HF-A11 Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
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1.3. Hardware Reference Design
1.3.1. Hardware
Typical Application
Figure 8.
HF-A11 Hardware Typical Application
Notes
：
nRST-
Module hardware reset signal. Input. Logics “0” effective.
There is 100K Ohm pull-up resister internal. When module power up or some issue happened,
MCU need assert nRST signal “0” at least 300ms, then set” 1” to keep module fully reset.
nReady-
Module boot up ready signal. Output. Logics “0” effective.
There is 4.7K Ohm pull-up resister internal. The module will output “0” “or “Palmodic Signal” after
normal boot up. This signal used to judge if module finish boot up and ready for application or
working at normal mode.
nLink-
Module WIFI connection indication. Output.
There is 4.7K Ohm pull-up resister internal. When module connect to AP (STA mode) or some
WiFi STA connect to module (AP mode), the module will output “0”. This signal used to judge if
module already at WiFi connection status.
nReload
- Module restore to factory default configuration.Input. Logics “0” effective.
User can assert nReload signal “0” more than 3’s through button or MCU pin, then release,
module will restore to factory default configuration and re-start boot up process. User need add
4.7K~10K Ohm pull-up resister external the module. If not use this function, then can use AT
command AT+FRLDEN=off to disable it.
UART_TXD/RXD
- UART port data transmit and receive signal.
There is 1K Ohm pull-down resister internal. User can’t add pull-up resister at these pins.
1.3.2. 10/100M
Ethernet
Interface
HF-A11 modules provide one 10/100M Ethernet PHY layer interface for data transition or user
configuration. This Ethernet support with transformer and without transformer (PHY-to-PHY) 2
kinds of connection.
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