User's Manual

HF-A21 Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
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1.2.6. Order Information
Base on customer detailed requirement, HF-A21 series modules provide different variants and
physical type for detailed application.
Figure 7. HF-A21 Order Information
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.