Turn-On And Turn-Off Timing; Turn On Module - Quectel SC606T Series Hardware Design

The following figure shows the reference design for a +5 V power supply which is regulated with an LDO
(MIC29502WU) from Microchip. The typical output volage of the LDO is 3.8 V and the rated current of it is
5.0 A.
DC_IN
C2
C1
470 μF
100 nF
NOTE
If the module happens to get into an abnormal state, it is recommended to switch off and on its power
supply to restart it.

3.5. Turn-On and Turn-Off Timing

3.5.1. Turn On Module

The PWRKEY pin is pulled up to 1.8 V internally. Driving it low for at least 1.6 s turns on the module. It is
recommended to control the pin with an open drain/collector driver. A simple reference design is shown in
the following figure.
>1.6 s
Turn on pulse
SC606T_Series_Hardware_Design
MIC29502WU
2
IN
R1
51K
Figure 5: Reference Design for Power Supply
R1
4.7K
Figure 6: Turn On Module Using Driving Circuit
SC606T Series Hardware Design
U1
4
OUT
R2
100K
1%
R4
470R
R3
47K
1%
PWRKEY
R3
1K
Q1
R2
47 K
Smart Module Series
VBAT
C3
C4
470 μF
100 nF
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