To help narrow down your specific goals with this schematic, please review the following options.
A professional debug probe must communicate with target boards operating at different voltage levels (
The board usually features multiple LDOs (Low-Dropout Regulators) to derive 3.3V and 1.8V from the 5V USB bus power. jlink v9 schematic
TCK/SWCLK and TDI are output-only signals from the debugger to the target.
Protects the MCU and matches target voltages. 2. Microcontroller Block (Atmel/Microchip SAM3U) To help narrow down your specific goals with
series termination resistors to match line impedance and prevent signal reflection. SWD/JTAG Signal Filtering
The schematic includes a sensing pin for the target reference voltage ( VTREF ). This allows the J-Link to dynamically match the logic levels of the target board, supporting voltages from 1.2V to 5V. Protects the MCU and matches target voltages
When you download a "J-Link V9 schematic," you are getting the PCB layout. To make it work, you would need to dump the firmware from a genuine J-Link. However:
Do not share vias for decoupling capacitors. Each VDD pin on the AT91SAM3U microcontroller must have its own dedicated via directly to the capacitor pad before reaching the power plane.
The schematic incorporates a P-channel MOSFET (e.g., AO3401 ) acting as a high-side switch. Controlled by the internal MCU, this switch routes 5V power to Pin 19 of the debug header when enabled via software. Detailed Pinout and Interface Connections
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