LPWA Module Series
BC950N-N1 Hardware Design
decouple capacitor between SIM_VDD and GND should be not more than
1μF and
be placed close
to the USIM card connector.
To avoid cross talk between SIM_DATA and SIM_CLK, keep them away from each other and shield
them separately with surrounded ground.
In order to offer good ESD protection, it is recommended to add a TVS diode array. For more
information of TVS diode, please visit http://www.onsemi.com. The ESD protection device should be
placed as close to USIM card connector as possible, and make sure the USIM card signal lines go
through the ESD protection device first and then to the module.
The 22Ω resistors should be
connected in series between the module and the USIM card connector so as to suppress EMI
spurious transmission and enhance ESD protection. Please note that the USIM peripheral circuit
should be close to the USIM card connector.
Place the RF bypass capacitors (33pF) close to the USIM card connector on all signal traces to
improve EMI suppression.
3.10. ADC Interface*
The module provides a 10-bit ADC input channel to read the voltage value. The interface is available in
active mode, and has to be woken up first to ensure availability in sleep modes.
Table 14: Pin Definition of ADC Interface
“*” means under development.
Pin Name
Pin No.
Description
Voltage Range
ADC
21
Analog to digital converter interface.
0V~1.4V
NOTE
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