MC3233 3-Axis Accelerometer
GENERAL DESCRIPTION
FEATURES
Preliminary Datasheet
The MC3233 is a low-noise, integrated
digital output 3-axis accelerometer with a
feature set optimized for cell phones and
consumer product motion sensing.
Applications include user interface control,
gaming motion input, electronic compass tilt
compensation for cell phones, game
controllers, remote controls and portable
media products.
Range, Sampling & Power
± 1.5g range
6,7, or 8-bit resolution
1 to 128 samples/sec
Low power operation
5 μA at 1 sample/sec
30 μA at 128 sample/sec
Auto-wake/sniff modes
Event Detection
Accurate event detection is enabled with a
low noise architecture that minimizes false
triggering found in competing devices. Low
noise and low power are inherent in the
monolithic fabrication approach, where the
MEMS accelerometer is integrated in a
single-chip with the electronics integrated
circuit.
Low-noise architecture minimizes
false triggering
Tap, Shake, Drop
Portrait or landscape orientation with
programmable hysteresis
Tilt detection in six orientations
Simple System Integration
The sample rate of the MC3233 can be
programmed from 1 to 128 samples /
second. Even greater power savings can be
achieved by taking advantage of event
detection while the device is in a low power
mode. Specific orientation and gesture
conditions can trigger an interrupt to a
remote MCU, allowing the processor to
remain in a standby state until an event
occurs. Alternatively, the device supports
the reading of sample and event status via
polling.
I2C interface, up to 400 kHz
3 × 3 × 1.0 mm 10-pin VLGA
package
o
Pin-compatible to Freescale
MMA7660
Single-chip 3D silicon MEMS
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MC3233 3-Axis Accelerometer
Preliminary Datasheet
TABLE OF CONTENTS
1
2
3
3.1
3.2
3.3
3.4
Order Information............................................................................................................. 5
Functional Block Diagram ................................................................................................ 6
Packaging and Pin Description ........................................................................................ 7
Package Outline ................................................................................................................... 7
Pin Description ..................................................................................................................... 8
Typical Application Circuit .................................................................................................... 9
Tape and Reel ................................................................................................................... 10
4
4.1
4.2
4.3
Specifications................................................................................................................. 12
Absolute Maximum Ratings ................................................................................................ 12
Sensor Characteristics ....................................................................................................... 13
Electrical and Timing Characteristics.................................................................................. 14
4.3.1
4.3.2
4.3.3
5
5.1
5.2
Electrical Power and Internal Characteristics ....................................................... 14
I2C Electrical Characteristics ............................................................................... 15
I2C Timing Characteristics ................................................................................... 16
Sensor Sampling ................................................................................................................ 17
Offset and Gain Calibration ................................................................................................ 18
General Operation ......................................................................................................... 17
6
7
7.1
Operational States ......................................................................................................... 19
Operational State Flow .................................................................................................. 20
Sampling Rates .................................................................................................................. 22
8
8.1
8.2
8.3
8.4
Interrupts........................................................................................................................ 23
Enabling and Clearing Interrupts ........................................................................................ 23
Interrupt Support ................................................................................................................ 24
GINT Interrupt .................................................................................................................... 25
Event Detection .................................................................................................................. 26
9
9.1
9.2
9.3
Orientation Detection ..................................................................................................... 27
Orientation Event Filter....................................................................................................... 27
Orientation Hysteresis ........................................................................................................ 27
Portrait/Landscape Events ................................................................................................. 27
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MC3233 3-Axis Accelerometer
9.4
9.5
9.6
9.7
9.8
Preliminary Datasheet
Front/Back Events .............................................................................................................. 32
Shake Detection ................................................................................................................. 34
Drop Detection ................................................................................................................... 36
Tap Detection ..................................................................................................................... 37
Continuous Sampling ......................................................................................................... 39
10
10.1
10.2
10.3
I2C Interface .................................................................................................................. 40
Physical Interface ............................................................................................................... 40
Timing ................................................................................................................................ 40
I2C Message Format .......................................................................................................... 40
11
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
Register Interface .......................................................................................................... 42
Register Summary ............................................................................................................. 43
XOUT, YOUT & ZOUT: X, Y & Z-Axis Accelerometer Registers......................................... 45
TILT: Status Register ......................................................................................................... 46
OPSTAT: Operational State Status Register ...................................................................... 48
SC: Sleep Counter Register ............................................................................................... 49
INTEN: Interrupt Enable Register ....................................................................................... 50
MODE: Register ................................................................................................................. 51
SAMPR: Sample Rate Register.......................................................................................... 52
TAPEN: Tap Detection Enable Register ............................................................................. 54
TAPP: Tap Pulse Register ................................................................................................. 55
DROP: Drop Event Control Register .................................................................................. 56
SHDB: Shake Debounce Register ...................................................................................... 57
X-Axis Offset Registers ...................................................................................................... 58
Y-Axis Offset Registers ...................................................................................................... 59
Z-Axis Offset Registers ...................................................................................................... 60
X-Axis Gain Registers ........................................................................................................ 61
Y-Axis Gain Registers ........................................................................................................ 62
Z-Axis Gain Registers ........................................................................................................ 63
SHAKE_TH: Shake Threshold Register ............................................................................. 64
UD_Z_TH: Up/Down Z Axis Threshold Register ................................................................. 65
UD_X_TH: Up/Down X Axis Threshold Register ................................................................ 66
RL_Z_TH: Right/Left Z Axis Threshold Register ................................................................. 67
RL_Y_TH: Right/Left Y Axis Threshold Register ................................................................ 68
FB_Z_TH: Front/Back Z Axis Threshold Register ............................................................... 69
11.10
11.11
11.12
11.13
11.14
11.15
11.16
11.17
11.18
11.19
11.20
11.21
11.22
11.23
11.24
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MC3233 3-Axis Accelerometer
11.25
11.26
11.27
Preliminary Datasheet
DROP_TH: Drop Threshold Register ................................................................................. 70
TAP_TH: Tap Threshold Register ...................................................................................... 71
PCODE: Product Code....................................................................................................... 72
12
12.1
12.2
Example MC3233 Configuration .................................................................................... 73
Example: Tap Demo .......................................................................................................... 73
Example: GINT Interrupt with Auto-Wake and Auto-Sniff Enabled ..................................... 74
13
14
15
Index of Tables .............................................................................................................. 75
Revision History ............................................................................................................. 77
Legal .............................................................................................................................. 78
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MC3233 3-Axis Accelerometer
Preliminary Datasheet
1 ORDER INFORMATION
Part Number
MC3233
Resolution
8-bit
Order Number
MC3233-I5
Package
VLGA-10
Shipping
Tape & Reel, 5Ku
Table 1. Order Information
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