The problem that the microcontroller reset circuit cannot burn the program when connected to the battery

QWE4562009

The problem that the microcontroller reset circuit cannot burn the program when connected to the battery [Copy link]

Has anyone encountered the problem that the MCU reset circuit cannot burn the program when connected to the battery? When the PCBA is connected to the battery, it cannot be burned. You must disconnect 4.2→3.3V and use the burner directly to power it before you can load the program. . . I checked the reset circuit and found a pull-up and a capacitor, and there is no problem. Could it be a problem with the reset circuit? What waveform or level should it be when burning? Reset pin

qwqwqw2088

Have you measured the VCC voltage value of the 4 wires of the microcontroller burning port when it is powered by a battery?

QWE4562009

qwqwqw2088 posted on 2021-8-18 12:48 Have you measured the VCC voltage value of the 4 wires of the microcontroller burning port when it is powered by a battery?

It is within the power supply range. The battery voltage is about 3.8V and it has LDO voltage regulation. The microcontroller operating voltage is 1.9-3.8

nllwlw

Is it possible that your power supply has raised the voltage on the programmer's side, causing the programmer to malfunction?

tagetage

Has anyone encountered the problem that the reset circuit of the microcontroller cannot burn the program when the battery is connected? ---Some types of microcontrollers have this problem. The power enters the RESET pin through R1, causing the RAM to not be cleared and burned. The battery must be disconnected to make it work.

w494143467

nllwlw posted on 2021-8-18 16:43 Is it because your power supply has raised the voltage on the programmer, causing the programmer to malfunction?

I feel this is possible!

QWE4562009

nllwlw posted on 2021-8-18 16:43 Is it because your power supply has raised the voltage on the programmer, causing the programmer to malfunction?

You said the power supply raised the reset pin? I measured it and it is within the range... 1.9-3.8, the voltage I gave is only 3.3, there is an LDO

qwqwqw2088

QWE4562009 posted on 2021-8-19 14:12 You said the power supply raised the reset pin? I measured it and it is within the range... 1.9-3.8, the voltage I gave is only 3.3, there is LDO

What type of microcontroller? The technology of some domestic manufacturers is not mature, and the reset pin may be inexplicably

qwqwqw2088

The voltage is normal, and the MCU reset circuit is suspected to be faulty.

As long as the values of the capacitor and resistor meet the reset conditions, the product of RC determines the speed of charging and discharging.

Are the capacitor and resistor values the recommended values for this microcontroller?

QWE4562009

qwqwqw2088 posted on 2021-8-19 15:25 The voltage is normal, and the reset circuit of the microcontroller is suspected to have a problem. As long as the values of the capacitor and the resistor meet the reset conditions, the product of RC determines the speed of charge and discharge...

Yes.