Figure 3-15. Voltage Monitor Circuit
PA19
VDC
3V3
1k
1%
R15
10k
1%
R19
1%
R14
470pF
C51
1k 1%
R16
GND
In case to sense VDC
voltage, select the right
value of the resistor, R14,
according to your voltage
value. And remove
resistor, R15.
The voltage monitor circuit allows the implementation of multiple applications such as:
• Detection of fault conditions
• Detection of Low-Power mode entering conditions
• Detection of wake-up situations
3.4.2
LEDs and Buttons
The PL360G55CB-EK board is equipped with several LEDs and one user push button.
3.4.2.1
User LEDs
The PL360G55CB-EK board includes two general purpose LEDs, one green connected to PA12 (LED0)
and one red connected to PA15 (LED1).
Figure 3-16. User LEDs
3V3
3V3
(LED0)
(LED1)
PA15
PA12
GREEN
D1
RED
D2
300R
R8
300R
R10
TP3
TP4
In addition, this board disposes of two green LEDs, D13 and D16, connected to 12V and 3.3V supplies
for visual status of these voltages, and a yellow LED, D104, for visual indication of PLC frames
transmission.
3.4.2.2
Push Buttons
The PL360G55CB-EK board is equipped with a momentary push button switch mounted directly to the
board. When the button is pressed it will drive the SAMG55 reset line, NRST, to GND. And PA29 will drive
the PL360 reset line, NRST_PL360, to GND.
Figure 3-17. Reset Button
GND
NRST
NRST
TP5
1
4
2
3
SW1
3.4.3
Chip Programming
The 1x2 pin-header J2 marked as “PROG” is connected to the SAMG55J19 chip input pin (PA18) and
GND. This header can be used to upgrade (using a bootloader binary file of the SAMG55J19) the PLC
stack running on the SAMG55 by the USB/serial port. See
Smart Energy: Serial Bootloader User Guide
for more information.
PL360G55CB-EK
PL360G55CB-EK Board
©
2019 Microchip Technology Inc.
User Guide
DS50002871A-page 27
