Specifications

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information will be remained after module reset. The module is already designed with RC reset
upon power-on.
3.
The pins for reset button and LED indication should be defined according to actual
firmware and circuit design.
4.
In default, PIN11 (GPIO14) is the module software reset PIN and will be effective with
VIH. The previous configuration information will be cleared after the module is reset (reset to
factory settings).
5.
TX and RX in UART0 are used for communication with external MCU powered by 3V.
Please refer to the description in 3.3. DC Characteristics for UART output current level.
6.
It is recommended to ground unused GPIOs with 10pF capacitor.
7.
GPIOA0 and GPIOA19 are Power on Trap Pin with functions described below:
GPIOA0
0
Normal operation mode
1
Enter into test/debug mode
GPIOA30
0
Download image from UART
1
Boot from Flash
The module will detect GPIO0 and GPIO19 when powered on and enter specific mode
according to the IO state.
4.3. PCB Antenna
Please refer to Fig 2 for PCB antenna.
Fig 2 BL1206-P Antenna layout