Hw-044 Datasheet 'link' Jun 2026
Typically indicates that no battery is connected to the terminals, or the battery is deeply discharged/damaged. Customizing Charge Current ( RPROGcap R sub cap P cap R cap O cap G end-sub
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The is a compact RS232-to-TTL serial port converter module built around the MAX3232 integrated circuit . This module is an essential tool for projects that require communication between a computer (RS232 levels) and a microcontroller (TTL levels), such as an Arduino or ESP32. Technical Specifications
on your MCU, and vice versa. If you get no data, try swapping these two pins first. Hardware vs. Software Serial : If you are using an Arduino Uno, use the SoftwareSerial hw-044 datasheet
Based on the integrated MAX3232 transceiver datasheet provided by Texas Instruments and Analog Devices :
How does the HW-044 compare to similar modules?
#include "LedControl.h"
Cheap HW-044 modules often use "clone" MAX3232 chips which may struggle with higher baud rates or exhibit instability at exactly 3.0V. If you are planning a build, I can help you with:
| Parameter | Value | | :--- | :--- | | | HW-044 | | Primary Function | Bidirectional RS232 ⇔ TTL Level Conversion | | IC Chip | MAX3232 (most common) or MAX232 | | Operating Voltage (VCC) | 3.3V – 5V DC (for MAX3232 version) | | Operating Current | ~6 mA | | Supported Baud Rate | Up to 250 kbps (MAX3232) / 120 kbps (MAX232) | | Power Supply | External via 4-pin header (VCC, GND, TXD, RXD) | | Dimensions (PCB) | 33mm x 32mm x 16mm or 39mm x 30mm (may vary by manufacturer) | | Interface (RS232 Side) | Standard DB9 Female Connector | | Interface (TTL Side) | 4-pin header (0.1" pitch) | | ESD Protection | ±15kV (provided by the MAX3232 IC) |
Counterfeit MAX98357 chips exist on very cheap boards. They may show lower output power, noise, or shut down at high temperatures. Buy from reputable sellers. Typically indicates that no battery is connected to
The HW-044 datasheet provides a detailed pin configuration, which is essential for understanding the component's connectivity and interface requirements. The pinout is as follows:
The HW-044 is preferred over the older MAX232-based modules because it requires fewer and smaller external capacitors (usually 4 x 0.1 μF) and supports lower voltages. Pros: