Hw-044 Datasheet Jun 2026

) connected to Pin 2 of the TP4056 chip. The default resistor value is typically

supply rail, the core MAX3232 IC on the HW-044 features an upgraded internal capacitive charge pump. This architectural improvement lets the board operate directly from logic levels. MAX3232 RS232 to TTL Serial Port Converter Module

The TTL side of the HW-044 module features four primary pins for connecting to a microcontroller: Power supply input ( 3.3V3.3 cap V GND: Common ground.

Typical 300 µA, up to 6 mA during active use. hw-044 datasheet

For designing enclosures or PCB layouts, the HW-044 board has approximate dimensions of 33mm (Length) by 32mm (Width) by 16mm (Height). The mounting holes are designed for M3 screws.

audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DIN); audio.setVolume(21); // 0-21 audio.connecttohost("http://example.com/stream.mp3");

Here are the critical technical specifications for the HW-044 module, serving as its essential datasheet. ) connected to Pin 2 of the TP4056 chip

The HW-044 is a widely used, low-cost RS232 to TTL converter module built around the MAX3232 IC, which operates between 3.0V and 5.5V, making it compatible with 3.3V and 5V systems. As a generic module, its technical specifications generally align with the Texas Instruments MAX3232 datasheet , which supports data rates up to 250 kbit/s and includes ESD protection on the RS232 side.

The HW-044 module breaks out five signals through a standard 2.54mm (0.1”) pitch male header. From left to right, with the joystick facing up and the pins pointing down:

: To test if your HW-044 is working, short the TXD and RXD pins on the TTL side. Send a character via a terminal; if you see it echoed back, the module is functioning correctly. Troubleshooting Common Issues Garbage Characters : Usually caused by a mismatch in or a loose GND wire. No Response MAX3232 RS232 to TTL Serial Port Converter Module

The module acts as a translator. Standard RS232 signals often use -13V to +13V, which would destroy a 3.3V or 5V microcontroller. The HW-044 uses a dual charge pump to convert these to the TTL/CMOS levels your board understands.

Ensure both the microcontroller and the PC/Device are set to the same baud rate (e.g., 9600, 115200).

Connect to Arduino digital pins D2, D3, D4, D5 respectively.

Yes. Connect the VCC to the Pi's 3.3V pin, GND to GND, TXD to the Pi's RX (pin 10), and RXD to the Pi's TX (pin 8). Do not connect VCC to 5V on a Raspberry Pi.