User Manual
Table Of Contents
- 1 MG21USB Dongle Guide
- 1.1 Board Description
- 1.2 USB Dongle EFR32MG21 I/O Mapping
- 1.3 USB Dongle and Host Interface
- 1.4 USB Dongle Application FW Upgrade over USB through X-Modem Bootloader
- 1.5 MG21 Bootloader mode and Reset control
- 1.6 LED Indicators
- 1.7 PTA Debug Interface
- 1.8 Using the Mini-Simplicity interface on USB Dongle
- 1.9 MG21 USB Dongle v2 Components Placement
- 1.10 MG21 USB Dongle Test Points
- 2 MG21 USB Dongle firmware flashing, debugging and PTI Network Traffic Capture
- 3 MG21USB Dongle Certifications
- 4 Document Revision History
MG21USB Dongle Guide
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1.8 Using the Mini-Simplicity interface on USB Dongle
Factory default of the MG21 USB Dongle hasn’t the Mini-Simplicity connector J3 mounted. We recommend the Linux host to do
MG21 application firmware upgrade over USB using X-Modem file transfer through the Bootloader, instead of using SEGGER
J-Link SWD over the Mini-Simplicity debug interface.
Developer is required to purchase a 10-pin (2x5) small form-factor (1.27mm pitch, 3.05mm pin length) header connector, simi-
lar to Samtec part number FTSH-105-01-L-DV-K with guide pin or FTS-105-01-L-DV-TR without guide pin. Then manually
solder the header onto the USB Dongle PCB bottom side. Please note the pin-1 position of the Samtec connector with guide
pin.
Blow shows the pin-out for the 10-pin Mini-Simplicity connector and connector pin-functions:
VDD
1
2
GND
RST
3
4
VCOM_RX
VCOM_TX
5
6
SWO
SWDIO
7
8
SWCLK
PTI_FRAME
9
10
PTI_DATA
Note: Mini Simplicity Connector pin-out is referenced from the device target side.
Figure 1.4. Mini-Simplicity Connector Pin-Out
Pin #
Pin Name
Pin Function
EFR32 Functionality
1
VDD
3.3V power supply to external EFR32 target
VDD
2
GND
Target Ground
VSS
3
RST
Target Reset (Active Low)
RESETn
4
VCOM_RX
Target Pass-through UART/Virtual COM Port Receive
US0_RX
5
VCOM_TX
Target Pass-through UART/Virtual COM Port Transmit
US0_TX
6
SWO
Target Serial Wire Output
SWO
7
SWDIO
Target Serial Wire Data Input/Output
SWDIO
8
SWCLK
Target Serial Wire Clock
SWCLK
9
PTI_FRAME
Target Packet Trace Interface Frame Signal
FRC_DFRAME
10
PTI_DATA
Target Packet Trace Interface Data Signal
FRC_DOUT
Table 1.1. Mini-Simplicity Connector Pin Function
By default, USB Dongle’s MG21 VCOM_TX and VCOM_RX signals are directed to the CP2102N UART-to-USB bridge then to
the host USB port.
For Simplicity Studio to communicate with USB Dongle on-board MG21 VCOM UART through the Mini-Simplicity connector, it
is required to de-solder solder-joint jumper J2 to disconnect CP2102 from MG21 and solder jumper J4 near the mini-simplicity
header in figures shown on next page.