MMA8452Q
Rev 3, 10/2010
Freescale Semiconductor
Technical Data
An Energy Efficient Solution by Freescale This document contains certain information on a new product.the same to you什么意思
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2010. All rights rerved.3-Axis, 12-bit/8-bit
Digital Accelerometer
The MMA8452Q is a smart low-power, three-axis, capacitive micromachined
accelerometer with 12 bits of resolution. This accelerometer is packed with
embedded functions with flexible ur programmable options, configurable to two
interrupt pins. Embedded interrupt functions allow for overall power savings
relieving the host processor from continuously polling data.
The MMA8452Q has ur lectable full scales of ±2g/±4g/±8g with high passdominated
filtered data as well as non filtered data available real-time. The device can be
configured to generate inertial wake-up interrupt signals from any combination of
the configurable embedded functions allowing the MMA8452Q to monitor events
and remain in a low power mode during periods of inactivity . The MMA8452Q is
available in a 3 mm x 3 mm x 1 mm QFN package.
Features
•
1.95 V to 3.6 V supply voltage •
1.6 V to 3.6 V interface voltage •
±2g/±4g/±8g dynamically lectable full-scale •
Output Data Rates (ODR) from 1.56 Hz to 800 Hz •
99 μg/√Hz noi •
12-bit and 8-bit digital output •
I 2C digital output interface (operates to 2.25 MHz with 4.7 k Ω pull-up)•
2 programmable interrupt pins for 6 interrupt sources •
3 embedded channels of motion detection
– Freefall or Motion Detection: 1 channel
– Pul Detection: 1 channel
– Jolt Detection: 1 channel
•Orientation (Portrait/Landscape) detection with t hysteresis
•Automatic ODR change for Auto-WAKE and return to SLEEP
•High Pass Filter Data available real-time
•Self-T est
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•RoHS compliant
•Current Consumption: 6 μA – 165 μA Typical Applications •E-Compass applications
•Static orientation detection (Portrait/Landscape, Up/Down, Left/Right, Back/Front position identification)
•Notebook, E-Reader and Laptop Tumble and Freefall Detection
•Real-time orientation detection (virtual reality and gaming 3D ur position
feedback)
•Real-time activity analysis (pedometer step counting, freefall drop detection
for HDD, dead-reckoning GPS backup)
•Motion detection for portable product power saving (Auto-SLEEP and Auto-WAKE for cell phone, PDA, GPS, gaming)•Shock and vibration monitoring (mechatronic compensation, shipping and warranty usage logging)
•Ur interface (menu scrolling by orientation change, tap detection for button replacement)ORDERING INFORMATION
Part Number
Temperature Range Package Description Shipping MMA8452QT
-40°C to +85°C QFN-16Tray MMA8452QR1-40°C to +85°C QFN-16Tape and Reel
16 PIN QFN 3 mm x 3 mm x 1 mm CASE 2077-01MMA8452Q MMA8452Q: 3-AXIS DIGITAL ACCELEROMETER ±2g/±4g/±8g Top and Bottom View
Contents
Application Notes for Reference (6)
1Block Diagram and Pin Description (6)
1.1Block Diagram (6)
Figure1. Block Diagram (6)
1.2Pin Description (6)
Figure2. Direction of the Detectable Accelerations (6)
Figure3. Landscape/Portrait Orientation (7)
Figure4. Application Diagram (7)
Table1. Pin Description (8)
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1.3Soldering Information (8)
2Mechanical and Electrical Specifications (9)
2.1Mechanical Characteristics (9)
Table2. Mechanical Characteristics @ VDD = 1.8 V, T = 25°C unless otherwi noted. (9)
2.2Electrical Characteristics (10)
Table3. Electrical Characteristics @ VDD = 2.5 V, VDDIO = 1.8 V, T = 25°C unless otherwi noted. (10)
2.3I2C Interface Characteristic (11)
Table4. I2C Slave Timing Values (11)
Figure5. I2C Slave Timing Diagram (12)
2.4Absolute Maximum Ratings (12)
Table5. Maximum Ratings (12)
Table6. ESD and Latch-Up Protection Characteristics (12)
3Terminology (13)
3.1Sensitivity (13)
3.2Zero-g Offt (13)
3.3Self-Test (13)
