_FILTER_CUTOFF高通滤波寄存器........................................... .................................................. 0.28

为0x0F HP_FILTER_CUTOFF ：高通滤波寄存器（读/写） ..................................... .......................... 28

表21.高通滤波器的截止寄存器说明....................................... .................................................. 0.28

表22.高通滤波器的截止选项................................................................................................................29

6.3人像/风景嵌入式功能寄存器........................................... .................................................. ..... 29

0×10 ： PL_STATUS人像/风景状态寄存器.......................................... .................................................. ..29

0x10的PL_STATUS寄存器（只读） ............................................................................................................29

表23. PL_STATUS注册说明............................................................................................................29

0x11的纵向/横向配置寄存器.........................................................................................................30

为0x11 PL_CFG寄存器（读/写...................................................................................................................30

表24. PL_CFG说明.................................................................................................................................30

12H处纵向/横向去抖计数器...............................................................................................................30

×12 PL_COUNT寄存器（读/写） .............................................................................................................30

表25. PL_COUNT说明............................................................................................................................30

与ODR表26. PL_COUNT关系....................................................................................................30

0x13 ： PL_BF_ZCOMP正面/背面和Z补偿登记........................................ ...................................... 30

0x13 ： PL_BF_ZCOMP寄存器（读/写） .....................................................................................................30

表27. PL_BF_ZCOMP说明.....................................................................................................................30

表28. Z-锁定阈值角..........................................................................................................................31

表29.前/后方向定义..............................................................................................................31

0×14 ： P_L_THS_REG人像/风景阈值和迟滞注册........................................ ................... 31

0×14 ： P_L_THS_REG寄存器（读/写） ......................................................................................................31

表30. P_L_THS_REG说明......................................................................................................................31

表31.阈值角度阈值查表........................................ .................................................. ... 31

表32.旅行带角滞后45 °角....................................... .................................................. ........ 31

MMA8451Q

传感器

飞思卡尔半导体公司

3

运动和自由落体嵌入式功能寄存器............................................ .................................................. .... 32

模式1：自由落体检测与ELE = 0， OAE = 0 ...................................................................................................... 32

模式2 ：自由落体检测与ELE = 1 ， OAE = 0 ...................................................................................................... 32

模式3 ：运动检测与ELE = 0 ， OAE = 1 ....................................................................................................... 32

模式四：运动检测与ELE = 1 ， OAE = 1 ....................................................................................................... 32

0x15执行FF_MT_CFG自由落体/运动配置寄存器........................................... ............................................. 33

0x15执行FF_MT_CFG寄存器（读/写） .......................................................................................................... 33

表33. FF_MT_CFG说明......................................................................................................................... 33

图13. FF_MT_CFG高和低重力水平........................................................................................................ 33

为0x16 FF_MT_SRC自由落体/运动源寄存器........................................... .................................................. ...... 33

为0x16 ： FF_MT_SRC自由落体运动和源寄存器（只读） ..................................... ........................ 33

表34.自由落体/运动源描述.......................................................................................................... 34

0x17符号： FF_MT_THS自由落体运动和门限寄存器.......................................... ............................................. 34

0x17已FF_MT_THS寄存器（读/写） ........................................................................................................... 34

表35. FF_MT_THS说明.......................................................................................................................... 34

为0x18 FF_MT_COUNT防抖注册................................................................................................................. 35

为0x18 FF_MT_COUNT_Register （读/写） ........................................... .................................................. ....... 35

表36. FF_MT_COUNT说明..................................................................................................................... 35

与ODR表37. FF_MT_COUNT关系.......................................... .................................................. 35

图14. DBCNTM位功能............................................................................................................................. 36

6.5瞬态（ HPF ）加速度检测................................................................................................................... 37

0x1D ： Transient_CFG注册................................................................................................................................... 37

0x1D TRANSIENT_ CFG寄存器（读/写） ......................................... .................................................. ..... 37

表38. TRANSIENT_ CFG说明................................................................................................................ 37

0X1E TRANSIENT_SRC注册............................................................................................................................... 37

0X1E TRANSIENT_SRC寄存器（只读） ........................................... .................................................. ..... 37

表39. TRANSIENT_SRC说明................................................................................................................. 37

0x1F的TRANSIENT_THS注册................................................................................................................................ 38

0x1F的TRANSIENT_THS寄存器（读/写） .......................................... .................................................. ...... 38

表40. TRANSIENT_THS说明................................................................................................................. 38

0x20的TRANSIENT_COUNT ......................................................................................................................................... 38

0x20的TRANSIENT_COUNT寄存器（读/写） .......................................... .................................................. 38

表41. TRANSIENT_COUNT说明............................................................................................................ 38

与ODR表42. TRANSIENT_COUNT关系.......................................... .......................................... 38

6.6单人，双人和定向敲击检测寄存器......................................... ................................................. 39

0×21 ： PULSE_CFG脉冲配置寄存器....................................................................................................... 39

0×21 PULSE_CFG寄存器（读/写） .......................................................................................................... 39

表43. PULSE_CFG说明.......................................................................................................................... 39

0x22符号： PULSE_SRC脉冲源注册................................................................................................................. 39

