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User Manual for J-Link JTAG Isolator 1/4
UM08010-R3
User Manual
J-Link JTAG Isolator
Introduction
The J-Link JTAG Isolator can be connected between J-Link ARM and any ARM-
board that uses the standard 20-pin JTAG-ARM connector to provide electrical
isolation. This is essential when the development tools are not connected to
the same ground as the application. 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.
Power supply
Both sides, target and emulator, are totally isolated and separately powered.
The target side draws power from pins 1 or 2, the emulator side draws power
from pin 19.
Figure 1.
J-Link JTAG Isolator
Reset LED
Target
side
Emulator
Side
(J-Link)
Power LED
Power LED
Features
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1kV DC isolation
3.3V and 5V target operation supported
Powered from emulator and target
JTAG standard 20-pin connection supporting TRST, TDI, TMS, TCK, RTCK,
TDO and RESET signals
Power consumption on target side: < 50mA
JTAG frequency: Up to 4MHz
3 LEDs to indicate emulator power, target power and target RESET
? 2008 SEGGER Microcontroller GmbH & Co. KG
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