U)Sim Interfaces (J503/J504) - Quectel SC20-EL Manual

EVB
Figure 21: Reference Circuit Design for Microphone and Earphone Interfaces

3.8. (U)SIM Interfaces (J503/J504)

The Smart EVB provides the following two (U)SIM card (2.95V or 1.8V) connectors:
⚫
J503: (U)SIM1 card connector
⚫
J504: (U)SIM2 card connector
The following figure shows the simplified interface schematic for J503.
USIM_VDD
USIM_ RST
USIM_CLK
USIM_DATA
USIM _ DETECT
EVB
Figure 22: Simplified Interface Schematic for (U)SIM1 Card Connector (J503)
Smart_ EVB_User_Guide
100pF
FB
MIC1_P
MIC1_N
EAR_P
EAR_N
100 pF
GND
GND
ESD ESD
33pF 33pF
ESD ESD
33pF 33pF
C1
USIM _VDD
C5
USIM _GND
C 2
USIM _ RST
C6
USIM_VPP
C3
USIM _CLK
C7
USIM _ DATA
CD2
USIM _ PRE
(U)SIM card connector
CD1
USIM _GND
Smart LTE Module Series
Smart EVB User Guide
U701 MIC
Earphone
Push - Push
J503
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