User's Manual

Phone: [phone] | Fax: [phone] | E-mail: [e-mail]
Address : 1879 Lundy Ave, ste. 138, San Jose, CA 95131
电话：[phone] | 传真：[phone] 转 111 | E-mail: [e-mail]
地址：天津市华苑产业区海泰西路 18 号西 3B-202（300384）
7
2.6 Pin Assignment
Name
Type
Pin #
Description
ALT Function
5V Tolerant
Initial State
UART Interface
RXD
I
13
Receive data
Y
TXD
O
14
Transmit data
Y
RTS
O
12
Request to send (active low)
Y
CTS
I
11
Clear to send (active low)
Y
Reserved
BOOT 0
I
9
Reserved
Power and Ground
V
in
8
V
in
GND
7
GND
Reset
RESETN
I
10
Reset input (active low for 5 ms);
2.5V max
LPO
LPO
I
15
Low power clock input
System CLK
SYSCLK
I
16
System clock input
Antenna
Antenna
O
18
GPS Antenna
GPIO – General Purpose Input/Output
GPIO [1]
I/O
1
General Purpose Input/Output
SPI MISO
Y
Input pull down
GPIO [2]
I/O
2
General Purpose Input/Output
SPI
MOSI/I2S_SD
Y
Floating
GPIO [3]
I/O
3
General Purpose Input/Output
SPI SCLK/
I2S_SCK
Y
Input pull down
GPIO [4]
I/O
4
General Purpose Input/Output
SPI SS/I2S_WS
Y
Input pull down
GPIO [5]
I/O
5
General Purpose Input/Output
Y
Input pull down
GPIO [6]
I/O
6
General Purpose Input/Output
ADC1
Y
Input pull down
GPIO [7]
I/O
17
General Purpose Input/Output
ADC2
Y
Input pull down