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Automotive Module Series
AG35 Hardware Design
AG35_Hardware_Design 44 / 129
Table 7: PWRKEY Pin Description
Pin Name
Pin No.
Description
DC Characteristics
Comment
PWRKEY
2
Turn on/off the module
V
IH
max=2.1V
V
IH
min=1.3V
V
IL
max=0.5V
The output voltage is 0.8V
because of the diode drop
in the Qualcomm chipset.
When AG35 is in power down mode, it can be turned on by driving the PWRKEY pin to a low level for at
least 500ms. It is recommended to use an open drain/collector driver to control the PWRKEY. After
STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be released. A simple
reference circuit is illustrated in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
≥ 500ms
Figure 11: Turn on the Module Using Driving Circuit
Another way to control the PWRKEY is using a button directly. When pressing the key, electrostatic strike
may generate from finger. Therefore, a TVS component is indispensable to be placed nearby the button
for ESD protection. A reference circuit is shown in the following figure.
PWRKEY
S1
Close to S1
TVS
Figure 12: Turn on the Module Using Keystroke