User's Manual

LE920A4 HW User Guide Application Guide
Doc#: 1VV0301261 Debug of the Module in Production
Rev. 4.3 Page 103 of 123 2017-12-07
11. Application Guide
Debug of the Module in Production
To test and debug the mounting of the module, it is strongly recommended to add several
test pads on the host PCB for the following purposes:
• Checking the connection between the module itself and the application board
• Testing the performance of the module by connecting it with an external computer
Depending on the customer application, these pads include, but are not limited to the
following signals:
• TXD
• RXD
• ON/OFF
• SHDN_N
• RESET_N
• GND
• VBATT
• TX_AUX
• RX_AUX
• USB_VBUS
• USB_D+
• USB_D-
• GPIO20
• WCI_RX
In addition, the following signals are also recommended (but not mandatory):
• PWRMON
• STAT_LED
• SW_RDY