
Hardware
2016 Microchip Technology Inc.
DS50002505A-page 43
3.2.6
Fault Circuitry
In addition to the Fault signal generated by the power module, the system can also
create a DC bus overcurrent Fault.
DC Bus Overcurrent:
This Fault signal is generated when the maximum current limit
of 15A is reached. The comparison of the threshold value and the actual current is done
by comparator, U14. The threshold limit is set by R42 and R47.
3.2.7
Isolation
The power supply used by the push buttons, communication ports and the Starter Kit
on-board programmer/debugger is isolated from the power supply used by the power
module or the Microchip PIC MCU/dsPIC DSC devices. An isolated 3.3V rail is
generated from the digital 3.3V rail using a DC-to-DC Converter (U10). This converter
provides galvanic isolation, rated up to 1000 V
DC
/1 second.
3.2.8
Communication Ports
The Power Module Stage Board provides two methods for transmitting/receiving data
to and from the system. Both communication methods are powered using the isolated
3.3V rail.
UART-to-USB:
This communication port is based on a PIC18LFJ2450 device with a
serial emulator firmware. This device translates the USB signals to the Microchip
PIC MCU/dsPIC DSC UART compatible signals. Isolation for the UART-to-USB
communication port is provided by U25.
UART-to-RS-232:
This communication port is based on a RS-232 transceiver (U9).
This device translates the PIC MCU/dsPIC DSC UART signals to UART compatible
signals. Isolation for the UART-to-RS-232 communication port is provided by U25.
Shunt jumpers, J2 and J3, select the communication port.
shows the possible
configurations.
TABLE 3-3:
COMMUNICATION PORT CONFIGURATION
Note:
The comparator is open-drained and needs an external pull-up resistor.
Both the power module output and the comparator output share this pull-up
resistor, creating an OR condition at the output.
Designator
Position
Description
J2
1-2
Connects UART Receive Line to RX.
2-3
Connects USB Receive Line to RX.
J3
1-2
Connects UART Transmit Line to TX.
2-3
Connects USB Transmit Line to TX.
Содержание dsPICDEM MCHV-3
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