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PAN9520 ETU Evaluation Tool
SW1/IO0 at Start-Up
Pull-Up GPIO0
It is recommended to connect a pull-up resistor on GPIO0 by placing a jumper
on the "Boot Mode" pins. This ensures that the PAN9520 boots the loaded
application directly after powering the device. If the device is already powered
and reset, the default application Boot Mode will be also configured by an
ESP32-S2 internal pull-up resistor.
At start-up, the level on GPIO0 is evaluated for configuring the Boot Mode. If the pin's level is
high, the device will enter the usual application Boot Mode. If the pin's level is low, the device
will enter the Download Mode, which allows loading software to the PAN9520 .
Because SW1 is connected to GPIO0, the button can be used for entering this Download Mode
manually. Therefore, SW1 must be pressed while resetting the module.
IO0 is Controlled by FT2232
Usually, it is not required to set the Boot Mode manually. IO0 and RSTn are
controlled by the USB to UART0 interface of the FT2232 when downloading
software.
For further information please refer to
Specification".
3.8 Arduino Interface
The Arduino interface can be used to stack the ETU with other boards and shields with Arduino
connectors.
User Guide Rev. 1.0
3.4 Default Boot Mode
3 PAN9520 ETU
and the "PAN9520 Product
Page 17 of 35
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