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PAN9520 ETU Evaluation Tool
For ensuring that the PAN9520 boots the loaded application after powering the board, it is
recommended to connect the related pull-up resistor on GPIO0. The caption "Boot Mode" on the
PAN9520 ETU indicates the corresponding jumper placement.
If the jumper is not placed, after powering the module, the module will enter the Download Mode
and an additional reset is needed to start the device in the usual application Boot Mode.
For further information on the "strapping pins" and boot options please refer to the "PAN9520
Product Specification".
3.5 Breakout Pin Header
Every GPIO of the PAN9520 can be accessed through the breakout pin headers X18 and X19.
All signal pins are located on the center row of the three-row pin headers. The two pins next to
each signal pin are connected to 100 kΩ pull-resistors. The outer row's pins are connected to
pull-down resistors and those of the inner row are connected to pull-up resistors. In contrast, all
power signals (GND, 3.3 V, and 5 V) are connected to all three pins.
The following figure and table gives an overview about the connection between ETU, PAN9520,
and ESP32-S2.
X18
Pull-up
Signal
Pull-down
ETU Pin PAN9520/ESP32-S2
Pin Name
IO0
GPIO0
IO1
GPIO1
IO2
GPIO2
User Guide Rev. 1.0
PAN9520 Footprint
I11
B11
C11
3 PAN9520 ETU
Pull-down
Signal
Pull-up
X19
ESP32-S2 Footprint
5
6
7
Page 14 of 35
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