User's Manual

HF-A21-SMT Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
11
5
UART Data Receive UART_RXD I
6
GPIO GPIO_0 I/O c
8
Ethernet Interface PHY_TX+ O Ethernet Data Interface.
9
Ethernet Interface PHY_TX- O
10
Ethernet Interface PHY_RX+ I
11
Ethernet Interface PHY_RX- I
12
USB_D+ USB_D+ I/O USB Host Port
13
USB_D- USB_D- I/O
14
WiFi status Indication nLink O “1”- WIFI connection
available,
“0”- No WIFI connection
15
Module reset signal nRST I “Low (0)” effective reset
input.
The reset duration should be
kept more than 300ms
16
Indicate the module
status of power on
process
nReady O “0” or “Palmodic Signal” -
Finish module boot up
process;
“1” - Module boot up not
finish.
17
Restore configuration nReload I Module will Restore factory
default configuration after
set this pin “0” more than 3s,
then set “1”.
This pin must 4.7K pull-up
outside the module.
19
I2C_SD I2C_SD I/O
20
I2C_SCLK I2C_SCLK O
21
UART1 Data Receive UART1_RXD I
22
UART1 Data Transmit UART1_TXD O
Note1
23
GPIO GPIO_1 I/O
25
2.4GHz Antenna ANT O 50 Ohm resistence control
7
Reserved NC NC