Table 13 BL3383-P pin definitions
Note:
1. In default, UART2 (pin4 and pin5) are used for bypass communication and UART2 (pin6 and
pin7) are used for output of debugging information and burning firmware. Please refer to the
description in DC Characteristics for UART output current level.
2. RST is the reset pin and will be effective with VIL. Configuration information will be remained
after module reset. The module has pull-up process for RST designed internally.
3. The pins for reset button and LED indication should be defined according to actual firmware
and circuit
4. GPIO0 and GPIO1 are hardware function pins and DO NOT pull up these two pins before
power-up.
5. Pulling up both GPIO0 and GPIO3 will switch the module to firmware programming mode.
4.3 Recommendations
The following precautions should be considered during PCB designing:
Do not place any electrical components or grounding in antenna area on main board and it’s
better to leave this area blank on PCB.
It is recommended to not place any electrical components within 10mm range of module
antenna and not design any circuit or bond copper on main board under this area.
Do not use the module inside any metal case or containers with metal painting.
Keep the antenna of Wi-Fi module next to the edge of main board (as shown in Fig 5) during
design of PCB to ensure better performance of antenna.
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