
Figure 7.4. RF Trace Design Example
7.2 Proximity to Other Materials
Avoid placing plastic or any other dielectric material in close proximity to the antenna.
Any metallic objects in close proximity to the antenna will prevent the antenna from radiating freely. The minimum recommended dis-
tance of metallic and/or conductive objects is 10 mm in any direction from the antenna except in the directions of the application PCB
ground planes.
7.3 Proximity to Human Body
Placing the module in contact with or very close to the human body will negatively impact antenna efficiency and reduce range.
7.4 Reset
The MGM210P can be reset by pulling the RESET line low, by the internal watchdog timer, or by software command.
The reset state does not provide power saving functionality and it is not recommended as a means to conserve power.
7.5 Debug
See
AN958: Debugging and Programming Interfaces for Custom Designs
.
The MGM210P supports hardware debugging via 4-pin JTAG or 2-pin serial-wire debug (SWD) interfaces. It is recommended to ex-
pose the debug pins in your own hardware design for firmware update and debug purposes. The table below lists the required pins for
JTAG and SWD debug interfacing, which are also presented in Section
If JTAG interfacing is enabled, the module must be power cycled to return to a SWD debug configuration if necessary.
Table 7.1. Debug Pins
Pin Name
Pin Number
JTAG Signal
SWD Signal
Comments
PA04
4
TDI
N/A
This pin is disabled after reset. Once enabled the pin
has a built-in pull-up.
PA03
3
TDO
N/A
This pin is disabled after reset.
PA02
2
TMS
SWDIO
Pin is enabled after reset and has a built-in pull-up.
PA01
1
TCK
SWCLK
Pin is enabled after reset and has a built-in pull-down.
MGM210P Wireless Gecko Multi-Protocol Module Data Sheet
Design Guidelines
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