飞思卡尔半导体公司

技术参数

飞思卡尔能源高效解决方案

MMA8450Q

第2版， 2010年3月

3-Axis,

8-bit/12-bit

数字加速度计

该MMA8450Q是智能低功耗，三轴，电容式微加工

加速度计具有12位分辨率。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，配置为

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。该MMA8450Q的

嵌入式FIFO缓冲器可以被配置到登录到32个样品的X，Y和

Z轴的12位（或8位为更快的下载）数据。 FIFO的实现更

手势和用户可编程的算法，确保了高效的分析没有

数据在共享我损失

2

C总线，并支持系统级节电（最多

的总功率消耗的节省）的通过允许应用程序96％

处理器进入休眠状态的数据将被记录。就有机会获得这两个低通

滤波后的数据，以及高通滤波的数据，该数据的数据最小化

需要颠簸检测和更快的转换分析。该MMA8450Q具有

± 2g的用户可选择的满刻度/ ± 4G / ± 8克。该设备可以被配置为

生成的任意组合惯性唤醒中断信号

可配置嵌入式功能使MMA8450Q监控事件

与在闲置期间保持在低功率模式下。该MMA8450Q

可在一个3× 3 ×1毫米QFN封装。

特点

1.71 V至1.89 V电源电压

± 2G / ± 4G / ± 8克动态可选的满量程

输出数据速率（ ODR）从400 Hz到1.563赫兹

375

微克/ √Hz的

在正常模式下ODR = 400 Hz的噪声

12位数字输出

I

2

C数字输出接口（可在高达400 kHz的快速模式）

可编程2的中断引脚， 8个中断源

内置4通道移动侦测

- 自由落体或运动检测：2通道

- 脉冲检测：1通道

- 瞬态（颠簸）检测： 1通道

方向（纵向/横向）检测带滞后补偿

自动ODR变化自动唤醒，并返回到睡眠

32采样FIFO

自检

万克高抗撞击能力

符合RoHS

MMA8450Q

MMA8450Q ： XYZ三轴

加速度计

±2g/±4g/±8g

顶部和底部视图

16引脚QFN

CASE 2077-01

顶视图

VDD

NC

NC

16

VDD

NC

NC

SCL

GND

15

14

13

GND

GND

INT1

1

2

3

4

5

6

SDA

MMA8450Q

16引脚QFN

3× 3毫米x 1毫米

12

11

10

GND

9

7

SA0

INT2

8

EN

典型应用

引脚连接

静态定位检测（人像/风景模式，上/下，左/右，返回/

前面的位置识别）

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

订购信息

产品型号

MMA8450QT

MMA8450QR1

温度范围

-40°C - +85°C

-40°C - +85°C

封装图

QFN-16

QFN-16

包

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。

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.应用框图.....................................................................................................................................7

表1.引脚说明..............................................................................................................................................7

1.3焊接信息..................................................................................................................................................7

2机械和电气规格.........................................................................................................................8

2.1机械特性.........................................................................................................................................8

表2.机械特性...........................................................................................................................8

2.2电气特性.............................................................................................................................................9

表3.电气特性@ VDD = 1.8 V ， T = 25 ℃，除非另有说明。 ............................................. 9

2.3 I

2

C接口特性.......................................................................................................................................10

表4.我

2

I2C从时序值.............................................................................................................................10

图4.我

2

I2C从时序图..........................................................................................................................11

2.4绝对最大额定值.......................................................................................................................................11

表5.最大额定值........................................................................................................................................11

表6. ESD和闭锁保护特性........................................ .................................................. ..11

3术语.......................................................................................................................................................................12

3.1灵敏度..................................................................................................................................................................12

3.2零重力偏移.............................................................................................................................................................12

3.3自检....................................................................................................................................................................12

4工作模式...........................................................................................................................................................12

图5. MMA8450Q模式转换图.......................................................................................................12

操作说明表7.模式....................................................................................................................12

5功能......................................................................................................................................................................13

5.1设备校准.....................................................................................................................................................13

5.2 8位或12位的数据.....................................................................................................................................................13

5.3内部FIFO数据缓冲..........................................................................................................................................13

5.4低功耗模式.......................................................................................................................................................13

5.5自动唤醒/休眠模式............................................................................................................................................14

