Modem Power Supply And Reset; Sim Selection; Modem Firmware Update - ST STM32 User Manual

Hardware layout and configuration
STMod+ IOX=pin x
5.2.1

Modem power supply and reset

The cellular board is supplied through the 5V on the STMod+ connector (pins 6 and 15).
Pin 9 (power enable) activates the modem. A few seconds after this pin is driven, the red
LED is on to indicate that the modem is ready. The green LED starts flashing to indicate that
the modem is scanning for cell synchronization. At this time AT command can be sent using
UART.
If the power supply is not enough in signaling mode, the USB connector can provide an
additional power supply.
5.2.2

SIM selection

A switchable SIM interface is provided on the cellular modem board. The user selects either
the embedded SIM or the plastic SIM.
Set pin Sim_select0 to LOW to select the plastic SIM, or HIGH to select the embedded SIM.
5.2.3

Modem firmware update.

The modem firmware can be updated using the micro USB connector provided on the
modem:
1. First install the USB drivers of the modem from Quectel.
2. Install Qflash from Quectel and load the firmware.
3. Press start and reset the modem to download the firmware.
12/22
Table 3. STMod+ connector pin description (continued)
Pin name
pin 10
pin 11
pin 12
pin 13
pin 14
pin 15
pin 16
pin 17 Sim_RST
pin 18 Sim_select0
pin 19 Sim_DATA
pin 20
I2C
RIS
RST
sim_CLK
DTRS
VCC
GND
Sim selection IO0, 0 for plastic SIM and 1 for
STAS
UM2365 Rev 3
Pin function
I2C data for EEPROM
Modem ring indicator RI
Modem reset
SIM clock
Modem wake-up
+5V
Ground
Sim reset
embedded SIM
Sim data
Modem status
UM2365