TITLE
PROJECT
Lorry XU
Woody WU
CHECKED BY
DRAWN BY
OF
A
6
5
4
3
2
1
SHEET
A
B
C
D
1
2
3
4
5
6
D
C
B
Quectel Wireless Solutions
SIZE
VER
14
4
1.0
DATE
2019/12/5
EG21-G
A2
Reference Design
5V power source from main board.
It is used to reset the module.
It is used to turn on or off the module.
MCU Interface
The USB_VBUS pins of MCU and EG21-G should be powered by a 5V power system for USB detection, and USB_VBUS_CTRL is used to turn on/off USB_VBUS power supply.
2. EG21-G can only work as a USB device and supports Full Speed and High Speed modes. To communicate with USB interface, MCU needs to support USB host or OTG function.
1. U0201 represents customers's MCU. The power domain of GPIO interfaces on EG21-G modules is 1.8V. If the domain on U0201's GPIO interfaces is the same, then the level translation circuit can be omitted.
Notes:
3. AP_READY is used to detect the MCU's sleep state. For more details, please refer to
It is used to wake up the module.
It is used to let the module enter airplane mode.
4. WAKEUP_IN_EG21-G should be kept at low level before the module starts up successfully.
Quectel_EG21-G_Hardware_Design.
G
S
D
Q0205
SI2333CDS-T1
Q0207
DTC043ZEBTL
R0204
10K
Q0202
DTC043ZEBTL
Q0201
DTC043ZEBTL
Q0206
2SC4617TLQ
R0201
4.7K
R0202
4.7K
Q0204
DTC043ZEBTL
Q0203
DTC043ZEBTL
VDD
GND
TXD
RXD
CTS
RTS
USB_VBUS
USB_D+
USB_D-
GPIO_01
GPIO_02
GPIO_03
USB_ID
GPIO_04
GPIO_05
GPIO_06
GPIO_07
GPIO_08
GPIO_09
GPIO_10
GPIO_11
GPIO_12
GPIO_13
RI
DCD
DTR
U0201
C0201
10nF
C0202
10nF
C0203
10nF
C0204
1nF
VDD_MCU
[6]
RXD
[6]
TXD
[3]
USB_DP
[3]
USB_DM
[3,4,14]
USB_VBUS
[4]
ON/OFF_MCU
[4]
RESET_MCU
[4]
VBUS_CTRL
[5,14] DC_5V
[3,4,14]
USB_VBUS
[4] VBUS_CTRL
[4]
W_DISABLE_MCU
[4]
SLEEP_STATUS
[3]
RESET_N
[4] RESET_MCU
[3,14]
PWRKEY
[4] ON/OFF_MCU
[6]
CTS
[6]
RTS
[5]
VBAT_EN
[3] AP_READY_EG21-G
[4]
SLEEP_STATUS
VDD_EXT VDD_EXT
[3]
W_DISABLE_EG21-G
[4] W_DISABLE_MCU
[5]
CODEC_POWER_EN
[3]
WAKEUP_IN_EG21-G
[4] WAKEUP_IN_MCU
[4]
WAKEUP_IN_MCU
[13]
SD_PWR_EN
[6]
DTR
[6]
RI
[6]
DCD