5.6自由落体和运动检测...................................................................................................................................14

5.6.1

自由落体检测...........................................................................................................................................14

5.6.2

运动检测............................................................................................................................................14

5.7瞬态检测...................................................................................................................................................14

5.8定位检测.................................................................................................................................................15

图6.插图景观到肖像过渡....................................... .................................................. 15

图7.人像到风景过渡....................................... .................................................. 0.15

图8.插图Z-倾斜角度锁定过渡....................................... .................................................. .... 15

图9.横向/纵向方向..................................................................................................................16

5.9中断寄存器配置..............................................................................................................................16

图10.系统中断产生框图.......................................... .................................................. 16

5.10串行I

2

C接口....................................................................................................................................................17

表8.串行接口引脚说明...................................................................................................................17

5.10.1 I

2

C操作.................................................................................................................................................17

表9.我

2

C类地址选择表.......................................................................................................................17

单字节读.........................................................................................................................................................17

多字节读.......................................................................................................................................................18

单字节写..........................................................................................................................................................18

多字节写.......................................................................................................................................................18

表10.我

2

I2C器件地址序列..................................................................................................................18

图11.我

2

时序图..................................................................................................................................18

MMA8450Q

传感器

飞思卡尔半导体公司

2

6

注册说明.......................................................................................................................................................19

表11.寄存器地址映射...............................................................................................................................19

6.1数据寄存器...........................................................................................................................................................21

为0x00 ， 0x04的0x0B中：状态寄存器.........................................................................................................................21

别名DR_Status （ 0x0B中）或F_Status （为0x10 ） ...................................................................................................21

0X00 ， 0X04 ， 0x0B中状态：数据状态寄存器（只读） .................................... .................................. 21

表12.状态说明.................................................................................................................................21

0×01 ， 0×02 ， ×03 ： OUT_MSB 8位XYZ数据寄存器..................................... .................................................. ...... 22

0×01 OUT_X_MSB ： X_MSB寄存器（只读） ......................................... .................................................. ..22

0X02 OUT_Y_MSB ： Y_MSB寄存器（只读） ......................................... .................................................. ..22

0×03 OUT_Z_MSB ： Z_MSB寄存器（只读） ......................................... .................................................. ..22

0×05 - 0x0A的： OUT_MSB和OUT_LSB 12位XYZ数据寄存器..................................... ...................................... 22

0×05 OUT_X_LSB ： X_LSB寄存器（只读） ......................................... .................................................. .... 22

0×06 OUT_X_MSB ： X_MSB寄存器（只读） ......................................... .................................................. ..22

0×07 OUT_Y_LSB ： Y_LSB寄存器（只读） ......................................... .................................................. .... 22

0x08的OUT_Y_MSB ： Y_MSB寄存器（只读） ......................................... .................................................. ..22

0×09 OUT_Z_LSB ： Z_LSB寄存器（只读） ......................................... .................................................. .... 22

0x0A的OUT_Z_MSB ： Z_MSB寄存器（只读） ......................................... .................................................. ..22

0x0C的 - 0x0E的： OUT_X_DELTA ， OUT_Y_DELTA ， OUT_Z_DELTA交流数据寄存器...................................... .......... 23

0x0C的OUT_X_DELTA ： AC ×8位数据寄存器（只读） .................................... ....................................... 23

0X0D OUT_Y_DELTA ： AC 8位数据寄存器（只读） .................................... ....................................... 23

0x0E的OUT_Z_DELTA ： AC Z 8位数据寄存器（只读） .................................... ........................................ 23

为0x0F ： WHO_AM_I设备ID注册.........................................................................................................................23

为0x0F WHO_AM_I ：设备ID寄存器（只读） ........................................ .................................................. ..23

6.2 32采样FIFO ........................................................................................................................................................23

0×10 ： F_STATUS FIFO状态寄存器......................................................................................................................23

0x10的F_STATUS ： FIFO状态寄存器（只读） ........................................ ............................................. 23

表13. FIFO标志事件说明.....................................................................................................................23

表14. FIFO样本数说明...............................................................................................................24

为0x11 ： F_8DATA 8位FIFO数据.................................................................................................................................24

为0x11 F_8DATA ： 8位FIFO数据寄存器指向寄存器0x01 （只读） ................................. ............... 24

