Datasheet

ATBTLC1000 Hardware Design Guidelines – Ultra Low Power BLE 4.1 SoC [USER GUIDE]
Atmel-42537B-ATBTLC1000-Hardware-Design-Guidelines_UserGuide_102015
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Figure 3-7. Routing of 1P2V Supply
Additionally, while the VBAT_BUCK (pin 15) supply is not sensitive to picking up noise, it is a noise
generating supply. Therefore, be sure to keep the decoupling capacitors for this supply pin as close as
possible to the VBAT_BUCK pin and make sure that the route for this supply stays far away from sensitive
pins and supplies.
3.9 Additional Suggestions
Make sure that traces route directly through the pads of all filter capacitors and not by a stub route. Figure
3-8 shows the correct way to route through a capacitor pad. Figure 3-9 shows a stub route to the
capacitor pad. This should be avoided as it adds additional impedance in series with the capacitor.
Figure 3-8. Correct Routing Through Capacitor Pad