User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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11.4. EMC Recommendations
All LE940B6 signals are provided with some EMC protection. Nevertheless, the accepted level
differs according to the specific pin. Table 40 lists the characteristics.
Table 40: EMC Recommendations
Pad Signal I/O Function Contact Air
Antenna
AD1, AU9 Antenna
pads
I/O Antenna pads ± 4 KV ± 8 KV
All other pins have the following characteristics:
• HBM JESD22-A114-B ± 1000 V
• CDM JESD22-C101-C ± 250 V
Warning:
Do not touch without proper electrostatic protective equipment. The product must be handled
with care, avoiding any contact with the pins because electrostatic discharge may damage the
product.
11.5. Download and Debug Port
This section provides recommendations for the design of the host system used to download or
upgrade the Telit software and to debug the LE940B6 module when it is already mounted on a
host system.
• For downloading or upgrading the Telit software
In the LE940B6 module, firmware updates by the host are only possible via USB and not via
UART.
So even if USB interface is not used, it is still highly recommended to place an optional USB
connector on the application board.At the minimum, test points of the USB signals are
required to enable SW update.
• For debugging of the LE940B6 module
USB, Auxiliary UART and JTAG interfaces can be used for debugging the LE940B6 module.
Even if USB or JTAG are not used for debugging, it is recommended to have at least the
Auxiliary UART pins exposed to outside for debugging purposes.