12H处： F_12DATA 12位FIFO数据.............................................................................................................................24

12H处F_12DATA ： 12位FIFO数据寄存器指向寄存器0x05 （只读） ................................. ........... 24

0x13 ： F_SETUP FIFO寄存器设置.........................................................................................................................24

0x13 F_SETUP ： FIFO设置寄存器（读/写） ....................................... .................................................. ..24

0×14 ： SYSMOD系统模式寄存器......................................................................................................................25

0x14的SYSMOD ：系统模式寄存器（只读） ........................................ ................................................. 25

表15. SYSMOD说明................................................................................................................................25

表16. F_SETUP说明...............................................................................................................................25

0x15执行： INT_SOURCE系统中断状态寄存器........................................... .................................................. ..26

0x15执行INT_SOURCE ：系统中断状态寄存器（只读） ....................................... ........................... 26

表17. INT_SOURCE说明........................................................................................................................26

为0x16 ： XYZ_DATA_CFG传感器数据配置寄存器........................................... .......................................... 27

为0x16 XYZ_DATA_CFG ：传感器数据配置寄存器（读/写） ..................................... ................. 27

表18. XYZ_DATA_CFG说明................................................................................................................... 27

0x17符号： HP_FILTER_CUTOFF高通滤波寄存器........................................... .................................................. ..27

0x17已HP_FILTER_CUTOFF ：高通滤波寄存器（读/写） ..................................... ........................... 27

表19. HP_FILTER_CUTOFF设置选项.....................................................................................................27

6.3人像/风景嵌入式功能寄存器........................................... .................................................. ..... 27

为0x18 ： PL_STATUS纵向/横向状态寄存器.......................................... .................................................. ..27

为0x18 PL_STATUS寄存器（只读） ............................................................................................................27

0x19符号： PL_PRE_STATUS纵向/横向上的数据状态寄存器........................................ ..................... 28

0x19符号PL_PRE_STATUS寄存器（只读） ...................................................................................................28

0x1A的： PL_CFG纵向/横向配置寄存器.......................................... ............................................... 28

0x1A的PL_CFG寄存器（读/写） ..................................................................................................................28

表20. PL_CFG注册说明...................................................................................................................28

0x1B ： PL_COUNT纵向横向防抖注册........................................... .............................................. 28

0x1B PL_COUNT寄存器（读/写） ............................................................................................................28

表21. PL_STATUS注册说明............................................................................................................28

与ODR表22. PL_COUNT关系....................................................................................................29

MMA8450Q

传感器

飞思卡尔半导体公司

3

为0x1C ： PL_BF_ZCOMP正面/背面和Z补偿登记........................................ ...................................... 29

为0x1C ： PL_BF_ZCOMP寄存器（读/写） ....................................................................................................29

表23. PL_BF_ZCOMP说明.....................................................................................................................29

表24.前/后方向定义.............................................................................................................29

0x1D - 0x1F的： PL_P_L_THS_REG1 ， 2 ， 3人像到风景阈值寄存器.................................. ............... 29

0x1D PL_P_L_THS_REG1寄存器（读/写） .......................................... .................................................. ..29

表25. PL_P_L_THS_REG1说明..............................................................................................................29

0X1E PL_P_L_THS_REG2寄存器（读/写） .......................................... .................................................. ..29

表26. PL_P_L_THS_REG2说明..............................................................................................................29

0x1F的PL_P_L_THS_REG3寄存器（读/写） .......................................... .................................................. ..29

地址0x20 - 0x22符号PL_L_P_THS_REG1 ， 2 ， 3风景到人像阈值寄存器................................... ................ 30

0x20的PL_L_P_THS_REG1寄存器（读/写） .......................................... .................................................. ..30

表27. PL_L_P_THS_REG1说明..............................................................................................................30

0×21 PL_L_P_THS_REG2寄存器（读/写） .......................................... .................................................. ..30

表28. PL_L_P_THS_REG2说明..............................................................................................................30

0x22符号PL_L_P_THS_REG3寄存器（读/写） .......................................... .................................................. ..30

表29. PL_L_P_THS_REG3说明..............................................................................................................30

表30.横向到纵向行程角度阈值查表................................... ................................. 30

表31. PL_P_L_THS_REG3说明..............................................................................................................30

