Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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1. PWRKEY output voltage is 0.8 V because of the diode drop in the baseband chipset.
2. Keep all RESERVED pins and unused pins unconnected.
3. GND pins should be connected to ground in the design.
4. Pin 49 is defined as ANT_GNSS on EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX, while it is
defined as ANT_DIV on EG91-E.
5. Pin 56 is RESERVED on EG91-E, while it is defined as ANT_DIV on EG91-EX/-NA/-NAL/-NAX/
-NAXD/-NAXDL/-VX. Rx-diversity antenna is not supported on EG91-AUX.
3.3. Pin Description
The following tables show the pin definition and description of EG91 series module.
Table 3: Definition of I/O Parameters
Type Description
AI Analog Input
AO Analog Output
AIO Analog Input/Output
DI Digital Input
DO Digital Output
DIO Digital Input/Output
OD Open Drain
PI Power Input
PO Power Output
NOTE