BC66 and that PWRKEY is not kept low all the time as otherwise the module cannot enter Deep
Sleep mode.
2. For BC660K-GL: After the module is powered off, it can be turned on again only after its VBAT
voltage drops below 0.7 V. The actual discharging time of VBAT needs to be determined based on
circuit tests and enough time margin should be left to avoid abnormal module startup. After VBAT is
powered on, RESET_N and BOOT automatically rise to high level due to internal pull-ups.
3. The red part in the above figure is for BC66.
4. The black part in the above figure is for BC660K-GL.
4.3. Turn off
The methods of turning off BC66 and BC660K-GL are also different:
⚫ BC66 can be turned off by executing AT+QPOWD=0 or by cutting off the VBAT power supply;
⚫ BC660K-GL can only be turned off by cutting off the VBAT power supply.
The turn-off timing is illustrated in the figure below.
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