表32.人像到风景旅行角度阈值查表................................... ................................. 30

6.4自由落体&运动检测寄存器.......................................................................................................................31

0x23 ： FF_MT_CFG_1自由落体运动和配置寄存器1 ......................................... .................................. 31

0x23 FF_MT_CFG_1寄存器（读/写） .......................................................................................................31

表33. FF_MT_CFG_1说明......................................................................................................................31

0X24 FF_MT_SRC_1寄存器（只读） ................................................................................................................32

0X24 ： FF_MT_SRC_自由落体运动和源寄存器（ 0X24 ） ....................................... ............................... 32

表34. FF_MT_SRC_1说明......................................................................................................................32

0x25 ： FF_MT_THS_1自由落体和运动阈值1注册......................................... ....................................... 32

0x25 FF_MT_THS_1寄存器（读/写） .......................................................................................................32

表35. FF_MT_THS_1说明.......................................................................................................................32

图12. DBCNTM位功能..............................................................................................................................33

0X26 ： FF_MT_COUNT_1自由落体运动计数寄存器1 .......................................... .............................................. 33

0X26 FF_MT_COUNT_1寄存器（读/写） .......................................... .................................................. ...... 33

表36. FF_MT_COUNT_1说明.................................................................................................................33

表37. FF_MT_COUNT_1和FF_MT_COUNT_2与ODR关系........................................ .......... 33

0x27 ： FF_MT_CFG_2自由落体运动和配置寄存器2 ......................................... .................................. 34

0x27 FF_MT_CFG_2寄存器（读/写） .......................................................................................................34

0x28 ： FF_MT_SRC_2自由落体运动和Source 2的注册......................................... ............................................ 34

0x28 FF_MT_SRC_2寄存器（只读） ........................................................................................................34

0x29 ： FF_MT_THS_2自由落体和运动阈值2注册......................................... ....................................... 34

0x29 FF_MT_THS_2寄存器（读/写） .......................................................................................................34

0x2A ： FF_MT_COUNT_2自由落体运动和防抖动2注册......................................... ................................. 34

0x2A FF_MT_COUNT_2寄存器（读/写） .......................................... .................................................. ..... 34

6.5瞬态检测寄存器...................................................................................................................................34

0x2B访问： TRANSIENT_CFG瞬态配置寄存器............................................ ............................................ 34

0x2B访问TRANSIENT_ CFG寄存器（读/写） ......................................... .................................................. ...... 34

表38. TRANSIENT_ CFG说明................................................................................................................34

0x2c上： TRANSIENT_SRC瞬变源寄存器............................................ .................................................. .... 34

0x2c上TRANSIENT_SRC寄存器（只读） ........................................... .................................................. ..... 34

0x2D ： TRANSIENT_THS瞬态阈值寄存器............................................ .................................................. 35

0x2D TRANSIENT_THS寄存器（读/写） .......................................... .................................................. ...... 35

表39. TRANSIENT_THS说明..................................................................................................................35

0x2E读取： TRANSIENT_COUNT瞬态防抖注册............................................ ............................................ 35

0x2E之间TRANSIENT_COUNT寄存器（读/写） .......................................... .................................................. 35

表40. TRANSIENT_COUNT说明............................................................................................................35

与ODR表41. TRANSIENT_COUNT关系.......................................... ........................................... 35

表42. TRANSIENT_SRC说明.................................................................................................................35

6.6

敲击检测寄存器...........................................................................................................................................36

值为0x2F ： PULSE_CFG脉冲配置寄存器.......................................................................................................36

值为0x2F PULSE_CFG寄存器（读/写） ..........................................................................................................36

表43. PULSE_CFG说明..........................................................................................................................36

MMA8450Q

传感器

飞思卡尔半导体公司

4

的0x30 ： PULSE_SRC脉冲源注册.................................................................................................................36

的0x30 PULSE_SRC寄存器（只读） ............................................................................................................36

表44. TPULSE_SRC说明........................................................................................................................36

0X31 - 0x33 ： PULSE_THSX ， Y，Z脉冲阈值X，Y & 寄存器................................ .................................. 37

0X31 PULSE_THSX寄存器（读/写） .........................................................................................................37

表45. PULSE_THSX说明........................................................................................................................37

0x32 PULSE_THSY寄存器（读/写） .........................................................................................................37

