5G Module Series
RM500Q-AE&RM502Q-AE Hardware Design
RM500Q-AE&RM502Q-AE_Hardware_Design 38 / 86
1. Hot-plug function is invalid if the configured value of <insert_level> is inconsistent with hardware
design.
2. Hot-plug function setting takes effect after the module is restarted.
3. The underlined value is the default parameter value.
4. USIM1_DET is pulled LOW by default, and will be internally pulled up to 1.8 V by software
configuration only when (U)SIM hot-plug is enabled by AT+QSIMDET.
4.1.3. Normally Closed (U)SIM Card Connector
With a normally closed (U)SIM card connector, USIM1_DET pin is shorted to ground when there is no
(U)SIM card inserted. (U)SIM card detection by high level is applicable to this type of connector. After
executing AT+QSIMDET=1,1 to enable the (U)SIM hot-plug: when a (U)SIM card is inserted,
USIM1_DET will change from low to high level; when the (U)SIM card is removed, USIM1_DET will
change from high to low level.
⚫ When the (U)SIM is absent, CD is shorted to ground and USIM1_DET is at low level.
⚫ When the (U)SIM is present, CD is open from ground and USIM1_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 (U)SIM Card
Connector
USIM1_DET
USIM1_DATA
USIM1_CLK
RST
CLK
CD
IO
USIM1_VDD
USIM1_VDD
USIM1_RST
VCC
GND
VPP
GND
TVS
22 Ω
22 Ω
22 Ω
10k-20k
100 nF
33 pF 33 pF 33 pF
NOTE: All these resistors, capacitors and TVS should be close to (U)SIM card connector in PCB layout.
Figure 15: Reference Circuit for Normally Closed (U)SIM Card Connector
4.1.4. 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.
After executing AT+QSIMDET=1,0 to enable the (U)SIM hot-plug: when a (U)SIM card is inserted,
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