Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 50 / 134
V
IL
 0.5 V
V
IH
1.3 V
VBAT
 150 ms
Resetting
Module
Status
Running
RESET_N
Restart
 460 ms
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 1.8 V and 3.0 V (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 1.8 V or 3.0 V 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
1.8 V power domain.
If unused, keep it open.
USIM_GND
10
Specified ground for (U)SIM card
NOTES