NB-IoT Module Series
BC65 Hardware Design
BC65_Hardware_Design 23 / 55
It is recommended to use an open drain/collector driver circuit to control the PWRKEY. A simple reference
circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
Figure 6: Turn on the Module by Using Driver Circuit
Another way to control PWRKEY is to use a button directly. When pressing the button, electrostatic strike
may be generated from the finger. Therefore, a TVS component must be placed nearby the button for
ESD protection. A reference circuit is shown in the following figure.
PWRKEY
S1
Close to S1
TVS
Figure 7: Turn on the Module by Using Button
