RESET_N pin

[shridhar]

Case -1

We will see the Olimex A10 will go into faulty (or under voltage ) condition after Reaching the 3.5V,When we will give the 4.5V at the input for recovery.
Olimex required to reboot through the switch & We require to reboot the system by Grounding RESET_N pin (PIN No. 5- GPIO 3).

But, RESET_N pin (PIN No. 5- GPIO 3) voltage not reaching to 3.3V After Input voltage reached 4.5V

Request to please reply ASAP.

[LubOlimex]

What is this 4.5V? Where do you apply 4.5V exactly (which pins)? The power jack requires 5V DC.

[shridhar]

Actually when we reduce olimex input supply below upto 3.6V olimex gets OFF but when we increase input supply to 5V it doesn't get ON so we want to restart olimex board through RESET_N pin when input supply increased from 3.6V to 5V but RESET_N pin not reaching to 3.3V .

[LubOlimex]

Sorry but I don't understand neither the setup nor the problem. Please give us more details. Where is this input supply applied to the board? Is it to the power jack or to the battery connect or some pins from the headers or where exactly?

[shridhar]

Input supply applied to power jack.

[LubOlimex]

1) It is not correct to have less than 4.5V applied to the power jack. Isn't it easier to ensure that the board never gets less than 4.5V? Maybe use Li-Po battery to keep it always alive?

2) RESET_N is not the proper pin for resetting the board, it just resets the processor but many voltages remain. The proper way to reset the board is the way the on-board RESET button is routed - to PWRON pin of the AXP209, maybe if you don't have other way - use the pads of the RESET button and lead the pin to a GPIO to toggle it (aka instead of manually pressing the RESET button toggle via GPIO).

[shridhar]

Thanks