GSM/GPRS/NB-IoT Module Series
BC68&M66 Compatible Design
BC68&M66_Compatible_Design 15 / 31
Figure 3: Reference Circuit of VBAT
4.2. Power-on Circuit
The turn-on method of BC68 is different from M66. BC68 can be powered on automatically when VBAT
pins are powered. M66 will be powered on by driving the pin PWRKEY to a low level voltage for more than
100ms, and an open collector driver circuit is suggested to control the PWRKEY. The following is a
reference design for power-on circuit of M66.
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