Smart Module Series
SG368Z_Series_Hardware_Design 36 / 113
3.2. Turn On
3.2.1. Turn On with PWRKEY
Table 8: Pins Description of PWRKEY
When powering up the VBAT, the module can be turned on by driving PWRKEY low for at least 200 ms. It
is recommended to use an open drain/collector driver to control the PWRKEY. PWRKEY is pulled up to
VBAT internally.
PWRKEY
＞ 200 ms
MCU
GPIO
Module
Turn on pulse
4.7K
47K
Q1
Figure 4: Reference Design of Turn On with Driving Circuit
Another way to control the PWRKEY is using a keystroke directly. When pressing the keystroke, an
electrostatic strike may be generated from finger. Therefore, you should place a TVS near the keystroke
for ESD protection. Additionally, a 1 kΩ resistor is connected in series to PWRKEY for ESD protection.
PWRKEY
Module
S1
Close to S1
TVS
1K
Turn-on pulse
R1
Figure 5: Reference Design of Turn On with Keystroke
To Next Page
Loading...
Need help?
General
