Product Info

Automotive Module Series
AG521R-NA QuecOpen Hardware Design
AG521R-NA_QuecOpen_Hardware_Design 41 / 104
PWRKEY
7
Turn on/off the module
V
IH
max = 1.89 V
V
IH
min = 1.17 V
V
IL
max = 0.63 V
1.8 V power domain.
Pulled-up internally.
Active low.
When the module is in power-off mode, it can be turned on by driving PWRKEY low for at least 500 ms. It is
recommended to use an open drain/collector driver to control the PWRKEY. A simple reference circuit is illustrated
in the following figure.
Turn on pulse
PWRKEY
4.7K
47K
500 ms
Figure 10: 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 the 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 11: Turn on the Module Using Keystroke
The power on scenario is illustrated in the following figure.