PAN9520 ETU Evaluation Tool
3 PAN9520 ETU
User Guide Rev. 1.0
Page 14 of 35
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 k
Ω 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.
ETU Pin PAN9520/ESP32-S2
Pin Name
PAN9520 Footprint
ESP32-S2 Footprint
IO0
GPIO0
I11
5
IO1
GPIO1
B11
6
IO2
GPIO2
C11
7
GN
D
IO18
IO17
IO16
IO15
IO14
IO13
IO12
IO11
IO10
IO9
IO8
IO7
IO6
IO5
IO4
IO3
IO2
IO1
IO0
IO46
IO45
IO44
IO43
IO42
IO41
IO40
IO39
IO38
IO37
IO36
IO35
IO34
IO33
IO21
IO20
IO19
3.3V
5V
GN
D
Pull-down
Pull-up
Pull-down
Pull-up
Signal
Signal
X18
X19