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Possible Shield Requirements Analysis
06-14-2014, 12:46 AM (This post was last modified: 06-14-2014 12:50 AM by jmccartney.)
Post: #38
RE: Possible Shield Requirements Analysis
I split off all my "power supply" features into a 5cm x 5cm PCB. I did this for two reasons, I want to test these circuits out on a smaller board, and I am on the fence with integrating power into my shield or not. I might just put a header for this board if it works correctly.

5v 400mA Switching Boost Regulator
3.3v 150mA LDO Regulator
Dual N-Channel 3.0A 20V MOSFETs
N-Channel Logic Level 6.5A 30V MOSFET
Optional Li-ion/Li-Poly Charger
Optional Li Fuel Gauge

High side current sense and voltage @ pwr rail, 5v, and 3v3 via analog
Li fuel gauge measures battery voltage, charge via I2c

switch power leds and voltage reading
3 mosfet switches for pwr rail

I added a bunch of different jumpers that will allow for different power setups such as:
power regulators via lipo and pwr rail via separate battery
power only by dc barrel or usb
charge lipo by dc barrel, usb, or separate battery.

Other notes:
The diodes off of the dc barrel and usb ports are used to burn off some power to bring voltage below 5v. This is inefficiency by design because I want to keep the high efficiency boost regulator happy while maintaing the ease of non-battery power for development purposes.

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Power Management - steamboat - 05-13-2014, 05:34 PM
Servo current - steamboat - 05-30-2014, 10:11 PM
Emoro - steamboat - 06-08-2014, 07:23 AM
RE: Possible Shield Requirements Analysis - jmccartney - 06-14-2014 12:46 AM

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