SEGGER 0.1" To 50-mil 10-Pin Patch Adapter

8.06.28
SEGGER Microcontroller GmbH
£50.26
£50.26
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Technical Overview

The SEGGER 50-Mil 10-Pin Patch Adapter bridges the gap between traditional 20-pin JTAG interfaces and modern compact 10-pin Cortex-M connectors. This professional-grade adapter serves dual purposes: standard Cortex-M connectivity and custom pin mapping for legacy or proprietary designs.

Connector Specifications

Side Connector Type Pin Count Pitch Compatible With
Input 20-pin IDC Socket 20 0.1" (2.54mm) Standard JTAG debuggers
Output 10-pin Header 10 0.05" (1.27mm) ARM Cortex-M targets

Standard Cortex-M Pinout

When used with the included ribbon cable, the adapter follows ARM's standard 10-pin Cortex-M debug connector specification:

Pin Signal Pin Signal
1 VTref 2 SWDIO/TMS
3 GND 4 SWCLK/TCK
5 GND 6 SWO/TDO
7 KEY (No pin) 8 NC/TDI
9 GND 10 nRESET
Note: Pin 7 is keyed (no physical pin) to prevent incorrect insertion of the connector.

Custom Wiring Quick-Start

For non-standard pinouts, replace the ribbon cable with individual jumper wires:

  1. Disconnect the ribbon cable from the 10-pin header side
  2. Identify target pinout from your PCB documentation
  3. Connect jumper wires between 20-pin test points and 10-pin header pins
  4. Verify connections with multimeter before powering target
Essential Connections: At minimum, connect VTref, GND, SWCLK, and SWDIO for SWD operation. Add nRESET for full debug control.

Compatible Debug Probes

This adapter works with any debug probe featuring a standard 20-pin 0.1" JTAG connector:

  • SEGGER: J-Link BASE, PLUS, PRO, ULTRA+, WiFi, Flasher series
  • STMicroelectronics: ST-LINK/V2, ST-LINK/V3SET
  • P&E Micro: Multilink Universal, Cyclone ARM
  • ARM: ULINK2, ULINKplus (with adapter)

PCB Layout Considerations

When designing PCBs for 10-pin debug connectors:

Parameter Recommendation Notes
Connector Type Samtec FTSH-105-01-L-DV Shrouded, surface mount
Keep-out Zone 3mm all sides For connector and cable clearance
Via Size 0.2mm drill min Standard PCB manufacturing
Trace Width 0.1mm minimum For high-speed signals
PCB layout example showing optimal 10-pin debug connector placement with keep-out zones

Signal Integrity Guidelines

For reliable high-speed debugging:

  • Cable Length: Keep total cable length under 30cm
  • Ground Planes: Use solid ground planes under debug traces
  • Impedance: Match 50Ω characteristic impedance for clock signals
  • Termination: Add series termination resistors if signal integrity issues occur

Troubleshooting Common Issues

Symptom Possible Cause Solution
No target detection VTref not connected Verify pin 1 connection to target VCC
Intermittent connection Poor jumper wire contact Check all jumper wire connections
High-speed programming fails Cable too long Reduce total cable length
Cannot reset target nRESET not connected Connect pin 10 to target reset

Application Examples

Space-Constrained IoT Devices

Modern IoT devices often cannot accommodate 20-pin connectors. This adapter enables the use of compact 10-pin connectors while maintaining compatibility with existing JTAG tools.

Legacy System Integration

When working with older designs that use non-standard debug pinouts, the custom wiring capability allows connection without PCB modifications.

Production Programming

In manufacturing environments, the compact connector reduces fixture complexity while maintaining programming speed and reliability.

Professional Tip: Document custom wiring configurations in your project files. Create a simple wiring diagram showing the jumper wire connections for future reference.
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