User's Manual

LTE Module Series
EC25-V User Manual
EC25-V_User_Manual Confidential / Released 32 /
69
V
IL
≤ 0.5V
V
IH
≥ 1.3V
VBAT
≥Treset_min
RESETTING
Module
Status
RUNNING
RESET_N
RUNNING
≤Treset_max
Figure 16: Timing of Resetting Module
1. Use the RESET_N only when turning off the module by the command AT+QPOWD and the
PWRKEY pin failed.
2. Ensure that there is no large capacitance on the PWRKEY and RESET_N pins.
3.9. USIM Card Interface
The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 9: Pin Definition of the USIM Interface
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
14
PO
Power supply for USIM card.
Either 1.8V or 3.0V is supported
by the module automatically.
USIM_DATA
15
IO
Data signal of USIM card.
USIM_CLK
16
DO
Clock signal of USIM card.
USIM_RST
17
DO
Reset signal of USIM card.
USIM_
PRESENCE
13
DI
USIM card insertion detection.
USIM_GND
10
Specified ground for USIM card.
NOTES