Hello, After long search I could not find a concrete solution for battery backup, I have gone through some previous post and decided to build a battery backup solution for friendlyarm devices, I can make this product available commercially, if others are interested to buy and demand goes beyond 100 units. Please, leave you features requests, suggestions and demands. Thanks
Hi Pratik, I too am working on a battery solution for a Mini210. It will provide +5V to the Mini210 from either a battery or the external supply via a USB connection. I chose this as I can use off the shelf 1A mobile device chargers to power it. I am going to use a 4000mA battery with a Microchip power path IC that I have used in the past. This can be controlled by the Mini210 if required or will simply charge on it's own if the IO is not configured. An IC2 battery state IC will provide battery charging and discharge information. Cheers, Dave...
Hello Dave, thats good! perhaps we can work together. I am working on mini2440 and tiny210. tiny210 7inch lcd consuming battery horribly, I have used 4500mAh lead acid battery.
Hi Pratik, It would seem that the power down modes on the tiny210 and mini210 are not ideal for battery use. I don't use lead acid but instead uses LI-ION battery. You can get really nice battery charging IC's from Microchip and Texas Instruments that automatically switch the external power to the load or if no external power, switch the battery to the load. You do however need to use a buck/boost type power supply to get the 5V output from the battery's lower 3.3 to 4.2V typical output. You can control the charging cycle etc. Dave...
I can get these http://www.alibaba.com/product-gs/515511979/New_LiFePO4_PDA_battery_7_4V... And there is a great source for RC Electric plane batteries that are very impressive and under $30. I will have to find it. Like this but more storage and a charger included. http://www.horizonhobby.com/products/7-2v-2200mah-nimh-sport-power-w-tam...
@TheRegnirps. How do you plan to use those batteries with the devices? The trouble with using 7.4V batteries for the likes of the Mini210 etc is that you need a higher input voltage to charge them and you can't use a USB output to do it either. I have not been able to find a suitable power path charging IC for this voltage so you would need to design this part yourself. Correct me if I am wrong? Your idea with the charger you mention requires you to remove the battery from the circuit to charge it. Not ideal for handheld or portable devices. My design would allow the battery to remain in the system and be charged at the same time as the Mini210 is running. I use this IC from Microchip to do this. It works with a 3.6V Li-Ion battery. http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en536670 Of course you need a buck/boost power supply but those are easy to design from off the shelf IC's. The Mini210 draws approx 550 t0 620mA with the LCD and WiFi on. With the LCD off, it draws approx 350mA. It might be possible for this to be lower but I am still learning Android internals so not sure how the current system works with regards to sleep mode etc. Dave...