Tp4056 custom board can't charge

Projects General Guidance
1

tp4056 custom board can't charge, is there something wrong with this circuit even though USB can output 5V?
Resistor R8 cannot be voltage on tp4056 but its resistance value is read 1k
Read value: 0.00V → -0.01V → 0.00V (repeat)

1(1)
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Smartband
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Smartband2
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3

Schematic

smartband
smartband7643×5143 315 KB

4

At first glance i don't see anything wrong with the TP4056 connections. But the TP4056 can and should not be used in a power-share. You can charge but nothing should be connected to the battery while you do so. Isolate the battery + tp4056 from the rest of the circuit.

5

What are the values of the resistors on CC1/CC2.
Are you using a USB-C to USB-C cable?
What is the USB port connected to?

Which is the correct schematic, the one in post #1 or post #3 ?

Is the battery good?

There are no thermals on any pad that is connected to the copper pour. You may have several bad solder joints.

6

I tried to do a test for the TP4056 that was installed, there was no voltage at all on the prog resistor even though there was input. I haven't installed CC1/CC2 yet

7

Hi, @bimosora

Did you build a working prototype before designing the PCB?

Tom.... :smiley: :+1: :coffee: :australia:

8

Yes

9

I just want to know why Rprog on R8 always doesn't work even though it gets the resistor value

10

I removed the TP4056 IC first and the USB Type C Socket

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20250414_0956466648×4988 1.09 MB

11

You need those resistors or USB-C won't work.
Can you answer my other questions?

12

does that mean i have to install it for tp4056 to work?

13

If the USB does not work then nothing will work.
How about my other questions?

14

I will try the CC resistor to see if USB works or not. Right now I only have the TP4056 installed to test if it works or not. if there is any TP4056 circuit that needs to be changed, let me know

15

ok this topic is done, now i know the cc pin on usb type c must be plugged in otherwise tp4056 will not detect power

16

As I said nothing will work

Plus you have many other errors.
Good luck.

17

Well yes the using of the TP4056 with load sharing should be addressed and fixed first. If you draw current from the TP4056 / Battery while it is charging, the TP4056 can keep charging even though the LiPo is already full. This may overcharge the LiPo and as a result of that, It may explode !

18

By full, do you mean completely charged to 4.2V?

19

any other errors?

20

The ESP32 I/Os are 3.3V but you are powering the CH340 with 5V, so it's I/Os will be at 5V

21

ch340 will only be used when usb is plugged in, besides there is no 3v pin on ch340 that is plugged into esp because i plugged esp using 3v from stepdown

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