表46. PULSE_THSY说明........................................................................................................................37

0x33 PULSE_THSZ寄存器（读/写） .........................................................................................................37

表47. PULSE_THSZ说明........................................................................................................................37

0x34 ： PULSE_TMLT脉冲时间窗口1注册.......................................... .................................................. ...... 37

0x34 PULSE_TMLT寄存器（读/写） .........................................................................................................37

表在ODR和电源模式脉冲时间限制48.时间步长.................................... ................................. 37

0x35 ： PULSE_LTCY脉冲延时定时器寄存器....................................................................................................38

0x35 PULSE_LTCY寄存器（读/写） .........................................................................................................38

表49.时间在ODR步脉冲延迟和功耗模式..................................... .................................... 38

0x36数据： PULSE_WIND秒脉冲时间窗口注册.......................................... .............................................. 38

0x36数据PULSE_WIND寄存器（读/写） .........................................................................................................38

表50.时间步长脉冲检测窗口，在ODR和电源模式.................................... ..................... 38

6.7自动休眠寄存器................................................................................................................................................38

0x37符号： ASLP_COUNT自动休眠闲置计时器注册......................................... ................................................ 38

0x37符号ASLP_COUNT寄存器（读/写） ........................................................................................................38

表51. ASLP_COUNT说明.......................................................................................................................38

与ODR表52. ASLP_COUNT关系.....................................................................................................39

0x38 ： CTRL_REG1系统控制寄存器1 ...........................................................................................................39

0x38 CTRL_REG1寄存器（读/写） ...........................................................................................................39

表53. CTRL_REG1说明..........................................................................................................................39

表54.睡眠模式投票率说明.............................................................................................................39

表55.系统输出数据速率选择..........................................................................................................39

表56.满量程的选择...................................................................................................................................40

0x39 ： CTRL_REG2系统控制寄存器2 ...........................................................................................................40

0x39 CTRL_REG2寄存器（读/写） ...........................................................................................................40

表57. CTRL_REG2说明..........................................................................................................................40

0x3A的： CTRL_REG3中断控制寄存器............................................................................................................40

0x3A的CTRL_REG3寄存器（读/写） ..........................................................................................................40

表58. CTRL_REG3说明..........................................................................................................................41

为0x3C ： CTRL_REG5寄存器（读/写） ..................................................................................................................41

CTRL_REG5为0x3C寄存器（读/写） ..........................................................................................................41

表59.中断使能寄存器说明........................................................................................................41

为0x3C ： CTRL_REG5中断配置寄存器............................................ .................................................. .... 42

CTRL_REG5为0x3C寄存器（读/写） ..........................................................................................................42

表60.中断配置寄存器说明........................................... .................................................. 42

6.8用户偏移校正寄存器..............................................................................................................................42

0x3D之间： OFF_X偏移校正X注册.................................................................................................................42

0x3D之间OFF_X寄存器（读/写） ....................................................................................................................42

表61. OFF_X说明....................................................................................................................................42

0x3E的： OFF_Y偏移校正寄存器Y .................................................................................................................42

0x3E的OFF_Y寄存器（读/写） ....................................................................................................................42

表62. OFF_Y说明....................................................................................................................................42

0x3F的： OFF_Z偏移校正寄存器Z ..................................................................................................................42

0x3F的OFF_Z寄存器（读/写） ....................................................................................................................42

表63. OFF_Z说明....................................................................................................................................42

附录A ................................................................................................................................................................................43

表64. MMA8450Q寄存器映射.........................................................................................................................43

表65.加速度计的输出数据.......................................................................................................................45

附录B ................................................................................................................................................................................46

图13.测试分布在插座板前安装的设备（1计数= 3.9毫克） ............................... ..46

图14.配电板后装设备（ 1计数= 3.9毫克） ................................. ........................... 47

图15. 8克Z轴TCS ..........................................................................................................................................50

图16. 8克X轴的TCO （毫克/℃） ............................................................................................................................51

图17. 8克Y轴TCO （毫克/ ° C） ............................................................................................................................52

图18. 8克Z轴的TCO （毫克/℃） ............................................................................................................................53

封装尺寸............................................................................................................................................................... 54

MMA8450Q

传感器

飞思卡尔半导体公司

5