EEVblog Electronics Community Forum
Electronics => Open Source Hardware => Topic started by: Md Mubdiul Hasan on September 20, 2017, 05:40:25 am
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Hello Sir,
I am getting trouble in the switching problem on my device power OFF action.
Take a look this circuit and help me.
V_BAT_OUT is 3.52 volt, VIN is nearly 4 volt.
The schematics says,
When this circuit gets power from battery V_BAT_OUT
1. PWR_KEY is High,
2. firmware check PWR_IND signal
3. PWR_KEY is pressed on few moments
4. MCU_RST pin will be LOW, that PWR_HOLD as HIGH.
but when, VIN is in action
1. PWR_KEY is LOW,
2. firmware check the PWR_IND signal
3. PWR_KEY is release on few moments
4. MCU_RST pin will be high, that PWR_HOLD as LOW.
In VIN action mode, in maximum temperature, the base of DTC304 giving Higher voltage!! :-//
Can you describe the circuit well,
Why the diode acts strange is high temperature?
How the 3 network in base of DTC304 is performing ?
Do you suggest any simulation, how could we control these MCU signal on it?
(http://)
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When you say "high/maximum temperature", what range do you mean?
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Thank you to respond in this flow.
This circuit has been tested at room temperature and for checking the performance it has taken 60 degree C that is Maximum temperature. I think diodes are reacting for leakage current and something happend for current source that raises voltage against resistors.