U)Sim Interfaces - Quectel EG91 Series Hardware Design

The reset scenario is illustrated in the following figure.
VBA T
RESET_N
Module
Status
NOTE
1. Use RESET_N only when turning off the module by AT+QPOWD and PWRKEY pin are failed.
2. Ensure that there is no large capacitance on PWRKEY and RESET_N pins.

3.9. (U)SIM Interfaces

EG91 series module provides two (U)SIM interfaces, and only one (U)SIM card can work at a time. The
(U)SIM1 and (U)SIM2 cards can be switched by AT+QDSIM. For more details, refer to document [3].
The (U)SIM interfaces circuitry meet 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 Interfaces
Pin Name
USIM_GND
USIM1_VDD
USIM1_DATA
USIM1_CLK
EG91_Series_Hardware_Design
≥ 150 ms
Running
Figure 16: Timing of Resetting the Module
Pin No. I/O Description
47 Specified ground for (U)SIM card
43 PO (U)SIM1 card power supply
45 DIO (U)SIM1 card data
46 DO (U)SIM1 card clock
≤ 460 ms
V ≤ 0.5 V
IL
Resetting
LTE Standard Module Series
V ≥ 1.3 V
IH
Restart
Comment
Connect to ground of
(U)SIM card connector.
Either 1.8 V or 3.0 V is
supported by the module
automatically.
43 / 105