MMA8451Q(2010) 데이터 시트보기 (PDF) - Freescale Semiconductor

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MMA8451Q
(Rev.:2010)

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

Freescale Semiconductor 

Contents

Application Notes for Reference .............................................................................................................................................. 6

1 Block Diagram and Pin Description .................................................................................................................................. 6

1.1 Block Diagram ............................................................................................................................................................. 6

Figure 1. Block Diagram ............................................................................................................................................. 6

1.2 Pin Description ............................................................................................................................................................ 6

Figure 2. Direction of the Detectable Accelerations .................................................................................................... 6

Figure 3. Landscape/Portrait Orientation .................................................................................................................... 7

Figure 4. Application Diagram ..................................................................................................................................... 7

Table 1. Pin Description .............................................................................................................................................. 8

1.3 Soldering Information .................................................................................................................................................. 8

2 Mechanical and Electrical Specifications ......................................................................................................................... 9

2.1 Mechanical Characteristics ......................................................................................................................................... 9

Table 2. Mechanical Characteristics ........................................................................................................................... 9

2.2 Electrical Characteristics ........................................................................................................................................... 10

Table 3. Electrical Characteristics............................................................................................................................. 10

2.3 I2C Interface Characteristic ....................................................................................................................................... 11

Table 4. I2C Slave Timing Values ............................................................................................................................. 11

Figure 5. I2C Slave Timing Diagram ......................................................................................................................... 12

2.4 Absolute Maximum Ratings ...................................................................................................................................... 12

Table 5. Maximum Ratings ....................................................................................................................................... 12

Table 6. ESD and Latch-Up Protection Characteristics ............................................................................................ 12

3 Terminology ...................................................................................................................................................................... 13

3.1 Sensitivity .................................................................................................................................................................. 13

3.2 Zero-g Offset ............................................................................................................................................................. 13

3.3 Self-Test .................................................................................................................................................................... 13

4 Modes of Operation .......................................................................................................................................................... 13

Figure 6. MMA8451Q Mode Transition Diagram ...................................................................................................... 13

Table 7. Mode of Operation Description ................................................................................................................... 13

5 Functionality ...................................................................................................................................................................... 14

5.1 Device Calibration ..................................................................................................................................................... 14

5.2 8-bit or 14-bit Data .................................................................................................................................................... 14

5.3 Internal FIFO Data Buffer .......................................................................................................................................... 14

5.4 Low Power Modes vs. High Resolution Modes ......................................................................................................... 15

5.5 Auto-WAKE/SLEEP Mode ........................................................................................................................................ 15

5.6 Freefall and Motion Detection ................................................................................................................................... 15

5.6.1 Freefall Detection ........................................................................................................................................... 15

5.6.2 Motion Detection ............................................................................................................................................ 15

5.7 Transient Detection ................................................................................................................................................... 16

5.8 Tap Detection ............................................................................................................................................................ 16

5.9 Orientation Detection ................................................................................................................................................ 16

Figure 7. Landscape/Portrait Orientation .................................................................................................................. 16

Figure 8. Illustration of Landscape to Portrait Transition .......................................................................................... 17

Figure 9. Illustration of Portrait to Landscape Transition .......................................................................................... 17

Figure 10. Illustration of Z-Tilt Angle Lockout Transition ........................................................................................... 17

5.10 Interrupt Register Configurations .............................................................................................................................. 18

Figure 11. System Interrupt Generation Block Diagram ........................................................................................... 18

5.11 Serial I2C Interface .................................................................................................................................................... 18

Table 8. Serial Interface Pin Description ................................................................................................................... 18

5.11.1 I2C Operation ................................................................................................................................................. 19

Table 9. I2C Address Selection Table ....................................................................................................................... 19

Single Byte Read ......................................................................................................................................................... 19

Multiple Byte Read ....................................................................................................................................................... 19

Single Byte Write ......................................................................................................................................................... 19

Multiple Byte Write ....................................................................................................................................................... 20

Table 10. I2C Device Address Sequence ................................................................................................................. 20

Figure 12. I2C Timing Diagram ................................................................................................................................. 20

MMA8451Q

2

Sensors

Freescale Semiconductor

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