Questions tagged [power-on-reset]

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3 votes
2 answers
233 views

Question about capacitor and resistor in "power on reset circuit"

What I am reading has this circuit: It also has this description: In analog power on reset implementation, the time and voltage threshold factors are characteristic of an analog circuit. The time ...
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1 vote
1 answer
77 views

How would I externally drive the Reset signal alongside a classic Power-On Reset circuit?

Say I have a D Flip Flop and I have a resistor, capacitor, diode, and Schmitt buffer to keep its reset line low for a few ms during startup (as per this answer) This takes care of power-on, but during ...
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  • 390
0 votes
2 answers
120 views

AVR reset pin capacitor causes chip to enter bootloader on powerup

I have a circuit using an ATmega32U4 and am using the Arduino Leonardo/Micro Caterina bootloader (the one that comes with arduinoIDE v1.8.13). The problem I am having is on power-up (via USB ...
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  • 151
1 vote
1 answer
47 views

Reset when battery powered device receives USB power

Device (microcontroller) is powered by battery or USB, through load sharing circuit. When no USB, operates on battery. When USB applied, USB powered. I want device to reset once when USB power ...
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5 votes
3 answers
181 views

Put SR latch to determined state during power on

I'm trying to build a circuit that will stay turned on once triggered, and ordinary SR latch seems like a perfect solution. However, I cannot find an efficient way to turn SR Latch to deterministic ...
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0 votes
0 answers
67 views

What does the MCP4725 Power-On-Reset (POR) value indicate?

I managed to read from an MCP4725 using I2C. In the second byte below, the POR value it gives me is '1' (the whole byte is 11000000) I know that if ...
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