SuperCAP based power safe circuitry to avoid filesystem corruption on power failure
RTC with backup battery
Operating temperature: -20° - +70°
Power supply at extended range of 12V to 48V DC
Size comparison
CM3-Panel-7-Basic vs CM3-Panel-7-POE
Cm3-Panel-7-POE is an enhanced version of CM3-Panel-7-Basic. Following are the main
differences between these two products.
CM3-PANEL-U
CM3-PANEL-W
CM3-PANEL-7-POE
Raspberry Pi 3+ with 7 inch display
USB hosts
1
0
3
4
Wifi 2.4GHz
no
yes
optional
yes
Wifi 2.4/5.8GHz
no
no
optional
yes
RS485 / RS422 / RS232
no
no
yes
no
Relay
no
no
1
no
Ethernet
no
no
POE
yes
Safety power down
no
no
yes
no
RTC with backup battery
no
no
yes
Audio out
no
no
DAC Stereo 384kHz 32bit
PWM 16 bit
Power supply section
There are two ways to provide the power supply to the CM3-PANEL-7-POE.
Through the Power Over Ethernet connector (Up to 48 VDC. Mode A and Mode B are supported)
Through the separate power-in connector (from 12VDC to 48 VDC)
On board buttons
A cold reset button (P1)
A Shutdown and Restart button (P2)
Serial debug port interface
The debug port interface is used to have access to the system console at the lower level possible.
This port works starting from the very first bootstrap phase up to the Linux command line shell.
The debug port works also without active network but it needs to be activated
adding this line in /boot/config.txt file:
enable_uart=1
and adding this line in /boot/cmdline.txt file:
console=serial1,115200
The default serial speed is 115200,N,8,1. The signal levels are at 3.3 Volt.
A serial port visible as /dev/ttyAMA0 is available on the RJ45 connector described below.
The physical interface used is a Max Linear SP335 IC
that can be configured alternatively via dip-switch as:
RS232 port at ±12 volt
RS485 half duplex
RS422 full duplex
Please take care and don't plug here the Ethernet cable to avoid board damages.
GPIO Lines
Some GPIO lines are available for user purpose on two 8x2 pin headers pitch 2.54mm
On these pins are also available the power supply lines at 5VDC and 3.3VDC. The signals level
of any logic line is 3.3 volt. Don't plug boards with 5 volt line voltage to avoid damage to the
Raspberry Pi CM3 module.
Seedstudio Grove, Sparkfun QWIIC and Acme Systems A-BUS connectors
Up to three serial connection systems can be used with the CM3-Panel-7-POE. This feature
enable the use of a wide ecosystem of small modules
A Microchip ATTiny88 microprocessor is mounted on the CM3-Panel-7-POE to
monitor and manage the power supply and power safe circuitry.
This chip performs many management tasks including:
Power state monitoring
Charge state of Supercap
Raspberry wake-up after a touch event
For the first factory default firmware programming a ICSP port is available. After that
the ATTiny firmware can be changed directly by the Raspberry Pi module.
For more info please read this article:
Article under construction
USB Ports
WiFi
MicroSD socket
Raspberry Pi cam MIPI connector
Real Time Clock
Audio out interface
Video
Introduzione alla CM3-Panel 7 POE (only in Italian sorry...)
Sergio Tanzilli (definizione delle specifiche del prodotto)
hanno presentato la nuova CM3-Panel 7 POE. Il Panel PC Power Over Ethernet basato su
Raspberry Pi Compute Module 3+ disegnato per applicazioni di domotica e
automazione industriale.