PD powered portable T12

The picture above shows the overall assembly effect without the shell. The overall hardware is divided into three parts: soldering tip fixing clip, OLED screen, and control motherboard. The fixing clip and the OLED screen are fixed by welding, and the motherboard and the fixing clip are plugged in.

Three key switches are integrated into the fixed clip, and a 0.87-inch OLED and a clip for fixing the soldering iron tip are integrated into the OLED screen (the clip is modified from a 5*20 fuse holder).

The control motherboard integrates a TYPE-C interface, PD deception chip (20V deception), STM32G030F6P6 main control, buzzer, thermistor, vibration switch, etc.

The MOS chip uses AO4407A, and the operational amplifier uses MCP6001 (PMOS and single-channel operational amplifiers in the same package can basically be replaced as long as the pins are the same)

The control main board is a four-layer board with a thickness of 1.6mm; the fixed plywood is a double-layer board with a thickness of 1.6mm; the OLED board is a double-layer board with a thickness of 1.2mm.

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The reason for the entire design is that it is inconvenient to use a desktop soldering iron outside. I also have a gallium nitride charging head on hand, and I was wondering if I could integrate the T12 into the handle.

The overall design is also designed according to the shape of the soldering iron handle. The screen and buttons are placed in the middle of the handle for easy operation and display.

After the hardware design was completed, I never had time to write the software. I feel that there are more pen-type portable T12 open source designs recently. I hope I can share my designs with everyone.

There are problems: 1. 3.3V is generated directly after 20V is linearly regulated (HT7533, withstand voltage 30V). It generates a lot of heat (it would be much better to use DC-DC, but it was compromised for the sake of board area). The chip itself has limited heat dissipation. It is recommended to install a heat sink.

                  2. The fixing clip and the motherboard adopt a PH2.0 plug-in design, which is slightly wobbly. There should be no problem after adding the shell.

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Please see the attachment for details of the file, which is drawn using AD. If you have any questions, please leave a message.