UM08010-R3 User Manual J-Link JTAG Isolator Introduction Power
Contents
1. target side should be lit The red LED on the target side is lit when a Target RESET is active low Preparing J Link to supply power J Link needs to supply 5V power to the emulator side of the adapter on pin 19 In order to do this you may have to configure J Link once as follows e Make sure that SEGGER J Link software is installed on your machine It can be downloaded from http www segger com download_jlink htm e Start J Link Commander which can be found under Start gt Programs gt SEGGER gt J Link ARM e Enter the following command power on perm e Plug in the adapter The LED on the emulator side should now be lit Using the Isolator with an other ARM emulator The Isolator has been designed for J Link but can also be used with other ARM emulators with the same pin out In this case you should make sure that 5V are supplied to pin 19 of the emulator connector and that your emulator is not damaged when applying 5V to this pin Do this at your own risk 2008 SEGGER Microcontroller GmbH amp Co KG User Manual for J Link JTAG Isolator 4 4 Disclaimer Specifications written in this document are believed to be accurate but are not guaranteed to be entirely free of error The information in this manual is subject to change for functional or performance improvements without notice Please make sure your manual is the latest edition While the information herein is assumed to be accurate SEGGER Microcont2. User Manual for J Link JTAG Isolator 1 4 UM08010 R3 SEGGER 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 ae eice J Link Power LED HAHH Peiidi titi tini etini iiw ikiii p 1 t i gt Features 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 lt 50mA e JTAG frequency Up to 4MHz e 3 LEDs to indicate emulator power target power and target RESET 2008 SEGGER Microcontroller GmbH amp Co KG User Manual for J Link JTAG Isolator 2 4 Connectors and indicators The Isolator uses high speed optocouplers t
3. hat allow a very low propagation time between input and output It comes with the following connectors and indicators e 20 pin female EMULATOR connector which can be plugged directly into J Link 20 pin male TARGET connector for connection of the target cable Green LED indicating power on the emulator side Green LED indicating power on the target side Red LED indicating RESET Block diagram The functional block diagram Figure 2 illustrates the functional connections between the emulator and target Figure 2 Functional block diagram 1aDeVL m lt C gt at O JJ 2008 SEGGER Microcontroller GmbH amp Co KG User Manual for J Link JTAG Isolator 3 4 Connecting the Isolator to Target and Emulator Figure 3 Connecting the Isolator to Target and Emulator Isolator vcc nTRST TDI TMS TCK RTCK TDO RESET N C N C Flat cable Isolator The Emulator side of the Isolator is plugged directly into the Emulator The Target side is connected to the target via a 20 pin flat cable Using the Isolator with J Link In order to use the Isolator follow these steps e Plug the Isolator directly into J Link e Power J Link e Make sure the green LED on the emulator side is lit If it is not follow the instruction in the next section e Connect the target via 20 pin flat cable to the target side of the Isolator If the target is powered the green LED on the
4. roller GmbH amp Co KG the manufacturer assumes no responsibility for any errors or omissions The manufacturer makes and you receive no warranties or conditions express implied statutory or in any communication with you The manufacturer specifically disclaims any implied warranty of merchantability or fitness for a particular purpose Copyright notice You may not extract portions of this manual or modify the PDF file in any way without the prior written permission of the manufacturer 2008 SEGGER Microcontroller GmbH amp Co KG Hilden Germany Trademarks Names mentioned in this manual may be trademarks of their respective companies Brand and product names are trademarks or registered trademarks of their respective holders Contact address SEGGER Microcontroller GmbH amp Co KG In den Weiden 11 D 40721 Hilden Germany Tel 49 2103 2878 0 Fax 49 2103 2878 28 Email support segger com Internet http www segger com Revisions Revision Date By Explanation 0 080104 OO Initial version 1 080109 OO Added updated picture for better understanding 2 080118 OO Updated Figure 2 Functinal block diagram 3 080827 OO Minor changes 2008 SEGGER Microcontroller GmbH amp Co KG
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