MC3250 3-Axis Accelerometer
GENERAL DESCRIPTION
FEATURES
Preliminary Datasheet
The MC3250 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
± 2g / ± 4g / ± 8g ranges
10-bit or 14-bit resolution
1024 samples/sec
Programmable low pass filter
‒
From 8 to 512 Hz bandwidth
150 μA typical active current
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
I2C interface, up to 400 kHz
3 × 3 × 1.0 mm 16-pin package
‒
Pin-compatible to MMA845x,
ADXL346, LIS3DH, KXCJK, KXTIK
accelerometers
In the MC3250 the internal sample rate is
fixed at 1024 samples / second. Specific
orientation and gesture conditions can
trigger an interrupt to a remote MCU.
Alternatively, the device supports the
reading of sample and event status via
polling.
Single-chip 3D silicon MEMS
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MC3250 3-Axis Accelerometer
Preliminary Datasheet
TABLE OF CONTENTS
1
2
3
3.1
3.2
3.3
Order Information............................................................................................................. 5
Functional Block Diagram ................................................................................................ 6
Packaging and Pin Description ........................................................................................ 7
Package Outline ................................................................................................................... 7
Pin Description ..................................................................................................................... 8
Typical Application Circuit .................................................................................................... 9
4
4.1
4.2
4.3
Specifications................................................................................................................. 10
Absolute Maximum Ratings ................................................................................................ 10
Sensor Characteristics ....................................................................................................... 11
Electrical and Timing Characteristics.................................................................................. 12
4.3.1
4.3.2
4.3.3
5
5.1
5.2
Electrical Power and Internal Characteristics ....................................................... 12
I2C Electrical Characteristics ............................................................................... 13
I2C Timing Characteristics ................................................................................... 14
Sensor Sampling ................................................................................................................ 15
Offset and Gain Calibration ................................................................................................ 16
General Operation ......................................................................................................... 15
6
7
8
8.1
8.2
8.3
8.4
Operational States ......................................................................................................... 17
Operational State Flow .................................................................................................. 18
Interrupts........................................................................................................................ 19
Enabling and Clearing Interrupts ........................................................................................ 19
Interrupt Support ................................................................................................................ 20
GINT Interrupt .................................................................................................................... 21
Event Detection .................................................................................................................. 22
9
9.1
9.2
9.3
9.4
9.5
9.6
9.7
Orientation Detection ..................................................................................................... 23
Orientation Hysteresis ........................................................................................................ 23
Portrait/Landscape Events ................................................................................................. 23
Front/Back Events .............................................................................................................. 28
Shake Detection ................................................................................................................. 30
Drop Detection ................................................................................................................... 32
Tap Detection ..................................................................................................................... 33
Continuous Sampling ......................................................................................................... 35
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MC3250 3-Axis Accelerometer
10
10.1
10.2
10.3
Preliminary Datasheet
I2C Interface .................................................................................................................. 36
Physical Interface ............................................................................................................... 36
Timing ................................................................................................................................ 36
I2C Message Format .......................................................................................................... 36
11
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
Register Interface .......................................................................................................... 38
Register Summary ............................................................................................................. 39
TILT: Status Register ......................................................................................................... 41
OPSTAT: Operational State Status Register ...................................................................... 43
INTEN: Interrupt Enable Register ....................................................................................... 44
MODE: Register ................................................................................................................. 45
TAPEN: Tap Detection Enable Register ............................................................................. 46
TAPP: Tap Pulse Register ................................................................................................. 47
DROP: Drop Event Control Register .................................................................................. 48
SHDB: Shake Debounce Register ...................................................................................... 49
XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-Axis Extended Accelerometer Registers ....... 50
CHIPID: Chip Identification Register................................................................................... 51
OUTCFG: Output Configuration Register ........................................................................... 52
X-Axis Offset Registers ...................................................................................................... 53
Y-Axis Offset Registers ...................................................................................................... 54
Z-Axis Offset Registers ...................................................................................................... 55
X-Axis Gain Registers ........................................................................................................ 56
Y-Axis Gain Registers ........................................................................................................ 57
Z-Axis Gain Registers ........................................................................................................ 58
SHAKE_TH: Shake Threshold Register ............................................................................. 59
UD_Z_TH: Up/Down Z Axis Threshold Register ................................................................. 60
UD_X_TH: Up/Down X Axis Threshold Register ................................................................ 61
RL_Z_TH: Right/Left Z Axis Threshold Register ................................................................. 62
RL_Y_TH: Right/Left Y Axis Threshold Register ................................................................ 63
FB_Z_TH: Front/Back Z Axis Threshold Register ............................................................... 64
DROP_TH: Drop Threshold Register ................................................................................. 65
TAP_TH: Tap Threshold Register ...................................................................................... 66
PCODE: Product Code....................................................................................................... 67
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
11.25
11.26
11.27
12
12.1
Example Configuration .................................................................................................. 68
Example: Shake, Tap & Drop thresholds Demo ................................................................. 68
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MC3250 3-Axis Accelerometer
13
14
15
Preliminary Datasheet
Index of Tables .............................................................................................................. 70
Revision History ............................................................................................................. 72
Legal .............................................................................................................................. 73
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MC3250 3-Axis Accelerometer
Preliminary Datasheet
1 ORDER INFORMATION
Part Number
MC3250
Resolution
10 or 14-bit
Order Number
MC3250-I5
Package
VLGA-16
Shipping
Tape & Reel, 5Ku
Table 1. Order Information
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