Is it possible to power and charge the Arduino nano battery via ICSP?

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Fire_Elemental2016-04-25 05:13:13

Arduino

Fire_Elemental, 2016-04-25 05:13:13

Some time ago I came across an article with a watch model, where the board is powered through the ICSP connector.

Then I wondered if it was possible to charge the battery using power from mini-usb and how to implement it?
Is it possible to implement this on the principle of a mobile phone, where power from an external source is spent on the operation of the device itself and at the same time battery charge?

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3 answer(s)

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Alexander Volkov, 2016-04-25
@Fire_Elemental

To simultaneously charge the battery and power the device with a stable voltage (arduino requires 5V at a frequency of 16 MHz, at a supply voltage of 3.3V at a frequency above 8 MHz)
You already need a specialized microcircuit with power management, and not a simple charge CC / CV chip.
ww1.microchip.com/downloads/en/DeviceDoc/20002090C.pdf Here is a variant of the chip that fits your application.
And then after it it is worth putting a DC / DC converter at 3.3 or 5V to power the device.

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Alexander Gusev, 2016-04-25
@Sanchogus

is it possible to charge the battery using power from mini-usb and how to implement it?

Like this is necessary?
In this case, for 18650 batteries and micro USB.
Two contacts powered by USB or other 5v, load is connected to OUT +, OUT-, to BAT +, BAT- battery.
In the presence of an external power supply from 5V, the scarf charges the battery and supplies the load at the OUT output. If there is no power, then the battery is wasted.

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evgeniy_lm, 2016-04-26
@evgeniy_lm

Can. Judging by the diagram, power from USB goes through a 6A Schottky diode
1. It must be borne in mind that the current from USB is limited to 0.5A on desktop computers, on laptops it can be significantly less.
2. Lithium batteries are very capricious; they need a charge-discharge controller, a special microcircuit. At the same time, no one forbids charge control to be implemented programmatically in the MK itself if there is one free PWM and two analog inputs, and of course, there is enough free memory.
3. You need to understand that lithium and nickel-manganese batteries have a different charge algorithm.