0x22符号PULSE_SRC寄存器（只读） ........................................................................................................... 39

表44. PULSE_SRC说明.......................................................................................................................... 39

0x23 - 0x25 ： PULSE_THSX ， Y，Z脉冲阈值X，Y & 寄存器................................ ................................. 40

0x23 PULSE_THSX寄存器（读/写） ........................................................................................................ 40

表45. PULSE_THSX说明........................................................................................................................ 40

0X24 PULSE_THSY寄存器（读/写） ........................................................................................................ 40

表46. PULSE_THSY说明........................................................................................................................ 40

0x25 PULSE_THSZ寄存器（读/写） ........................................................................................................ 40

表47. PULSE_THSZ说明........................................................................................................................ 40

0X26 ： PULSE_TMLT脉冲时间窗口1注册.......................................... .................................................. ...... 40

0X26 PULSE_TMLT寄存器（读/写） ........................................................................................................ 40

表48. PULSE_TMLT说明........................................................................................................................ 40

表脉冲时间限制49.时间步长（注册为0x0F ） Pulse_ LPF_EN = 1 ................................. ......................... 40

表脉冲时间限制（注册为0x0F ） Pulse_LPF_EN = 0 50.时间步长.................................. ......................... 41

0x27 ： PULSE_LTCY脉冲延时定时器寄存器........................................... .................................................. ....... 41

0x27 PULSE_LTCY寄存器（读/写） ......................................................................................................... 41

表51. PULSE_LTCY说明........................................................................................................................ 41

表脉冲延迟@ ODR和电源模式（注册为0x0F ） Pulse_ LPF_EN = 1 .................... 41 52.时间步长

表脉冲延迟@ ODR和电源模式（注册为0x0F ） Pulse_ LPF_EN = 0 .................... 41 53.时间步长

0x28 PULSE_WIND寄存器（读/写） ................................................................................................................. 42

表54. PULSE_WIND说明........................................................................................................................ 42

表脉冲检测窗口@ ODR和电源模式（注册为0x0F ） Pulse_ LPF_EN = 1 55.时间步长.... 42

表脉冲检测窗口@ ODR和电源模式（注册为0x0F ） Pulse_ LPF_EN = 0 ..... 42 56.时间步长

MMA8451Q

4

传感器

飞思卡尔半导体公司

6.4

自动唤醒/休眠检测..................................................................................................................................43

0x29 ASLP_COUNT寄存器（读/写） ........................................................................................................43

表57. ASLP_COUNT说明.......................................................................................................................43

与ODR表58. ASLP_COUNT关系.....................................................................................................43

表59.休眠/唤醒模式盖茨和触发器........................................ .................................................. ....... 43

6.8控制寄存器.......................................................................................................................................................44

0x2A ： CTRL_REG1系统控制寄存器1 ...........................................................................................................44

0x2A CTRL_REG1寄存器（读/写） ..........................................................................................................44

表60. CTRL_REG1说明..........................................................................................................................44

表61.休眠模式费用说明.................................................................................................................44

表62.系统输出数据速率选择..........................................................................................................44

表63.满量程的选择...................................................................................................................................44

0x2B访问： CTRL_REG2系统控制寄存器2 ...........................................................................................................45

0x2B访问CTRL_REG2寄存器（读/写） ..........................................................................................................45

表64. CTRL_REG2说明..........................................................................................................................45

表65. MODS过采样模式.....................................................................................................................45

表66. MODS过采样模式电流消耗和平均值在每一个ODR ....................... 45

0x2c上： CTRL_REG3中断控制寄存器............................................................................................................46

0x2c上CTRL_REG3寄存器（读/写） ..........................................................................................................46

表67. CTRL_REG3说明..........................................................................................................................46

0x2D ： CTRL_REG4寄存器（读/写） ..................................................................................................................46

0x2D CTRL_REG4寄存器（读/写） ..........................................................................................................46

表68.中断使能寄存器说明.......................................................................................................46

0x2E之间CTRL_REG5寄存器（读/写） ...................................................................................................................47

0x2E读取： CTRL_REG5中断配置寄存器............................................ .............................................. 47

表69.中断配置寄存器说明........................................... .................................................. 47

6.9用户偏移校正寄存器..............................................................................................................................47

值为0x2F ： OFF_X偏移校正X注册..................................................................................................................47

值为0x2F OFF_X寄存器（读/写） ....................................................................................................................47

表70. OFF_X说明....................................................................................................................................47

的0x30 ： OFF_Y偏移校正寄存器Y ..................................................................................................................47

的0x30 OFF_Y寄存器（读/写） ....................................................................................................................47

表71. OFF_Y说明....................................................................................................................................47

0X31 ： OFF_Z偏移校正寄存器Z ..................................................................................................................47

0X31 OFF_Z寄存器（读/写） .....................................................................................................................47

表72. OFF_Z说明....................................................................................................................................47

表73. MMA8451Q寄存器映射.........................................................................................................................48

表74.加速度计的输出数据.......................................................................................................................49

包Dimensions................................................................................................................................................................50

6.7

MMA8451Q

传感器

飞思卡尔半导体公司

5