SEGGER 5V Target Supply Adapter

Product Code: 8.06.29

What it is Compact inline adapter that injects a regulated 5 V supply into the standard 20‑pin ARM/JTAG ribbon, preserving a 1:1 pass‑through for all debug signals while powering the target from pin 19. Where it fits Plugs directly between any compatible SEGGER J‑Link or Flasher and the 20‑pin ribbon cable, adding a fixed 5 V target supply without extra wiring or bench supplies. Key specifications Parameter Value Output voltage 5 V ±5 % (fixed, delivered on pin 19) Max output current Up to 500 mA (limited by host); typical J‑Link yields ≈5 V/220 mA Max capacitive load 220 µF Output ramp time 2–6 ms Connectors 20‑pin 0.1″ socket (probe side) to 20‑pin 0.1″ header (target side) Compatible hosts J‑Link BASE/PLUS/ULTRA+/PRO/PRO PoE, WiFi, and Flashers Actual available current depends on the driving probe’s power capability; a typical J‑Link providing ~4.5 V/300 mA supports about 220 mA at 5 V. Wiring quick‑start Power down the target and disconnect any existing target supply sources to avoid back‑feeding.

Insert the adapter between the J‑Link/Flasher and the 20‑pin ribbon (socket to probe, header to cable). Connect the ribbon to the target’s 20‑pin ARM/JTAG header, ensuring pin‑1 orientation. Power the J‑Link/Flasher; the adapter will ramp 5 V to the target within 2–6 ms on pin 19. Verify target current draw stays within the host’s limit (typ. ~220 mA via standard J‑Link). 20‑pin ARM/JTAG pinout (adapter preserves 1:1 signals) 1: VTref 2: GND 3: nTRST 4: GND 5: TDI 6: GND 7: TMS/SWDIO 8: GND 9: TCK/SWCLK 10: GND 11: RTCK 12: GND 13: TDO/SWO 14: GND 15: nRESET 16: GND 17: DBGRQ 18: GND 19: +5V OUT 20: GND The adapter drives +5 V on pin 19; all other pins are pass‑through for standard JTAG/SWD signalling per ARM 20‑pin assignment. Notes and cautions Do not parallel external supplies; power the target either from the adapter or an external regulator, not both. Large input capacitance above 220 µF may affect ramp behaviour or trip host limits. Output voltage can be altered by resistor changes at user risk; use SEGGER’s adjustable adapter (8.06.18) if routinely needing 0.8–3.6 V. Hero image placeholder — inline adapter between J‑Link and 20‑pin ribbon