NB-IoT
Module Series
BC660K-GL Hardware Design
BC660K-GL_Hardware_Design 23 / 57
withstanding capability. In principle, the longer the VBAT trace is, the wider it should be. A reference
circuit for power supply is illustrated in the following figure.
VBAT
C2
C1
+
C3
C4
GND
100
μF
100 nF
100 pF 22 pF
Module
GND
D1
VBAT
TVS
Figure 5: Reference Design for Power Supply
3.5.3. Power Supply Voltage Detection
You can use
AT+CBC
to monitor and query the current VBAT voltage. The unit of the voltage value is mV
(millivolt). For detailed information about the command, see
document [2]
.
3.6. Turn-on/Turn-off Scenario
3.6.1. Turn On
After the module VBAT is powered on, keep the RESET_N and BOOT high (default), and the module will
turn on automatically. The turn-on timing is illustrated in the following figure.
VBAT
RESET_N/BOOT
˃ 500 ms
STATUS
Booting
Active
˂ 10 ms
Figure 6: Turn-on Timing