4Modes of Operation (13)
Figure6. MMA8452Q Mode Transition Diagram (13)
Table7. Mode of Operation Description (13)
5Functionality (14)
5.1Device Calibration (14)
5.28-bit or 12-bit Data (14)
5.3Low Power Modes vs. High Resolution Modes (15)
5.4Auto-WAKE/SLEEP Mode (15)
5.5Freefall and Motion Detection (15)
5.5.1Freefall Detection (15)
5.5.2Motion Detection (15)
5.6Transient Detection (16)
5.7Tap Detection (16)
5.8Orientation Detection (16)
Figure7. Landscape/Portrait Orientation (16)
Figure8. Illustration of Landscape to Portrait Transition (17)
Figure9. Illustration of Portrait to Landscape Transition (17)
Figure10. Illustration of Z-Tilt Angle Lockout Transition (17)
5.9Interrupt Register Configurations (18)
Figure11. System Interrupt Generation Block Diagram (18)
5.10Serial I2C Interface (18)
Table8. Serial Interface Pin Description (18)
5.10.1I2C Operation (19)
Table9. I2C Address Selection Table (19)
Single Byte Read (19)
Multiple Byte Read (19)
Single Byte Write (19)
Multiple Byte Write (20)
Table10. I2C Device Address Sequence (20)
Figure12. I2C Timing Diagram (20)
MMA8452Q
Sensors
6Register Descriptions (21)
Table11. Register Address Map (21)
6.1Data Registers (22)
0X00 STATUS: Data Status Register (Read Only) (22)
Table12. STATUS Description (23)
Data Registers: 0x01 OUT_X_MSB, 0x02 OUT_X_LSB, 0x03 OUT_Y_MSB, 0X04 OUT_Y_LSB (24)
0x01 OUT_X_MSB: X_MSB Register (Read Only) (24)
0x02 OUT_X_LSB: X_LSB Register (Read Only) (24)
0x03 OUT_Y_MSB: Y_MSB Register (Read Only) (24)
0x04 OUT_Y_LSB: Y_LSB Register (Read Only) (24)
0x05 OUT_Z_MSB: Z_MSB Register (Read Only) (24)
0x06 OUT_Z_LSB: Z_LSB Register (Read Only) (24)
0x0B: SYSMOD System Mode Register (24)
0x0B SYSMOD: System Mode Register (Read Only) (24)
Table13. SYSMOD Description (24)
0x0C: INT_SOURCE System Interrupt Status Register (25)
Table14. INT_SOURCE Description (25)
0x0D: WHO_AM_I Device ID Register (26)
0x0D: WHO_AM_I Device ID Register (Read Only) (26)
0x0E: XYZ_DATA_CFG Register (26)
0x0E: XYZ_DATA_CFG (Read/Write) (26)
Table15. XYZ Data Configuration Descriptions (26)
Table16. Full Scale Range (26)
0x0F: HP_FILTER_CUTOFF High Pass Filter Register (26)
faq什么意思0x0F HP_FILTER_CUTOFF: High Pass Filter Register (Read/Write) (26)
Table17. High Pass Filter Cut-off Register Descriptions (26)
Table18. High Pass Filter Cut-off Options (27)
6.2Portrait/ Landscape Embedded Function Registers (27)
0x10: PL_STATUS Portrait/Landscape Status Register (27)
0x10 PL_STATUS Register (Read Only) (27)
Table19. PL_STATUS Register Description (27)
0x11 Portrait/Landscape Configuration Register (28)
0x11 PL_CFG Register (Read/Write (28)
计算机培训学校Table20. PL_CFG Description (28)
0x12 Portrait/Landscape Debounce Counter (28)
0x12 PL_COUNT Register (Read/Write) (28)
Table21. PL_COUNT Description (28)
Table22. PL_COUNT Relationship with the ODR (28)
0x13: PL_BF_ZCOMP Back/Front and Z Compensation Register (28)
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0x13: PL_BF_ZCOMP Register (Read/Write) (28)
Table23. PL_BF_ZCOMP Description (28)
0x14: P_L_THS_REG Portrait/Landscape Threshold and Hysteresis Register (29)
0x14: P_L_THS_REG Register (Read/Write) (29)
Table24. P_L_THS_REG Description (29)
Table25. Trip Angles with Hysteresis for 45° Angle (29)
6.3Motion and Freefall Embedded Function Registers (29)
Mode 1: Freefall Detection with ELE = 0, OAE = 0 (29)
Mode 2: Freefall Detection with ELE = 1, OAE = 0 (29)
Mode 3: Motion Detection with ELE = 0, OAE = 1 (29)
Mode 4: Motion Detection with ELE = 1, OAE = 1 (29)
0x15 FF_MT_CFG Freefall/Motion Configuration Register (30)
0x15 FF_MT_CFG Register (Read/Write) (30)
Table26. FF_MT_CFG Description (30)
Figure13. FF_MT_CFG High and Low g Level (30)
0x16 FF_MT_SRC Freefall/Motion Source Register (30)
0x16: FF_MT_SRC Freefall and Motion Source Register (Read Only) (30)
Table27. Freefall/Motion Source Description (31)
