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Low Voltage level problem in STM32 system chip

 

Dear all, hope you are doing great. I am designing a circuit using EasyEDA simulation tool. But I am facing a problem after connecting the relay to the single-Chip IC (STM32 103RTC6). The low voltage is showing around 2V, whereas it was originally supposed to be 0 volts. I am still unable to understand why it is, so I need your help, please.
 

This group is about LTspice ONLY. We can't help with EasyEDA. It may have its own support group, so look on its web site.

On 2024-10-31 14:43, noaman zahid via groups.io wrote:
Dear all, hope you are doing great. I am designing a circuit using EasyEDA simulation tool. But I am facing a problem after connecting the relay to the single-Chip IC (STM32 103RTC6). The low voltage is showing around 2V, whereas it was originally supposed to be 0 volts. I am still unable to understand why it is, so I need your help, please.
-- 
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Best Wishes
John Woodgate
Keep trying

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If a simulation shows that the low end of the relay coil has 2 V but you expected it to be 0 V, then likely causes might be:
  1. You made a mistake,
  2. The relay coil has too little resistance (draws too much amperage) for the driver IC to handle,
  3. Conversely, the driver IC wasn't made to sink as much current as the relay coil has,
  4. One or more SPICE models are incorrect.
We can't tell you what is the actual cause because we have almost no facts about your circuit.
 
Note that the driver IC can't drive its output to 0 V.  There would be some small voltage.  It might be 0.1 V or 0.6 V, for example.
 
John is correct that this is an LTspice group.  If your simulations were not done using LTspice (perhaps called by EasyEDA), then we can't help you here.
 
Andy
 
 

Dear Sir, Thank you so much for your kind suggestions. I am reconsidering my design and if i found some problem again, then i will ask you again for help. Once again bundle of thanks dear Sir. 
 

noaman,
 
You can probably answer your own question using a combination of (1) reading the datasheets, and (2) Ohm's Law.  No simulation needed.  A simple calculation reveals the answer.
 
Andy
 
 
 

Thank you, so much dear Andy, I will work on it and update you if I found any difficulty. 

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