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https://e2e.ti.com/support/isolation-group/isolation/f/isolation-forum/1372709/faq-how-to-set-sinking-type-or-sourcing-type-in-iso1228
如何在 ISO1228中设置灌电流类型或拉电流类型？
灌电流类型：所有 LEDx 引脚都需要小于3V。 因此、LEDx 引脚通过 LED 连接到 GND、最大压降为3V。
供电类型：所有 LEDx 引脚都需要>3V。 因此、LEDx 引脚通过 LED 从 AVCC 连接。
