What is it?

Cortex-M JTAG Interface Extender is great companion for firmware development, production and testing using JTAG/SWD with miniature 6-pin TagConnect2030 probes, 10-pin JTAG cables and for quick hook-ups. It connects to 20-pin IDC connector, compatible with J-Link, external genuine STLink and similar programmers.

The board contains the following target facing interfaces:

• 6-pin TagConnect2030 RJ12 interface TC2030-MCP/TC2030-MCP-NL, not found elsewhere,
• 6-pin TagConnect2030 IDC6 interface TC2030-IDC/TC2030-IDC-NL, which saves €79 for 6-pin Needle Adapter or $29.95 for TagConnect's ARM-CT,
• 10-pin JTAG interface,
• complete JTAG, SWD and Power signals on pin headers, saving up to €98 for Measurement+Patch Adapter and €49 for Target Supply Adapter.

NOTE: You can order various TagConnect cables in product options above.

Power options:

• 5V USB power with maximum 300 mA sourcing capability (indicated by yellow LED),
• pre-programmed 3.3V LDO with 300 mA current, programmable by replacing 2 resistors, indicated by green LED. Alternatively, the LDO is replaceable with fixed output version. This functionality replaces genuine Supply Adapter worth €49.

In order to use the external power with the programmer, the external power line output may need to be enabled in the programmer's user interface. Please refer to your programmer's operating manual.

Why did you make it?

We've had ARM board prototypes with very nasty hardware faults occurring, and after desperately questioning the laws of physics for a while, we needed to hook the debug signals to the scope and, at the same time, connect the debugger to TagConnect2030 (which we love and prefer to use in our designs) over RJ12. These are impossible to find in ARM Cortex-M world, so we've made one, plus some useful extras. As the board has gone through several revisions, we have decided to offer them to developers as proven and affordable solution for professional use.

What makes it special?

The latest Cortex-M JTAG Interface Extender board revision 4 integrates resistor-programmable output voltage and 10-pin JTAG. Combining relatively expensive devices into one small and compact unit, and including extra functionality, Cortex-M JTAG Interface Extender has an unbeatable price tag for both professional and hobbyist use.