LPWA Module Series
BG77 Hardware Design
BG77_Hardware_Design 17 / 76
3. ADC input voltage must not exceed 1.8V
4. The input voltage range of USB_VBUS is 1.3V~1.8V.
5. Keep all RESERVED pins and unused pins unconnected.
6. GND pins should be connected to ground in the design.
7. W_DISABEL#, AP_READY, USIM_DET, PCM, I2C, GRFC and GPIO functions are under
development.
8. SPI_MOSI(pin40), NETLIGHT(pin79) and GPRC1(pin83) are BOOT_CONFIG pins, They should not
be pulled up before startup.
3.2. Pin Description
The following tables show the pin definition and description of BG77.
Table 3: Definition of I/O Parameters
Table 4: Pin Description
Type
Description
AI Analog
Input
AO Analog
Output
DI Digital
Input
DO Digital
Output
IO Bidirectional
OD Open
Drain
PI Power
Input
PO Power
Output
Power Supply
Pin Name
Pin
No.
I/O
Description
DC Characteristics Comment
VBAT 19,
20
PI
Power supply
for the module
Vmax=4.8V
Vmin=2.6V
Vnorm=3.3V
