Do your own PCB, with stm32f401ccu6 chip, written in keil burn program prompt no target connected, check the chip power supply pin voltage is 3.3 v is normal, chip burn after electricity bit, welding is looking for the generation of welding professionals should have no problem, don't know if principle chart

CodePudding user response:

Should not be hot, hot, current is too big, should be there is something wrong with the connection or welding

CodePudding user response:

reference 1/f, worldy response:

should not be hot, hot, current is too big, should be there is something wrong with the connection or welding

There is something wrong with the schematic diagram, checked all the welding should be no problem

CodePudding user response:

General MCU is burned

CodePudding user response:

Schematic diagram looks without what big question, check whether the voltage of each foot in the normal range, especially the Vdd, Vdda feet

CodePudding user response:

Multimeter current file, concatenated, check what is the total current, if the current is measured before 12 v, current will be reduced to 3 v

CodePudding user response:

B1, b2 encapsulation, here see if, inside out,

CodePudding user response:

U2 components here whether to use ADJ regulating, or with fixed voltage output, here also pay attention to the next

CodePudding user response:

refer to 7th floor weixin_46666236 response:

element U2 here whether to use ADJ regulating, or a fixed voltage output, here also should pay attention to the

B1b2 checked, no problem, u2 is am1117-3.3, examined several filter capacitor voltage, is 3.297 v should be no problem, I will buy u2 output voltage of receiving the minimum system can work and burning process

CodePudding user response:

reference 4 floor worldy response:

principle diagram looks without what big question, check whether the voltage of each foot in the normal range, especially the Vdd, Vdda feet

Measurement, the voltage is normal 3.297 v but chip will be hot after the power supply

CodePudding user response:

Should be MCU is broken, when we have time I meet a peripheral peripherals short-circuit leads to burn MCU is broken, touched the MCU is very hot,

CodePudding user response:

references to the tenth floor m0_46195580 response:

should be MCU is broken, there are times when I connect peripherals, peripheral circuit to burn MCU is broken, touched the MCU is very hot,

My chip, also is not very hot, a little hot, also may be bad

CodePudding user response:

11 references oDianNaoBingDu response:

Quote: reference to the tenth floor m0_46195580 response:

should be MCU is broken, there are times when I connect peripherals peripherals short-circuit leads to burn MCU is broken, touched the MCU is very hot,

My chip, also is not very hot, a little hot, also may be bad yet

Possible, I look at your circuit diagram ch340 power supply is 12 v, I remember is 3-5 v, there are so high

CodePudding user response:

You can put the received 20th pin on the single-chip microcomputer, the line cut off, the 20th pin is BOOT1, you the circuit diagram of this has been received driceB, it may cause burning question, you can switch off,

CodePudding user response:

reference 13 floor weixin_46666236 reply:

you can put the received 20th pin on the single-chip microcomputer, the line cut off, the 20th pin is BOOT1, you the circuit diagram of this has been received driceB, it may cause burning question, you can switch off,

Driveb there is no welding all pin20 nothing now

CodePudding user response:

On the 14th floor oDianNaoBingDu

reference response:

Quote: refer to the 13th floor weixin_46666236 response:

you can put the received 20th pin on the single-chip microcomputer, the line cut off, the 20th pin is BOOT1, you the circuit diagram of this has been received driceB, it may cause burning question, you can switch off,

Driveb there is no welding all pin20 nothing now

On the 14th floor oDianNaoBingDu

reference response:

Quote: refer to the 13th floor weixin_46666236 response:

you can put the received 20th pin on the single-chip microcomputer, the line cut off, the 20th pin is BOOT1, you the circuit diagram of this has been received driceB, it may cause burning question, you can switch off,

Driveb there is no welding all pin20 nothing now

At the bottom of the L2 connected directly here, L2 resistance has a direct connection.

CodePudding user response:

To screen the current flow in from there, please measure the AMS1117 have 3.3 V output flow of current

CodePudding user response:

reference 16 floor xiazai562644322 response:

to screen the current flow in from there, please measure the AMS1117 have 3.3 V output flow current

I use electric meter measuring, found is ams1117 output and short circuit, then test the other ams1117 chip found no electricity output, and the earth is short of, don't I bought a bunch of fake chips

CodePudding user response:

Plus external power source, your own power supply circuit, only to the CPU power supply, can download not, if the short circuit, in a word, break