BOM-DAT/transistor-dat/S8050-dat/S8050-dat.md
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+# S8050-dat
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+## S8050 NPN Transistor Truth Table
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+
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+| Base (B) | Collector (C) | Emitter (E) | Transistor State | Collector-Emitter Current |
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+|:--------:|:-------------:|:-----------:|:----------------:|:------------------------:|
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+| LOW | HIGH | LOW | OFF (Cutoff) | 0 |
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+| HIGH | HIGH | LOW | ON (Saturation)| Flows (ON) |
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+
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+**Notes:**
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+- **Base HIGH**: A small current applied to the base (typically >0.7V above emitter) turns the transistor ON, allowing current to flow from collector to emitter.
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+- **Base LOW**: No base current keeps the transistor OFF, and no current flows from collector to emitter.
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+- **Collector is usually connected to a positive voltage, emitter to ground.**
Tech-dat/Interface-dat/Serial-dat/serial-circuits-dat/auto-serial-dat/2025-07-10-13-01-09.png
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Tech-dat/Interface-dat/Serial-dat/serial-circuits-dat/auto-serial-dat/auto-serial-dat.md
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# auto-serial-dat
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![](2023-11-30-17-20-37.png)
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- [[dual-mosfet-dat]]
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+when RTS enable, DTR == IO0, when DTR enable, RTS == EN
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+
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| DTR | RTS | EN | IO0 |
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| --- | --- | --- | --- |
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| 1 | 1 | 1 | 1 |
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| 0 | 0 | 1 | 1 |
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+| 1 | 0 | 0 | 1 |
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| 0 | 1 | 1 | 0 |
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| 1 | 1 | 1 | 1 | 1 | 1 |
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| 0 | 0 | 1 | 0 | 0 | 1 |
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| 0 | 1 | 1 | 1 | 0 | 0 |
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+| 1 | 0 | 0 | 0 | 1 | 1 |
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+
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+
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+## auto serial for [[STM32-HDK-dat]]
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+
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+![](2025-07-10-13-01-09.png)
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+
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+| DTR | Q1 | NRST | RTS | Q2 | BOOT0 |
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+| --- | --- | ---- | --- | --- | ----- |
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+| 0 | OFF | 1 | 0 | ON | 1 |
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+| 0 | OFF | 1 | 1 | OFF | 0 |
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+| 1 | ON | 0 | 0 | ON | 1 |
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+| 1 | ON | 1 | 1 | OFF | 0 |
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+
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+- [[S8050-dat]] - [[transistor-dat]]
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+
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## ref
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Tech-dat/Network-dat/RF-dat/LORA-DAT/lora-hdk-dat/lora-hdk-dat.md
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![](2025-06-23-17-59-05.png)
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+- [[auto-serial-dat]]
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+
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def in UserConfig.h
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//spi