Specifications

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4
GPIO13
5
GPIO15
PWM3
6
GPIO17
PWM5
7
GPIO2
RX1
PWM0
8
VDD
3.3V
9
GND
10
CHIP_EN
11
GPIO4
12
GPIO3
TX1
13
GPIO1
PWM1
I2C_SDA
14
GPIO0
I2C_SCL
15
GPIO16
16
GPIO21
RX0
17
GPIO22
TX0
18
GND
19
RTC_3V3
RTC_3V3
20
RTC_EINT
RTC_EINT
21
EXT_POW_EN
EXT_POW_EN
Note:
1. In default, UART0 is used for bypass communication and UART2 is used for output of
debugging information. Please refer to the description in DC Characteristics for UART output