10 year Anniversary developpement board

Minimal custom arm m7 devloppement board designed as a 10 year anniversary present.

Selected MCU : STM32H750VBT6TR

MCU package : LQFP-100

Requirements :

• SWD debug connected with pinout compatible with native 20 pin J-Link probe

• Route all remaining mcu pins to female connectors

Schematics

Schematic : schematics

PCB

Resulting pcb, front :

back :

SWD - J-Link

SWD Connector Pinout:

The following table lists the J-Link / J-Trace SWD pinout.

Pin	Signal	Type	Description
1	VTref	Input	This is the target reference voltage. It is used to check if the target has power, to create the logic-level reference for the input comparators and to control the output logic levels to the target. It is normally fed from Vdd of the target board and must not have a series resistor.
2	Vsupply	NC	This pin is not connected in J-Link. It is reserved for compatibility with other equipment. Connect to Vdd or leave open in target system.
3	Not used	NC	This pin is not used by J-Link. If the device may also be accessed via JTAG, this pin may be connected to nTRST, otherwise leave open.
5	Not used	NC	This pin is not used by J-Link. If the device may also be accessed via JTAG, this pin may be connected to TDI, otherwise leave open.
7	SWDIO	I/O	Single bi-directional data pin.
9	SWCLK	Output	Clock signal to target CPU. It is recommended that this pin is pulled to a defined state of the target board. Typically connected to TCK of target CPU.
11	Not used	NC	This pin is not used by J-Link. This pin is not used by J-Link when operating in SWD mode. If the device may also be accessed via JTAG, this pin may be connected to RTCK, otherwise leave open.
13	SWO	Input	Serial Wire Output trace port. (Optional, not required for SWD communication.)
15	nRESET	I/O	Target CPU reset signal. Typically connected to the RESET pin of the target CPU, which is typically called "nRST", "nRESET" or "RESET". This signal is an active low signal.
17	Not used	NC	This pin is not connected in J-Link.
19	5V-Supply	Output	This pin is used to supply power to some eval boards.

Pins 4, 6, 8, 10, 12, 14, 16, 18, 20 are GND pins connected to GND in J-Link. They should also be connected to GND in the target system.

Future improvements ideas

• After adding support for USB 3.0 and up switch usb b mini for thunderbolt