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The power-on scenario of BC68 and M66 are illustrated in the figure below.
VBAT
PWRKEY
(INPUT)
VDD_EXT
(OUTPUT)
M66
BC68
NOTES
1. Please make sure VBAT is stable before pulling down PWRKEY pin. The time of T
to be 100ms. It is not recommended to always pull down PWRKEY pin.
2. The parts marked in
3. The parts marked in
4.3. Power-off Circuit
4.3.1. Power down Module via AT Command
M66 can be turned off through AT+QPOWD command. It is a safe way to turn off the module. This
command will let the module log out from the network and allow the firmware to save important data
before completely disconnecting the power supply. For more details about the command, please refer to
document [1].
BC68 can be turned off by shutting down the VBAT power supply.
The power-down scenario is illustrated in the figure below.
BC68&M66_Compatible_Design
T
1
54ms
OFF
BOOTING
Figure 5: Timing of Power-on Scenario
green
in the above figure are for BC68.
black
in the above figure are for M66.
GSM/GPRS/NB-IoT Module Series
BC68&M66 Compatible Design
>1s
V
V
<0.1*VBAT
IL
BOOTING
> 0.6*VBAT
IH
RUNNING
is recommended
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