usb-esp-programmer-isolated

Pinout — Isolated USB-C ESP Programmer (HC22003)

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Isolated target header (programmer → target):

Signal	Direction	Connect to ESP
GND (isolated)	—	target GND
VCC (isolated)	out (optional)	3V3 — only if powering the target
TX	out	target RX
RX	in	target TX
EN (RST)	out	EN / reset
IO0 (BOOT)	out	IO0 / boot strap

• Logic level: 3.3 V. Cross TX↔RX.
• The whole target side sits behind the isolation barrier — keep your target ground separate from PC/USB ground to preserve isolation.

(Isolation voltage rating and electrical limits: see the product page.)

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