Quectel RM500Q-AE - (U)SIM Interfaces

5G Module Series
RM500Q-AE&RM502Q-AE Hardware Design
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3.5.3.7. (U)SIM Interfaces
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both Class B (3.0 V) and Class C
(1.8 V) (U)SIM cards are supported, and Dual SIM Single Standby* function is supported.
Table 998: Pin Definition of (U)SIM Interfaces
“*” means under development.
RM500Q-AE&RM502Q-AE supports (U)SIM card hot-plug via the USIM_DET pin. With a normally closed
(U)SIM card connector, the USIM_DET is normally short-circuited to ground when a (U)SIM card is not
inserted, and the USIM_DET will change from low to high voltage level when a (U)SIM card is inserted.
The rising edge indicates an insertion of the (U)SIM card. When the (U)SIM card is removed, USIM_DET
will change from high to low voltage level. This falling edge indicates a removal of the (U)SIM card.
Normally Closed (U)SIM Card Connector:
⚫ When the (U)SIM is absent, CD is short-circuited to ground and USIM_DET is at low voltage level.
⚫ When the (U)SIM is inserted, CD is open from ground and USIM_DET is at high voltage level.
The following figure shows a reference design of (U)SIM interface with a normally closed (U)SIM card
connector.
Pin No.
Pin Name
I/O
Description
Comment
36
USIM_VDD
PO
Power supply for (U)SIM card
Class B (3.0 V) and Class C (1.8 V)
34
USIM_DATA
IO
(U)SIM card data
1.8/3.0 V power domain
32
USIM_CLK
DO
(U)SIM card clock
1.8/3.0 V power domain
30
USIM_RST
DO
(U)SIM card reset
1.8/3.0 V power domain
66
USIM_DET
DI
(U)SIM card insertion detection.
Internally pulled up
NOTE