I want to design an OLED driver board that follows a specific signal sequence. During power-on, the order should be: VCLK first, then 1.8 V, then 5 V, and finally the reset signal. During power-off, the sequence should be the reverse: disable the reset signal first, then turn off 5 V, then 1.8 V, and finally VCLK.

 

So how are you going to tackle the project?

 

Or do you want us to design it?

 

better not... his post starts with "I want to design..."

 

Some voltage regulators have an enable pin. (shutdown, or disable, or control) This is a way to turn on/off each voltage.

 

What you are asking is not difficult but you have left a few things out.

VCLK first, then 1.8 V, then 5 V, and finally the reset signal. During power-off, the sequence should be the reverse: disable the reset signal first, then turn off 5 V, then 1.8 V, and finally VCLK.

I assume VCLK is a clock voltage? Then 1.8 V and 5 V are supply voltages? What if any is the load current? You also don't mention any delays? The word "then" does not spell out a time delay. I want to turn on VCLK and then after a 500 mS delay turn on 1.8 V and then after another 500 mS turn on ... You get the idea. You can do this using a simple uC or discrete components? What exactly would you like or want?

Ron

 

You can do this using a simple uC

Last time I did this we used a 8-pin micro. It started out as a power up sequencer, then added a fan/temperature function then I used the internal EEPROM to hide the serial number and added a "hours of use counter". We had a problem of an item sitting in storage for a year then not turning on for the first time. People want a 1-year warranty and don't like to buy a dead unit that we say is 2 years old. If it had only hours of use, they got a replacement.

 

Or do you want us to design it?

LOL,Can you?

 

LOL,Can you?

Who's project is this; yours or crutschow's?
Can you?

 

LOL,Can you?

Yes I can, with a few ICs.
But you stated "I want to design..."
So is it you or me?

 

So have you left the building?