
5G Module Series
RM502Q-GL Hardware Design
RM502Q-GL_Hardware_Design 30 / 77
3.6. (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 8: Pin Definition of (U)SIM Interfaces
“*” means under development.
RM502Q-GL supports (U)SIM card hot-plug via the USIM_DET pin, which is a level trigger 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 level when the (U)SIM card
is inserted. The rising edge indicates insertion of the (U)SIM card. When the (U)SIM card is removed, the
USIM_DET will change from high to low level. This falling edge indicates the absence of the (U)SIM card.
The following figure shows a reference design of (U)SIM interface with a normally closed (NC) (U)SIM
card connector.
Pin No. Pin Name
I/O
Description
Comment
36
USIM1_VDD PO
Power supply for (U)SIM1 card Class B (3.0 V) and Class C (1.8 V)
34
USIM1_DATA IO
(U)SIM1 card data
1.8/3.0 V power domain
32
USIM1_CLK
DO
(U)SIM1 card clock
1.8/3.0 V power domain
30
USIM1_RST
DO
(U)SIM1 card reset
1.8/3.0 V power domain
66
USIM1_DET
DI
(U)SIM1 card insertion
detection.
Internally pulled up
48
USIM2_VDD PO
Power supply for (U)SIM2 card
Either 1.8 V or 3.0 V is supported
automatically.
42
USIM2_DATA IO
(U)SIM2 card data
1.8/3.0 V power domain
44
USIM2_CLK
DO
(U)SIM2 card clock
1.8/3.0 V power domain
46
USIM2_RST
DO
(U)SIM2 card reset
1.8/3.0 V power domain
40
USIM2_DET
DI
(U)SIM2 card insertion
detection.
Internally pulled up to 1.8 V
NOTE