Hello and welcome to another of these long lessons, with many drawings, crazy stuff
but please, if you didn't understand it, repeat the video, if you have a question you can leave it here
or on our website in the community, we'll reply to you so that you can understand all of these topics
because they're a lot, and
Probably the problem here is that you don't have the tools to practice or measure right now
but it is very important that you understand them so once you get a phone you can practice by yourself
Ok, remember this drawing? I'll erase these consumptions
and here we have two main lines, right?
these are the 2 main lines, which are V_BATT and VCC_MAIN
but, now we're going to make another drawing
we are going to draw a line from here and among these 30 components
we'll draw a line here
and this is called, who is the one being powered? PMIC is being powered
this PMIC right here, I connected my supplier
I connected the supplier and now it is on
but now my consumption is the next one
4.1 volts
and my supplier says 0.000 amps
I don't have anything, all of this
that we'll divide
this division that I'm going to do here, all these that I'm marking
up are fine
everything here is perfect, nothing failed
I don't have consumptions, but here's where it comes in
our PMIC
I'll draw the PMIC in another color
so that we can understand it better, so here my PMIC is working
Now, PMIC was powered by VCC_MAIN, as we can see over here
when the PMIC received this power, it generated a line that passed through a resistor
Right? here's an "R"
I'll do it here
and here reached, who? A power button
and this goes to Ground
this same line is communicated here
to a circuit called, I'll draw it here, called CPU
this line is called 1V8_ALWAYS
over here, this line, we'll call it HOLD_KEY, something like that was called this line
and this line also connects to this
and this one also connects to this with another pad
now we have seen this very detailed, is like this
Now
remember, everything here is powered, here's the phone ready to work
someone pressed the power button
and what it did was link this line with this one, pressed *click*
for 3 seconds
remember what happened in 3 seconds, this line came like this and now it did this
for 3 seconds
this went from 1 to 0 for 3 seconds, this is an example, it is not exactly this binary code
and then, this line here
is a Pull Up resistor, this one here
and sent the command to this, it received this that I'm marking green
it was received by both the PMIC and the CPU
my phone started working here
let me see what color we'll use now... orange
now here my phone started to work
this started to work
generated a voltage for many circuits
4, 5, 6, 7, here I'll put another one
here 8, 9 and 10, is powering many circuits, some voltages power the CPU
we could put the same interpretation here
and here we have an immense amount of parallel capacitors
sorry, let me try to draw it better
I will redraw it better so that you understand perfectly, I want to explain to you the best I can
Starting here
it powered one IC
here it powered two
here it powered three
here I'll redraw the CPU and RAM
this is the same as this one, don't get confused, this is the same CPU as above
here I'll put a connector
I'll keep drawing lines from here, I want to draw as much as I can, four
here I'll draw another, five, another one
another connector
and here another circuit
ok, I think this is enough, six, seven and eight
remember, there are 23 outputs, I just want to explain it
When it was turned on, it started to generate, what did the PMIC generate?
generated outputs called Buck and LDO
Now, look
in each of these lines is going to have, what? Capacitors, okay, I'll draw the capacitors
more and more capacitors
here I'll draw another capacitor
here it goes another
here more capacitors, etc
Why am I taking my time to do all this drawing?
is because I want you understand the consumptions, is very easy to understand but
many people get confused
So, look, here we have our Main lines, and here we have our Secondary lines
Okay, secondary lines, now let's see
My phone, I connected the battery and there's no consumption
I'll change to blue for the voltage and current
It reached the PMIC, I'll erase it and make it smaller
so here "My name is X" "My name is BuckX" "BuckX3" "BuckX4" "Buck ´´" "Buck ´´" blah blah..
ok, PMIC is there generating Buck and LDO
each of them powers their components and everything starts working
I'll take my time to draw it so you can understand
because not even Picasso would do better than I'm doing
it powered my CPU, remember the CPU has many sectors
here lines are reaching many sectors
and here it powered this connector
here it powered another, and here powered another
here another, here another
here it powered another 20 o 30, it doesn't matter, here another
let's do a variant here, how about if this voltage coming from this connector is also separated here?
and through a filter powers the RAM
but it also powers a connector, this one
well, this is my big drawing, it turned out very nice
there's no consumption, my supplier is fine
now, I press the power button here
a logical state is generated, this logical state reaches the CPU
it reaches the PMIC, and it has to turn on, how much is the consumption?
from 0.070 amps to 0.100 amps
this is the consumption on the first second, you MUST see this in your power supply
now, I pressed the power button here
and now my power supply didn't do this
instead, power supply did 0.393 amps
it didn't do 0.070 or 0.100
it did 0.393, there's a problem, and stayed fixed
this drives anyone crazy
how we're going to learn it? We'll see it on the next lesson
let's leave it as a cliffhanger, otherwise this lesson will take too long
so, for now it went to 0.393 amps, what's going on with this drawing?
we'll see it in the next lesson