Functional Diagram - Quectel EG91 Series Hardware Design

3)
3. Within extended temperature range, the module remains the ability to establish and maintain a
voice, SMS, data transmission, emergency call*, etc. There is no unrecoverable malfunction. There
are also no effects on radio spectrum and no harm to radio network. Only one or more parameters
like P might reduce in their value and exceed the specified tolerances. When the temperature
out
returns to normal operation temperature levels, the module will meet 3GPP specifications again.
4. "*" means under development.

2.3. Functional Diagram

The following figure shows a block diagram of EG91 series module and illustrates the major functional
parts.
 Power management
 Baseband
 DDR+NAND flash
 Radio frequency
 Peripheral interfaces
VBAT_RF
VBAT_BB
PWRKEY
RESET_N
STATUS
EG91_Series_Hardware_Design
ANT_MAIN
PAM
PA
Tx
PMIC
Control
19.2M
XO
VDD_EXT
USB
LTE Standard Module Series
EG91 Series Hardware Design
ANT_DIV
ANT_GNSS 1)
SAW
Duplexer
LNA
SAW
PRx DRx
GPS
Transceiver
IQ Control
Baseband
(U)SIM1 (U)SIM2
PCM I2C
Switch
SAW
NAND
DDR2
SDRAM
SPI UART GPIOs
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