Users Manual

LTE Standard Module Series

EC25 Hardware Design

EC25_Hardware_Design

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The reset scenario is illustrated in the following figure.

Figure 16: Timing of Resetting Module

1. Use RESET_N only when failed to turn off the module by AT+QPOWD command and PWRKEY pin.

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 (U)SIM Interface

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

1.8V power domain.

If unused, keep it open.

USIM_GND 10 Specified ground for (U)SIM card

NOTES