5G HUB BG77 Technisch handboek en gebruikershandleiding - Pagina 13

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5G HUB BG77 Technisch handboek en gebruikershandleiding

Cortex Debug

Connector

ADC0

ADC1

GPIO26

GPIO64

SPI

USIM

USB Boot

Precaution

The USB dongle runs at 3.3V. The maximum voltage that the I/O pins can tolerate is 3.3V.

Applying voltages higher than 3.3V to any I/O pin could damage the board

2.9 BG77 chipset

All functionality of the BG77 shipset shall be implemented excluding the following features. That is, the

following features are not supported [1][2].

Audio, Earphone, and Codes are not supported.

PCM and I

C are not supported

PSM_IND and AP_READY are not supported

2.10 Interface between SAM21D and BG77

The Microcontroller communicates with the BG77 through UART interfaces:

UART1: (PA12/PA13/PA14/PA15). Used for data transmission and AT command communication

115200bps by default. The default frame format is 8N1 (8 data bits, no parity, 1 stop bit) Support

RTS and CTS hardware flow control.

UART3: (PB23/PB22). Used for outputting GNSS data or NEMA sentences 115200bps baud rate.

USB Dongle Rev 1.0

Using Single Wire Debug to burn bootloader and debug the

board

Connected to BG77. General purpose analogue to digital converter

Connected to BG77. General purpose IO

Connected to BG77.

Used to insert a Nano USIM. Connected to BG77

Connected to BG77. Force the BG77 to enter emergency download

mode