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MMA8491Q Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

Part No. MMA8491Q
Description  Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MMA8491Q Datasheet(HTML) 12 Page - Freescale Semiconductor, Inc

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MMA8491Q
Sensors
12
Freescale Semiconductor, Inc.
3.4
Power-up timing sequences
The power-up timing sequence for MMA84591Q is shown in Figure 8, where VDD is powered and the EN pin is activated to
acquire a single sample. Additional samples can be acquired by repeating the EN pulse.
Figure 8. MMA8491Q timing sequence
tON is the time between EN to the end of ACTIVE stage, after which the newly acquired sample data is available.
3.5
45° tilt detection
The output value changes according to the absolute value of the acceleration of the MMA8491Q compared to the threshold:
When the acceleration’s absolute value > the threshold 0.688g, the output = ‘1’.
When the acceleration’s absolute value
the threshold, the output = ‘0’.
For example,
When the MMA8491Q is set on a table, it senses 1g acceleration on Z-axis and senses 0g on X and Y axes.
When the MMA8491Q is flipped upside down on the table, it senses -1g acceleration on Z-axis and senses 0g on X and Y
axes.
In both cases Xout = 0, Yout = 0, and Zout = 1.
VDD
EN
OFF
ACTIVE
STANDBY
SHUTDOWN
SHUTDOWN
tON
Data
Data
Available
Hi-Z
Output
1, when
g-value
0.688g
>
()
0, when
g-value
0.688g
()
=


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