NB-IoT Module Series
BC66&BC660K-GL Compatible Design
BC66&BC660K-GL_Compatible_Design 16 / 30
or BC660K-GL. Additionally, it is recommended to add a TVS diode on the VBAT traces (near the VBAT
pins) to improve surge voltage withstand capability.
Figure 3: Compatible Reference Design for Power Supply
Depending on the type of power supply (battery or DC power supply), the reference design for power
switching circuit in the above dashed box will be different. The details are illustrated in the table below.
Table 7: Power Switching Circuit Design Based on Power Supply Type
4.2. Turn on
The methods of turning on BC66 and BC660K-GL are different:
⚫ BC66: It can be turned on by driving its PWRKEY pin low for at least 500 ms. It is recommended to
use an open drain/collector driver or a button to control the PWRKEY.
⚫ BC660K-GL: After the module VBAT is powered on, keep RESET_N and BOOT high (default), and
the module will turn on automatically.
For BC660K-GL, drive and keep the BOOT pin low during module reset or powering on, and the module
will enter the download mode. In the download mode, firmware can be downloaded through the main
UART interface. After the download is completed, the module needs to be reset to exit from this mode.
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