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Please assure that there is no large capacitance on PWRKEY and RESET pins.
3.9. (U)SIM Interfaces
The (U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8 V and 3.0 V (U)SIM cards are
supported.
Table 11: Pin Definition of (U)SIM Interface
Pin Name
Pin No.
USIM1_VDD
251
USIM1_DATA
254
USIM1_CLK
253
USIM1_RST
250
USIM1_DET
255
USIM2_VDD
256
USIM2_DATA
257
USIM2_CLK
259
USIM2_RST
260
USIM2_DET
258
The module supports (U)SIM card hot-plug via the USIM_DET pin and either low level or high level detection is
supported. The function is disabled by default and can be enabled by AT+QSIMDET. See document [3] for more
details of the command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
AG521R-NA_QuecOpen_Hardware_Design
I/O
Description
PO
(U)SIM1 card power supply
IO
(U)SIM1 card data
DO
(U)SIM1 card clock
DO
(U)SIM1 card reset
DI
(U)SIM1 card hot-plug detect
PO
(U)SIM2 card power supply
IO
(U)SIM2 card data
DO
(U)SIM2 card clock
DO
(U)SIM2 card reset
DI
(U)SIM2 card hot-plug detect
Automotive Module Series
AG521R-NA QuecOpen Hardware Design
Comment
Either 1.8 V or 3.0 V is supported
by the module automatically.
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