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MMA8491Q Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc

Part No. MMA8491Q
Description  Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
Download  26 Pages
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MMA8491Q Datasheet(HTML) 6 Page - Freescale Semiconductor, Inc

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MMA8491Q
Sensors
6
Freescale Semiconductor, Inc.
1.5
Recommended application diagram
Figure 5. VDD connects to power supply and EN is pulsed
To ensure the accelerometer is fully functional, connect the MMA8491Q as suggested in Figure 5.
A capacitor must be connected to the Bypass pin (pin 1) to assist the internal voltage regulator. It is recommended to use a
0.1
μF capacitor. The capacitor should be placed as near as possible to the Bypass pin.
The device power is supplied through the VDD line. The power supply decoupling capacitor should be placed as close as
possible to the VDD pin.
Use a 1.0 or 4.7
μF capacitor when the VDD and EN are not tied together.
When VDD and EN are tied together, then use a 0.1 μF capacitor. The 0.1 μF capacitor value has been chosen to
minimize the average current consumption while still maintaining an acceptable level of power supply high-
frequency filtering.
Both ground pins (pins 6 and 7) must be connected to ground.
When the I2C communication line is used, use a pullup resistor to connect to line SDA and SCL. The SCL line can be driven
by a push-pull driver, in which case, no pull-up resistor is necessary. If SDA and SCL pins are not used, then they should be
tied to ground.
1
2
3
4
10
9
8
7
56
12
11
Xout
Yout
Zout
Byp
VDD
4.7
μF
SDA
SCL
SDA
EN
VDD
4.7 k
Ω
Gnd
Xout
Yout
Zout
0V
VDD
Pulsed EN Signal
0.1
μF
EN
VDD
4.7 k
Ω
Gnd - VDD
Connect SDA/SCL
to Gnd when I2C bus
is not used.


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