The 93c46 EEPROM, a common serial EEPROM chip manufactured by STMicroelectronics, finds applications in various automotive systems, including car alarm buzzers. This article addresses common challenges encountered when programming the 93C46 using a CH341A mini programmer and offers potential solutions.
Understanding the 93C46 and CH341A Setup
The 93C46 is often configured in a 128 x 8-bit organization, meaning it stores data in 128 bytes, each 8 bits wide. When the ORG (Organization) pin is tied to ground, the device operates in this standard configuration. The CH341A programmer is a widely used, low-cost tool for programming various EEPROM and flash memory chips. However, successfully programming the 93C46 with the CH341A requires careful attention to setup and software configuration.
Common Programming Issues and Troubleshooting
While reading the 93C46’s memory using the CH341A is usually straightforward, writing or programming new data can present difficulties. A common problem is the programming software hanging or freezing during the write process, indicated by a lack of progress bar movement and a continuously lit Run LED on the CH341A. This issue can stem from several factors:
1. Software and Driver Compatibility: Ensure you have installed the correct drivers for the CH341A, including both serial and parallel port drivers. Using outdated or incompatible versions of programming software, such as AsProgrammer or NeoProgrammer, can also lead to problems. Verify you’re using the latest versions and consider trying alternative CH341A programming software.
2. Hardware Connections: Double-check all connections between the 93C46 and the CH341A programmer. A continuity test can confirm proper connectivity. Pay particular attention to the CS (Chip Select) pin, as it plays a crucial role in enabling communication with the EEPROM. While some online resources suggest adding a 10k resistor between CS and ground, this is not always necessary and might not resolve the issue.
3. Power Supply: Verify the 93C46 is receiving the correct voltage. While a reading of 4.97V is close to the ideal 5V, even a slight voltage drop can sometimes interfere with programming. Ensure a stable and clean 5V power supply.
4. Blank Check and Erase: Successfully performing a blank check and erase operation confirms basic communication with the 93C46. However, it doesn’t guarantee successful programming. If the issue persists after a successful erase, the problem likely lies in the writing process itself.
Addressing the “Hanging” Write Issue
If the programming software hangs during the write operation, consider these additional steps:
- Slow Down the Programming Speed: Some CH341A software allows adjusting the programming speed. Try reducing the speed to see if it resolves the issue.
- Verify the Write Enable (WE) Pin: Ensure the WE pin on the 93C46 is properly connected and enabled for writing. Consult the 93C46 datasheet for specific WE pin requirements.
- Check for Hardware Damage: Examine the 93C46 for any visible signs of damage, such as burnt pins or cracks. A damaged chip will likely prevent successful programming. If suspicion of damage exists, replacing the 93C46 is recommended.
Conclusion
Programming the 93C46 EEPROM using a CH341A programmer can be challenging. By meticulously checking hardware connections, ensuring software compatibility, and verifying the power supply, you can significantly increase your chances of success. If problems persist, exploring advanced options like adjusting programming speed and confirming the Write Enable pin configuration might provide a solution. Remember to consult the official datasheets for both the 93C46 and the CH341A for detailed technical information.
