They are connected back-to-back, for different purposes. Charge control, and discharge control.
Look up the datasheet for the HY2120 protection IC used, and you will understand how they are used:
The cell voltages are sensed through the VDD and VC pins, and compared to a fixed voltage. Take a look at this block diagram which is from page 5 in the datasheet.
The length of the antenna does not affect the wavelength or frequency of the transmitted or received wave. However, an antenna of the correct length for the frequency will be more efficient at transmitting and receiving than an antenna of the wrong length.
The antenna itself does not change the wave, it just couples it into space, sometimes better and sometimes worse.
The question is how easy it is to get power into or out of an antenna of a particular length. If the antenna is too short, it is like a capacitor to the electricity, and the antenna does not radiate or receive very well. If it is too long, it ...
The wavelength is set by the frequency of the ocscillator that's driving the antenna.
The standard equation for a wave is v = fλ, where v is velocity, f is frequency and λ is wavelength.
For an electromagnetic wave, we know that v is actually the speed of light, c. So we can rearrange the equation to λ = c/f. The wavelength of the antenna doesn't come in ...
In general, solder mask should not be relied upon as insulation. So it's a bad construction even if it's not the source of your problem. A thin (maybe 0.1mm including adhesive) layer of Kapton (polyimide) tape would eliminate any possibility of shorting and would not affect it mechanically much. Your assembly house can also get die-cut Kapton stickers in ...
Is it simply a matter of "half the voltage = twice the motor inrush"
Yes it is. For a given load power, the current taken by a load in the US will be about 2.1x higher than an equivalent load in the UK.
This not only applies to continuous load current but inrush current too.
In industry, do developers generally try to simplify things ... even if it's an overkill in the sense of potentially adding more uC capability ...
Why do you care if the microprocessor is "too capable"? You care that it's capable enough, then you care about the lifetime cost of the product (to oversimplify: engineering time / number of boards + ...
Your question has been answered already by Andy aka but I saw your schematic and thought you could use a few hints.
Realize that a Common Base is a current amplifier (with a gain of <1 so not really an amplifier) OK, current buffer.
But still: current in => current out.
You're using a voltage source Vin and a resistor (voltage => current), that's OK ...
In industry, do developers generally try to simplify things by
including as many peripherals as possible in their uC selection (if
cost effective), even if it's an overkill in the sense of potentially
adding more uC capability than what may be needed?
Generally no, Like it depends on what you want to achieve. For example if someone is making large volume ...
I've been working on microcontrollers for 25 years now.
Use ARM core microcontrollers.
NXP's microcontrollers have a very few hardware bugs.
ST's microcontrollers have more bugs but are cheaper
Renesas is the best but every once in a while there's shortage.
To answer your questions:
Usually people don't pick the microcontroller that has the broadest number ...