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Needlepoint Brick Covers
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cheap filpVWY flip flop shoe sale Protecting Microcontroller Input Pins from Sof

Protecting Microcontroller Input Pins from Soft Power Switch
We have the aforementioned circuit up to now, but I'm not sure if it will be reliable. I'm employing a lithiumion battery (3.74.2V) along with the TC1015 regulator (3.0V output). The thought is if the switch is pressed, the regulator activates, then a microcontroller sets uC Power high, keeping itself on. In the event the switch is pressed again, an interrupt on uC Switch will allow the microcontroller setting uC Power low, turning itself off.
What I don't know about, is if I need to protect the microcontroller from battery voltage. The microcontroller I'm using comes with a absolute maximum voltage around the I/O pins of Vdd+0.4V,
cheap filp, so I don't know purchasing that best.
Second, will this circuit actually maintain the regulator from activating if it is inside the "off" state? I had created seriously considered using a pulldown resistor around the enable line, but am focused on the existing draw even though the chip is powered on.
Edit: The microcontroller may be the primary load that is to be switched,
flip flop shoe sale, so putting it in to a low power mode unfortunately will not work here.
Edit 2 (After answers were posted):
I finished up while using the circuit below:
The new circuit runs on the flip flop, with the data line normally pulled low. Pressing the switch hits the time, turning the system on. Subsequent presses from the switch drive the time line high (allowing the microcontroller to sense the press), along with modify the production of the regulator. As soon as the microcontroller is preparing to power off, it sets the info line high after which sets the CLOCK line high, that can make the regulator to shut down.
One of the great aspects of this setup, would be that the first button press turns the regulator on, and keeps it on before microcontroller is preparing to turn off. Bounce isn't a problem, because no matter how often the hands of time line goes high, the information line is still held low through the pull down. Moreover, the existing draw ought to be low (the
flip flop as well as the TC1015 while off), and there's minimal current draw through resistors throughout.
R1 and R2 will limit the actual into pins in your uC which is usually sufficient to guard your device  you must register the spec what that "limit" current is and pick a resistor value which is appropriate given that the uC supply could be at 0V (un powered). The zeners could be omitted with this basis.
Reliability is another issue. Switch bounce could potentially cause your uC to change on then switch off a couple of times so write your code to be familiar with this.
I think it could be preferable to have a resistor on enable but probably approximately +10K and maybe this might be higher possibly 100k,
flip flop.
The voltage on the shutdown pin should be at least 45% of Vin this must not be a worry.
This seems like a self latching system, which the theory is that should work, like a self latching relay circuit would (Some control is utilized to make about the relay, then because the load pin and also the coil pin are tied together,
http://www.farfield-group.com/Flip-Flop.asp, the relay stays on provided that power goes to the stress pins).
To check it, without risking a microcontoller, this can be done. Give a dummy load to help keep the regulator happy (several leds, also to help you notice that it really is working), after which tie the output to the point where it's marked uC Power. Once you press the switch, the regulator should start, activating the leds and the uC Power, which often should keep the Enable pin at logic high (Shutdown Logic High is minimum 45% of VIN, so 1.89V at 4.2V In.).
If you press the button and the leds stay with when you release it, it truely does work. Whether or not this doesn't, it won't be is.
Warning: I believe that that, not sure what sort of Zener diodes can cause the circuit to react though.
Think about employing a latch (running on battery power) to capture the closure with the key. Then this creation of this latch might be OR'ed with a signal signal from the MCU to drive the SHDN pin from the regulator (renamed to EN from the schematic). Upon booting, the MCU should drive its enable line first, then remove the latch, thereby making sure EN stays asserted.
The following button action could be monitored through the latch: in the event the switch is pressed again, the latch goes high again. The MCU notices this and clears both latch and its particular enable signal, triggering shutdown. Considering that the switch is latched, the MCU can monitor this very conveniently through polling it at a leisurely frequency.
Another optional refinement would be a circuit to make sure that once the battery itself comes online, it powers up without having to use the button. This can be some sort of pulse which sets the latch.Related articles:

  
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