Yeoman CHEN
CHECKED BY
Eden LIU
DRAWN BY
TITLE
EC25
VER
DATE
10
OF
SHEET
SIZE
PROJECT
Quectel Wireless Solutions
C
A2
2016/11/11
2
B
C
D
6
5
4
3
2
1
D
C
B
A
1
2
3
4
5
6
A
MCU Interface
It is used to turn on or off the module.
It is used to reset the module.
5V power source from main board.
Notes:
1. U201 represents customer's MCU.
2. EC25 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. The VBUS pins of MCU and EC25 should be powered by
a 5V power system for USB detection, and VBUS-CTRL is used to turn on/off VBUS power supply.
3. AP_READY can be configured to high level detection and low level detection. For more details about AP_READY,
please refer to
4. Transistor circuits (Q203~Q206) are used for level translation.
Keep WAKEUP_IN_MODULE at low level
before module starts up successfully.
Reference Design
Quectel_EC25&EC21_AT_Commands_Manual.
Quectel_EC25_Hardware_Design
and
VBUS_CTRL=High level, Q207 is turned on.
AP_READY_MODULE low level detection.
G
S
D
Q206
SI2333CDS-T1
Q207
DTC043ZEBTL
R204
10K
Q202
DTC043ZEBTL
Q201
DTC043ZEBTL
Q205
2SC4617TLQ
R201
4.7K
R202
4.7K
Q203
DTC043ZEBTL
C201
470nF
R203
100K
Q204
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
U201
VDD_MCU
[4]
TXD_MCU
[4]
RXD_MCU
[1]
USB_DP
[1]
USB_DM
[1,2,10]
USB_VBUS
[2]
ON/OFF_MCU
[2]
RESET_MCU
[2]
VBUS_CTRL
[3] DC_5V
[1,2,10]
USB_VBUS
[2] VBUS_CTRL
[2]
W_DISABLE_M
[2]
SLEEP_STATUS
[1]
RESET_N
[2] RESET_MCU
[1,10]
PWRKEY
[2] ON/OFF_MCU
[4]
CTS_MCU
[4]
RTS_MCU
[3]
VBAT_EN
[1] AP_READY_MODULE
[2]
SLEEP_STATUS
VDD_EXT VDD_EXT
[1]
W_DISABLE_MODULE
[2] W_DISABLE_M
[2]WAKEUP_IN_MCU
[1]
WAKEUP_IN_MODULE
[4]
RI_MCU
[4]
DCD_MCU
[4]
DTR_MCU
[3]
CODEC_POWER_EN
[2]
WAKEUP_IN_MCU
Quectel
Confidential
