WH-BLE103 Hardware Manual
Shanghai wenheng electronic technology limited
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Figure 4 Typical connection
2.2. Power interface
Working voltage range from 1.7V to 3.6V, 3.3V is recommended. Peak current is 30mA. Pin has reserved high
frequency filter capacitance and 10uF+0.1
μ
F+1nf+100pf is recommended. If the application environment is bad,
module will often suffer ESD interference or EMC requirement is high, series connection with magnetic bead or
parallel connection with TVS is recommended to increase module stability.
When user designs the peripheral circuit for BLE103, these should be ensured: 1.Provide adequate power supply.
2.Voltage range from 1.7V to 3.6V. 3.Peak power supply voltage is less than 200mV. 4.Place large capacitance
after DC/DC or LDO to prevent external power supply voltage dropping during pulse current period.
2.3. UART interface
If module adopts 3.3V power supply and communicates to MCU with 3.3V, user just needs to connect TXD of
module to RXD of MCU and RXD of module to TXD of MCU. When communicates to MCU with unmatched
level(such as 5V), switching circuit is necessary. Switching circuit diagram as follow:
