Quectel EM06 Series Manual page 32

Normally Open (U)SIM Card Connector:
⚫
When the (U)SIM card is absent, the switch is open and USIM_DET is at low level.
⚫
When the (U)SIM card is inserted, the switch is closed and USIM_DET is at high level.
If the (U)SIM card detection function is not needed, please keep USIM_DET unconnected. A reference
circuit for (U)SIM interface with a 6-pin (U)SIM card connector is illustrated in the following figure.
Module
Figure 15: Reference Design of (U)SIM Interface with a 6-Pin (U)SIM Card Connector
The timing of (U)SIM is illustrated by the following figure.
USIM_ VDD
USIM_ DATA
USIM_ CLK USIM_ CLK
USIM_ RST
Notes:
1. ta is the time interval between USIM_VDD HIGH level and USIM_CLK HIGH level.
2. tb is the time interval between USIM_VDD HIGH level and USIM_DATA HIGH level.
3. tc is the time interval between USIM_RST HIGH level and answer on USIM_DATA.
EM06_Series_Hardware_Design
USIM_VDD
15K
USIM_GND
USIM_VDD
22R
USIM_RST
USIM_CLK
22R
22R
USIM_DATA
33 pF 33 pF 33 pF
tb ta + 5 2 u s
ta 1.5 ms
Figure 16: Timing of (U)SIM
100 nF
GND GND
0.1 ms
21.7 ms
LTE-A Module Series
EM06 Series Hardware Design
(U)SIM Card Connector
VCC GND
RST VPP
CLK IO
tc 10 ms
ATR
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