Programming
The first part to check is the external oscillator of the IC to program. If using a crystal, use a low capacitance probe to check the clock signal is at the appropriate voltage and frequency. For crystal oscillators, any probe should be sufficient. Some devices use internal oscillators but may have a “clock out” pin that can be used to check the device is running as expected.
A common error with programming is a mismatch in working voltage levels between the programmer and the target device. Ensure the device and programmer datasheet requirements have been met.
Some devices have very specific timing requirements for voltage supplies; both the turn-on time and sequence specifications should be observed. This is particularly true of devices with many voltage banks. Failure to follow these requirements can leave the devices in an unknown state, in which they may not behave as expected.
Sometimes devices are accidentally held in reset during programming. This may be because the reset line is connected to an onboard controller or other hardware that affects the ability of the programmer to toggle the reset pin as required.
Even when programming software claims to have flashed the target successfully, there may have been undetected errors. It is useful to start with a basic firmware file to flash a GPIO or LED at a defined frequency.
Preventing Circuit Board Problems
It’s better to stop problems before they start. Good circuit board design is key. Choosing quality parts helps too. Controlling the environment where boards are used can prevent damage. Regular checks can catch issues early.
Implementing proper design for manufacturability (DFM) practices can significantly reduce the likelihood of problems during production and in the field. This includes considerations like adequate spacing between components, proper thermal management, and robust power distribution. Also, incorporating built-in test features and diagnostic capabilities can make future troubleshooting much easier.
ByteSnap works in various fields, including the energy sector, where reliable circuit boards are essential. Our experience designing for harsh environments is invaluable in creating robust, long-lasting circuit boards for critical applications.
Real-World Problem Solving
Let’s look at how ByteSnap solved a tough circuit board problem.
A client came with a board that kept failing in hot conditions. ByteSnap’s team checked the board design and found that some parts were placed too close together, causing overheating. ByteSnap redesigned the board layout, spacing out the hot components and adding better cooling. After these changes, the board worked perfectly, even in high temperatures.
In another case, ByteSnap dealt with a circuit board experiencing intermittent failures due to electromagnetic interference. We conducted thorough EMC testing to identify the source of the interference and implemented shielding techniques and filter circuits to mitigate the issue.
This not only solved the immediate problem but also improved the overall reliability of the product.
