Reference Documentation

Introduction to Functions

The Working Mode of USB Bridge

ESP-Prog-2 establishes a bridge between a computer and a target chip based on ESP32-S3. It can emulate a USB composite device to enable serial data transmission between the computer and the target chip through USB-to-UART bridging, or enable bidirectional JTAG communication between the computer and the target chip through JTAG bridging.

Communication Interface

Program Interface

JTAG Interface

The design for the JTAG interface on the user board should follow the reference provided in the figure below.

Fool-proof Design

The ESP-Prog-2 interfaces use boxed header connectors (DC3-6P/DC3-10P) with reverse polarity protection. It is recommended to use connectors of the same type, such as FTSH-105-01-S-DV-* or DC3-*P.

Note

Since the ribbon cables have a fixed orientation, each ESP-Prog-2 interface corresponds to a specific cable connection. Using mismatched cables may result in incorrect wiring. Therefore, please use the official ribbon cables.

LED Status Indication

When the system 3.3 V power supply is on, the red LED lights up.
When ESP-Prog-2 bridges through USB-to-UART, the green LED lights up.
When ESP-Prog-2 bridges through JTAG, the blue LED lights up.

Pin Headers

Pin Header to Select Power Supply
The labeled pins are the power input pins for each interface. When connected to 5 V, the power output of the interface is 5 V; when connected to 3.3 V, the power output of the interface is 3.3 V.
BOOT On/Off Pin
The boot mode selection pin can be used as a normal GPIO after the chip is powered on. In order to prevent ESP-Prog-2 from affecting the normal use of the BOOT pin on your board, you can manually control the BOOT signal.

For further design documentation for the board, please contact sales: sales@espressif.com.