Cellular Stmod+ Expansion Board; Table 2. Stmod+ Connector Pin Description; Figure 3. Mother Board And Expansion 2G/3G Modem Bottom View - STMicroelectronics UM2322 User Manual

UM2322
7.2

Cellular STMod+ expansion board

The expansion board is a GSM/UMTS/HSDPA modem based on Quectel UG96 module.
The UG96 is a GSM 4-Band 800/850/900/1900/2100, UMST 5-Band
800/850/900/1900/2100 supporting HSDPA. The connection with the STM32L496AGI6-
based Discovery mother board is done through the STMod+ connector.
STMod+ IOX=pin x

Figure 3. Mother board and expansion 2G/3G modem bottom view

Table 2. STMod+ connector pin description

Pin name
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7 STMod+ IO7
pin 8 Sim_select1
pin 9
CTSS
RXDS
TXDS
RTSS
GND
VCC
PWRen
UM2322 Rev 2
Hardware layout and configuration
Pin function
Modem UART CTS
Modem UART RXD
Modem UART TXD
Modem UART RTS
Ground
+5V
I2C clock for EEPROM
Sim selection IO1 always set to 1
Modem power enable
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