Adapters; Jtag Isolator - Segger J-Link User Manual

160
8.4

Adapters

8.4.1

JTAG isolator

J-Link JTAG Isolator can be connected between J-Link and any ARM target that uses
the standard 20-pin JTAG-ARM connector to provide electrical isolation. This is essen-
tial when the development tools are not connected to the same ground as the appli-
cation. It is also useful to protect the development tools from electrical spikes that
often occur in some applications, such as motor control applications.
A 20-pin flat cable (supplied with J-Link) is needed to connect the target.
8.4.1.1 Power supply
Both sides, target and emulator, are totally isolated and separately powered. The tar-
get side draws power from pins 1 or 2, the emulator side draws power from pin 19.
Reset LED
Target
side
Power LED
J-Link / J-Trace (UM08001)
CHAPTER 8
© 2004-2009 SEGGER Microcontroller GmbH & Co. KG
Target interfaces and adapters
Emulator
Side
(J-Link)
Power LED