0x17: FF_MT_THS Freefall and Motion Threshold Register (31)
0x17 FF_MT_THS Register (Read/Write) (31)
Table28. FF_MT_THS Description (31)
MMA8452Q Sensors
Table30. FF_MT_COUNT Relationship with the ODR (32)
Figure14. DBCNTM Bit Function (33)
6.4Transient (HPF) Acceleration Detection (34)
0x1D: Transient_CFG Register (34)
0x1D TRANSIENT_CFG Register (Read/Write) (34)
Table31. TRANSIENT_CFG Description (34)
0x1E TRANSIENT_SRC Register (34)
0x1E TRANSIENT_SRC Register (Read Only) (34)
Table32. TRANSIENT_SRC Description (34)
0x1F TRANSIENT_THS Register (35)
0x1F TRANSIENT_THS Register (Read/Write) (35)
Table33. TRANSIENT_THS Description (35)
0x20 TRANSIENT_COUNT (35)
0x20 TRANSIENT_COUNT Register (Read/Write) (35)
Table34. TRANSIENT_COUNT Description (35)
Table35. TRANSIENT_COUNT Relationship with the ODR (35)
6.5Single, Double and Directional Tap Detection Registers (36)
0x21: PULSE_CFG Pul Configuration Register (36)
0x21 PULSE_CFG Register (Read/Write) (36)
Table36. PULSE_CFG Description (36)
0x22: PULSE_SRC Pul Source Register (36)
0x22 PULSE_SRC Register (Read Only) (36)
Table37. PULSE_SRC Description (36)
0x23 - 0x25: PULSE_THSX, Y, Z Pul Threshold for X, Y & Z Registers (37)
0x23 PULSE_THSX Register (Read/Write) (37)
Table38. PULSE_THSX Description (37)
0x24 PULSE_THSY Register (Read/Write) (37)
新东方网Table39. PULSE_THSY Description (37)
0x25 PULSE_THSZ Register (Read/Write) (37)
Table40. PULSE_THSZ Description (37)
0x26: PULSE_TMLT Pul Time Window 1 Register (37)
0x26 PULSE_TMLT Register (Read/Write) (37)
Table41. PULSE_TMLT Description (37)
Table42. Time Step for PULSE Time Limit (Reg 0x0F) Pul_LPF_EN = 1 (37)
Table43. Time Step for PULSE Time Limit (Reg 0x0F) Pul_LPF_EN = 0 (38)
0x27: PULSE_LTCY Pul Latency Timer Register (38)
0x27 PULSE_LTCY Register (Read/Write) (38)
Table44. PULSE_LTCY Description (38)
Table45. Time Step for PULSE Latency @ ODR and Power Mode (Reg 0x0F) Pul_LPF_EN = 1 (38)
Table46. Time Step for PULSE Latency @ ODR and Power Mode (Reg 0x0F) Pul_LPF_EN = 0 (38)
0x28 PULSE_WIND Register (Read/Write) (39)
Table47. PULSE_WIND Description (39)
Table48. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pul_LPF_EN = 1 (39)
Table49. Time Step for PULSE Detection Window @ ODR and Power Mode (Reg 0x0F) Pul_LPF_EN = 0 (39)
6.6Auto-WAKE/SLEEP Detection (40)
0x29 ASLP_COUNT Register (Read/Write) (40)
Table50. ASLP_COUNT Description (40)
Table51. ASLP_COUNT Relationship with ODR (40)
Table52. SLEEP/WAKE Mode Gates and Triggers (40)
6.7Control Registers (41)
0x2A: CTRL_REG1 System Control 1 Register (41)
0x2A CTRL_REG1 Register (Read/Write) (41)
Table53. CTRL_REG1 Description (41)
Table54. SLEEP Mode Rate Description (41)
Table55. System Output Data Rate Selection (41)
Table56. Full Scale Selection (41)
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Sensors
Table58. MODS Oversampling Modes (42)
Table59. MODS Oversampling Modes Current Consumption and Averaging Values at each ODR (42)
0x2C: CTRL_REG3 Interrupt Control Register (43)
0x2C CTRL_REG3 Register (Read/Write) (43)
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Table60. CTRL_REG3 Description (43)
0x2D: CTRL_REG4 Register (Read/Write) (43)
0x2D CTRL_REG4 Register (Read/Write) (43)
Table61. Interrupt Enable Register Description (43)
0x2E CTRL_REG5 Register (Read/Write) (44)
0x2E: CTRL_REG5 Interrupt Configuration Register (44)
Table62. Interrupt Configuration Register Description (44)
6.8Ur Offt Correction Registers (44)
0x2F: OFF_X Offt Correction X Register (44)
0x2F OFF_X Register (Read/Write) (44)
Table63. OFF_X Description (44)
0x30: OFF_Y Offt Correction Y Register (44)
0x30 OFF_Y Register (Read/Write) (44)
Table64. OFF_Y Description (44)
0x31: OFF_Z Offt Correction Z Register (44)
0x31 OFF_Z Register (Read/Write) (44)
Table65. OFF_Z Description (44)
Table66. MMA8452Q Register Map (45)
Table67. Accelerometer Output Data (46)
Package Dimensions (47)
MMA8452Q Sensors
