2016/5/17
Storm BAO
Tony GAO
CHECKED BY
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6
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32
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SHEET
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B
C
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123456
D
C
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Quectel Wireless Solutions
PROJECT
SIZE
TITLE
VER
42
B
DATE
Reference DesignL76 Series
A2
LDO Circuit
Customer's MCU
The transistor circuit will realize the voltage level shifting between
current from one power-on device to another power-off device.
Level Shifting for UART
5V Power Suppply and UART Circuit
VCC_MCU_5V and VCC_MODULE_3.3V, and block the leakage
1
VIN
2
GND
3
CE
5
VOUT
4
NC
U202
XC6209F332MR
+
C201
100uF
C204
100nF
C202
100nF
R204
4.7K
R203
4.7K
Q202
R205
4.7K
Q201
R202
4.7K
R207
1K
D201
C203
4.7uF
R201
4.7K
R206
10K
VCC
GND
GPIO_X
RXD
GPIO_X
TXD
GPIO_X
U201
MCU
VCC_MCU_5V
TXD_MCU
RXD_MCU
VCC_MCU_5V
RXD_MCU
VCC_MCU_5V
VCC_MODULE_3.3V
TXD1_MODULE
VCC_MODULE_3.3V
RXD1_MODULE
TXD_MCU
VCC_MCU_5V
GPIO_RESET
GPIO_STANDBY
GPS_EN
VCC_MODULE_3.3V
GPS_EN
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