User's Manual

HF-A21-SMT Embedded WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
10
1.2. Hardware Introduction
1.2.1. Pins Definition
Figure 1. HF-A21-SMT Pins Map
Table 2 HF-A21-SMT Pins Definition
Pin Description Name Direction Note
3,18,24,
26
GND GND Power
1,2
VCC 3.3V Power 3.3V @ 350mA
4
UART Data Transmit UART_TXD O
Note1