TMC2209-V1.2 manual Shenzhen Biqu Technology Co., Ltd.
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voltage and the drive current can be increased.
8、Operating Mode
8.1、Pin setting of UART mode
The factory has connected the UART Pin to the fourth Pin, namely
the PDN_UART Pin shown on the left side of the figure below. If the fifth
Pin is used as the UART Pin, the resistance shall be removed and welded
to the following two pads, as shown on the right side of the figure below.
PDN is welded to select pins corresponding to UART mode；
8.2、UART mode wiring diagram
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