Normally Open (U)Sim Card Connector - Quectel EM160R-GL Hardware Design

(U)SIM hot-plug is enabled by executing AT+QSIMDET=1,1, a (U)SIM card insertion will drive USIM_DET
from low to high level, and the removal of it will drive USIM_DET from high to low level.
⚫
When the (U)SIM is absent, CD is shorted to ground and USIM_DET is at low level.
⚫
When the (U)SIM is present, CD is open from ground and USIM_DET is at high level.
The following figure shows a reference design for (U)SIM interface with a normally closed (U)SIM card
connector.
Module
USIM_VDD
10 kΩ
USIM_DATA
NOTE: All these resistors, capacitors and TVS array should be close to (U)SIM card connector in PCB layout.
The external pull-up resistor of USIM_DATA is optional.
Figure 12: Reference Circuit of Normally Closed (U)SIM Card Connector

3.6.3. Normally Open (U)SIM Card Connector

With a normally open (U)SIM card connector, CD1 and CD2 of the connector are disconnected when
there is no (U)SIM card inserted. (U)SIM card detection by low level is applicable to this type of connector.
Once (U)SIM hot-plug is enabled by executing AT+QSIMDET=1,0, a (U)SIM card insertion will drive
USIM_DET from high to low level, and the removal of it will drive USIM_DET from low to high level.
⚫
When the (U)SIM is absent, CD1 is open from CD2 and USIM_DET is at high level.
⚫
When the (U)SIM is present, CD1 is pull down to ground and USIM_DET is at low level.
EM160R-GL_Hardware_Design
20K
USIM_VDD
22R
USIM_RST
22R
USIM_CLK
USIM_DET
22R
GND
(U)SIM Card
Connector
100 nF
VCC
RST
CLK
CD
IO
GND
TVS array
LTE-A Module Series
VPP
33 / 73