3.4.4
Chip Erase
The 1x2 pin-header J3 marked as “ERASE” is connected to the SAMG55J19 chip erase pin (PB12) and
3.3V. This header can be used to re-initialize the Flash content (and some of its NVM bits) to an erased
state (all bits read as logic level 1) by placing a jumper on the header and pressing the reset switch
button. After a while, the erase jumper should be removed and the PCBA must be turned off and turned
on by disconnecting and connecting it again to the selected power supply. See section “ERASE Pin” in
the
SAMG55J19
datasheet for more information.
Notice:
Take into account that when Flash is erased, the bootloader application will also be
removed; therefore the SAMG55J19 device will be programmable only via JTAG.
3.5
Hardware Description – MCU Interface Ports
3.5.1
USB Device Port
The USB Device Port (UDP) is compliant with the Universal Serial Bus (USB) 2.0 full-speed device
specification. There is a USB available on the PL360G55CB-EK board that can act as both host and
device. It has a Micro-B female USB connector with the silk screen USB.
The I/O line PA11 allows the application to check if VUSBD is available.
Figure 3-18. USB Circuit
VUSBD
DUSB_N
GND
GND
DUSB_P
GND
GND
PA11
USB_DP
USB_DN
USB_Device
USB_Device
1
2
3
4
5
0
ID
D
+
D
-
+5V
G
N
D
USB2.0 MICRO-B FEMALE
J4
GND
YELLOW
D4
300R
R11
1M
R13
27k
R9
47k
R12
470R
FB3
4700pF
C50
0.1uF
C49
1
2
4
3
D3
PRTR5V0U2X
GND
Important:
Check online resources from the Microchip Website to download the drivers
according to your Operating System.
CAUTION
The USB connector is not isolated from mains. Please make use of proper isolation (i.e.: USB
isolator device) in case of using this connector when the board is not galvanically isolated (using
a PLC Coupling design which it is not isolated from mains). Take into account the possible noise
interference that these isolators could be adding to the PLC network. For instance, you can use
the
PL360G55CB-EK
PL360G55CB-EK Board
©
2019 Microchip Technology Inc.
User Guide
DS50002871A-page 28
