Bluetooth Low Energy Module
Shanghai Ehong Technologies Co., Ltd
6. Physical Interfaces
6.1. Power Supply
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The module power supply 3v coin cell batteries or DC 3.3v
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Power supply pin connection capacitor to chip and pin as far as possible close
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Capacitor decouples power to the chip
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Capacitor prevents noise coupling back to power plane.
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Figure 2
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Power Supply PCB Design
6.2. PIO
10 PIOs are provided (4 are multiplexed with SPI debug interface). They are powered
from VDD_PIO.
PIO lines are software-configurable as weak pull-up, weak pull-down, strong pull-up or
strong pull-down.
Note:
At reset all PIO lines are inputs with weak pull-downs.
Any of the PIO lines can be configured as interrupt request lines or as wake-up lines from sleep
modes.
6.3. AIO
3 AIOs are provided. They can be connected to internal 10 bits ADC. Their functions
depend on software. They can be used to read or output a voltage between 0V to 1.3V.
Each of them can be used as a digital output with special firmware.
6.4. PWM
4 PIOs (PIO3, PIO4, PIO9, and PIO10) can be driven by internal PWM module. The
PWM module also works while the module is sleep. So it can be used as a LED flasher.
These functions are controlled by special firmware.
