Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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The reset scenario is illustrated in the following figure.
V
IL
≤ 0.5 V
V
IH
≥ 1.3 V
VBA T
≥ 150 ms
Resetting
Module
Status
Running
RESET_N
Restart
≤ 460 ms
Figure 16: Timing of Resetting the Module
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 Pin No. I/O Description Comment
USIM_GND 47 Specified ground for (U)SIM card
Connect to ground of
(U)SIM card connector.
USIM1_VDD 43 PO (U)SIM1 card power supply
Either 1.8 V or 3.0 V is
supported by the module
automatically.
USIM1_DATA 45 DIO (U)SIM1 card data
USIM1_CLK 46 DO (U)SIM1 card clock
NOTE