Table of Contents
Advertisement
In addition, in order to get a stable power source, it is suggested to use a TVS diode and place it as close
to the VBAT pins as possible to enhance surge protection. The following figure shows the structure of the
power supply.
VBAT
3.2. Turn On
Table 9: Pin Definition of PWRKEY
Pin Name
PWRKEY
The module can be turned on by driving the PWRKEY pin low for at least 1.6 s. PWRKEY is pulled up to
1.8 V internally.
It is recommended to use an open drain/collector driver to control PWRKEY. A simple reference circuit is
illustrated in the following figure.
SG560D_Series_Hardware_Design
+
C3
C2
D1
C1
100 μF
μF
4.7
33 pF
Figure 5: Structure of Power Supply
Pin No.
332
1.6 s
Turn on pulse
G P I O
Q1
M C U
Figure 6: Turn On the Module Using Driving Circuit
C4
C5
10 pF
100 nF
I/O
Description
DI
Turn on/off the module
4. 7K
47K
Smart Module Series
VBAT
GND
Module
PWRKEY
M odul e
48 / 134
Advertisement
Table of Contents
