CMA3000-D0X Datasheet, PDF (24/35 Pages) VTI technologies – 3-axis accelerometer

CMA3000-D0X Series
7.3 Recommended PWB layout
General PWB layout recommendations for CMA3000 products (refer to Figure 15 and Figure 16):
1. Locate 100 nF SMD capacitors right next to the CMA3000 package
2. Ensure low impedance by maximizing the ground plane under the component.
Recommended PWB pad layout for CMA3000 is presented in Figure 16 below (dimensions in
micrometers, [µm]).
Figure 16. Recommended PWB pad layout for CMA3000.
Recommended PWB layout for the CMA3000-D0X is presented in Figure 17 below (circuit diagram
presented in Figure 15 above).
Note the symmetrical
ground plane under the
component.
Figure 17. Recommended PWB layout for CMA3000-D0X with SPI interface (not
actual size, for reference only).
7.4 Mounting recommendations
For the best sensor stability mechanical stresses due to mounting should be minimized. Potential
causes of mechanical stress to be avoided are
• Contact with other structures due to too small mechanical tolerances.
• Placement under or next to mechanical push button contacts.
• Locations near hot spots (micro controller, power amplifier etc) due to temperature effects.
• Mounting close to PWB attachment point e.g. screw or snap.
VTI Technologies Oy
www.vti.fi
Doc.Nr. 8281000.12
24/ 35
Rev. 0.12