Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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Baseband
PMIC
Transceiver
NAND
DDR2
SDRAM
PA
PAM
Switch
ANT_MAIN
VBAT_BB
VBAT_RF
PWRKEY
VDD_EXT
USB PCM UARTI2C
RESET_N
19.2M
XO
STATUS
GPIOs
Control
IQ Control
Duplexer
SAW
Tx
PRx DRx
(U)SIM2
SPI
(U)SIM1
SAW
LNA
ANT_GNSS
SAW
GPS
NETLIGHT
ANT_DIV
Figure 1: Functional Diagram
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2.4. Evaluation Board
Quectel provides a complete set of evaluation tools to facilitate the use and testing of EG91 series module.
The evaluation tool kit includes the evaluation board (UMTS&LTE EVB), a USB to RS-232 converter
cable, an earphone, antennas and other peripherals. For more details, see document [1].
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GNSS antenna is supported on EG91-AUX/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX. Rx-diversity antenna is supported
on EG91-E/-EX/-NA/-NAL/-NAX/-NAXD/-NAXDL/-VX, and is not supported on EG91-AUX.