User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 40 / 90
The following figure shows a reference design for USIM card interface with an 8-pin USIM card connector.
Figure 17: Reference Circuit of USIM Card Interface with an 8-Pin USIM Card Connector
If USIM card detection function is not needed, please keep USIM_PRESENCE unconnected. Areference
circuit for USIM card interface witha 6-pin USIM card connector is illustrated inthe following figure.
Figure 18: Reference Circuit of USIM Card Interface with a 6-Pin USIM Card Connector