The Data Gateway Interface is an interface for streaming data from the target device to a computer. This is meant as
an aid in application debugging as well as for demonstration of features in the application running on the target
device.
DGI consists of multiple channels for data streaming. The Power Debugger supports the following modes:
• USART
• SPI
• TWI
• GPIO[0..3]
All signals on the DGI header are level shifted to operate on the target device’s power domain. Also, in the signal
path are series PTC fuses,Zener overvoltage protection diodes to ground, series termination resistors, inductive
filters, and ESD protection diodes. All signal channels can be operated in the range 1.62 to 5.5V, although the Power
Debugger hardware itself can not output a higher voltage than 5.0V.
Important:
The arrows in the silk screen on the USART/SPI interface shows data directions. The arrow
pointing to the left is a receiver channel to which the target device’s TX line should be connected for
USART usage and MOSI for SPI usage. Similarly, the arrow pointing to the right is a transmitter channel
and should be connected to the target device’s RX line for USART usage and MISO for SPI usage.
Remember that for SPI usage the Power Debugger is the slave.
Important:
The DGI uses the same reference voltage as the debugger section. This means that the REF
pins of the DGI header and the debug headers are electrically connected.
Important:
SPI and USART mode cannot be used simultaneously.
Important:
An I
2
C write transaction (could be of length zero) must take place before an I
2
C read
transaction is acknowledged by the Power Debugger.
5.6
CDC Interface
The Power Debugger includes a standard CDC virtual COM port interface. The CDC header is part of the 20-pin DGI
header, although logically it is a separate interface.
Important:
The arrows on the silkscreen shows data directions. The arrow pointing to the left is a
receiver channel to which the user connects the target’s TX. Similarly, the arrow pointing to the right is a
transmitter channel to which the target device’s RX is connected.
5.7
USB Connectors
The Power Debugger contains a USB “feed-through” section across its lower side. This is a convenience feature
enabling a quick and easy connection to USB powered target boards.
The USB feed-through section has two USB connectors:
Power Debugger
Hardware Description
©
2020 Microchip Technology Inc.
User Guide
DS40002201A-page 80
