Functional Diagram; Evaluation Board - Quectel EC21 Series Hardware Design

2.3. Functional Diagram

The following figure shows a block diagram of EC21 and illustrates the major functional parts.

Power management

Baseband

DDR+NAND flash

Radio frequency

Peripheral interfaces
VBAT_RF
VBAT_BB
PWRKEY
RESET_N
ADCs
STATUS

2.4. Evaluation Board

In order to help you develop applications with EC21, Quectel supplies an evaluation board (EVB), USB
data cable, earphone, antenna and other peripherals to control or test the module.
EC21_Hardware_Design
ANT_MAIN
Switch
PA
APT
Tx
PMIC
Control
19.2M
XO
VDD_EXT USB USIM PCM
Figure 1: Functional Diagram
ANT_GNSS
SAW
Duplex
LNA
PRx
Transceiver
IQ Control
Baseband
SGMII WLAN
Confidential / Released
LTE Module Series
EC21 Hardware Design
ANT_DIV
Switch
SAW
DRx
NAND
DDR2
SDRAM
GPIOs BT
I2C UART
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