Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 49 / 112
1. Use RESET_N only when turning off the module by AT+QPOWD command and PWRKEY pin failed.
2. Ensure that there is no large capacitance on PWRKEY and RESET_N pins.
3.9. (U)SIM Interface
The(U)SIM interface circuitry meets ETSI and IMT-2000 requirements. Both 1.8V and 3.0V (U)SIM cards
are supported.
Table 9: Pin Definition of the (U)SIM Interface
EC25 supports (U)SIM card hot-plug via the USIM_PRESENCE pin. The function supports low level and
high level detections, and it is disabled by default. Please refer to document [2] for more details about
AT+QSIMDET command.
Pin Name Pin No. I/O Description Comment
USIM_VDD 14 PO Power supply for (U)SIM card
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA 15 IO Data signal of (U)SIM card
USIM_CLK 16 DO Clock signal of (U)SIM card
USIM_RST 17 DO Reset signal of (U)SIM card
USIM_
PRESENCE
13 DI (U)SIM card insertion detection
USIM_GND 10 Specified ground for (U)SIM card
NOTES