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PAN9520 ETU Evaluation Tool
3 PAN9520 ETU
User Guide Rev. 1.0
Page 19 of 35
Arduino
Pin
Function
PAN9520/ESP32-S2
Pin Name
PAN9520 Footprint
ESP32-S2 Footprint
0
GPIO/UART
(RX/TX: depending
on
“UART Pin Sel.”
setup)
GPIO18
(DAC_2)/GPIO17
(DAC_1)
I7/I8
24/23
3.9 Arduino Board/Shield Configuration
The ETU can be used either as Arduino board or as Arduino shield. The UART communication
and the 5
V Power input/output configuration is different between these both modes. Jumpers
on pin headers “UART Pin Sel.” and “5V Sel.” are used for configuring the desired mode.
The following figure and table shows where the pin headers are located and which jumper
settings can be used.
Configuration
UART Pin Sel.
5V Sel.
Description
Board
Ard. Pin 0: GPIO18 (U1RXD)
Ard. Pin 1: GPIO17 (U1TXD)
5V Sel: “Out”
→
no diode
Shield
Ard. Pin 0: GPIO17 (U1TXD)
Ard. Pin 1: GPIO18 (U1RXD)
5V Sel: “In”
→
protection diode in 5 V
power path