Turn On/Off Scenarios; Turn On - Quectel BC66 Hardware Design

withstand 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.
NOTE
During the module's power-on or reset, an instantaneous current of 700mA will be generated for a period
of 200us. To decrease the current, it is recommended to connect a large-capacitance capacitor to VBAT. If
the load capacity of power supply is insufficient, then a 100μF tantalum capacitor is recommended.

3.7. Turn on/off Scenarios

3.7.1. Turn on

BC66 can be turned on by driving PWRKEY low for at least 500ms.
Table 9: PWRKEY Pin Definition
Pin Name Pin No.
PWRKEY 7
It is recommended use an open drain/collector driver to control the PWRKEY. A simple reference circuit is
illustrated in the following figure.
BC66_Hardware_Design
VBAT
+
C1 C2
D1
TVS
100uF 100nF
GND
Figure 5: Reference Circuit for Power Supply
Description
Pull down PWRKEY to power
up the module
Module
VBAT_RF
VBAT_BB
C3 C4
100pF 22pF
GND
PWRKEY Pull-down Time
≥500ms
NB-IoT Module Series
BC66 Hardware Design
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