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LTE Standard Module Series
EG91 Series Hardware Design
EG91_Series_Hardware_Design
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S2
RESET_N
TVS
Close to S2
Figure 15: Reference Circuit of RESET_N by Using Button
The reset scenario is illustrated in the following figure.
VBAT
RESET_N
≥ 150ms
≤ 460ms
V
IL
≤ 0.5V
V
IH
≥ 1.3V
Module
Status
Running
Resetting
Restart
Figure 16: Timing of Resetting Module
NOTES
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 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 command. For more details, please refer to
document [2].
The (U)SIM interfaces circuitry meet ETSI and IMT-2000 requirements. Both 1.8V and 3.0V (U)SIM cards
are supported.