AN0002.2: EFR32 Wireless Gecko Series 2 Hardware Design Considerations

PublishTime： 2020-05-07 Manufacturer： Silicon Labs Type： Application note & Design Guide Language： English

This application note details hardware design considerations for EFR32 Wireless Gecko Series 2 devices. For hardware design considerations for EFM32 and EZR32 Wireless MCU Series 0 and EFM32 and EFR32 Wireless Gecko Series 1 devices, refer to AN0002.0: EFM32 and EZR32 Wireless MCU Series 0 Hardware Design Considerations and AN0002.1: EFM32 and EFR32 Wireless MCU Series 1 Hardware Design Considerations, respectively.
Topics specifically covered are supported power supply configurations, supply filtering considerations, debug interface connections, and external clock sources.
Although the EFR32 Wireless Gecko Series 2 devices have very low average current consumption, proper decoupling is crucial. As for all digital circuits, current is drawn in short pulses corresponding to the clock edges. Particularly when several I/O lines are switching simultaneously, transient current pulses on the power supply can be in the order of several hundred mA for a few nanoseconds, even though the average current consumption is quite small.
These kinds of transient currents cannot be properly delivered over high impedance power supply lines without introducing considerable noise in the supply voltage. To reduce this noise, decoupling capacitors are employed to supplement the current during these short transients.
KEY POINTS:
• Decoupling capacitors are crucial to ensuring the integrity of the device's power supplies.
• The debug interface consists of two communication pins (SWCLK and SWDIO).
• External clock sources must be connected to the device correctly for proper operation.

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