Hi, I need help in my project to include one new power system for my micro2440 including a battery system. I was thinking about using PCF50633 but found difficulties in understanding its operation in the scheme of electric OpenMoko using the S3C2442. Can someone help me with this? I do not know if I was clear. ^^
You want to replace all of the on-board regulators with this device? Can YOU solder this package to a PCB? Maybe, a link to page you are looking at. I am looking at http://people.openmoko.org/tony_tu/GTA02/datasheet/PMU/PCF50633DS_02.pdf Could you be more specific as to what you don't understand?
Hi davef, i'm working with a project micro2440, but 2440 don't have a system of battery, i would like to include system of alimentation with source external and when system external out, use the battery. I found a similar system that OpenMoko project, but could not understand his schemes, I would like you to help me. And yes, i would to know if i can replace all regulators with this PCF50633. My main doubt is if I can easily replace these with componetes PCF50633, and this fits with the micro 2440. I'm making a new boardbased on micro 2440 Thx.
Hi Tiago, I would suggest to test first how long does your system run just with an external battery acting as a 5 V power supply to your board. The S3C2440 SoC has a lot of nice features which can save power even when the SoC runs under heavy load. But the Mini2440 nor the Tini2440 can use it, because they use fixed voltage regulators and cannot switch off unused external devices temporarely, becasue they are not intended for battery usage. Only with a dynamic voltage generator you can really save power. And this includes special software drivers which reduce SoC-internal clock speeds *and* the voltage at the same time on demand. Nothing else makes sense.
Have you got the skills or resources to mount this component? I had a look through the datasheet and I must say it looks like the most elaborate power management IC that I have seen. Again, a link to the project would be useful. It looks like the three switching regulators should be able to replace up to three linear regulators. I see the micro2440 has only two voltages. List all of your power supply voltages and the current required for them. Are you trying to do this to reduce power consumption by using switching regulators or ?? 3V3 at 1100mA max. From memory the mini2440 is about 50-75% of that. Are you also going to run a touchscreen? Try to answer each one of my questions or I just have to ask again or give up.
Hi, Thanks for you response,i am new on the eletronic area, but i am working with this for learn and build professional. I am doing the schemas with DipTrace. The power coming by means of a car(12v), or a truck(24v) or external battery(5,12 or 24)with conector DB9..for this I will use a 7805 voltage regulator with out 5v. 5volts will distribute these to my controller and 2 USB ports, my 7'' LCD, processor 2440, and another voltage regulator LM1117-3.3 volts for the same 7'' LCD, processor 2440, SD-Card and touch screen. I would like to use PCF50633 to manage energy supply and facilitate the system on / off the board. Do you think that will work? I do not know what the current will pass through these components, and do not know if the 7805 will endure.
post me your email to send my schematics
First problem is the maximum voltage for that part is 5V. So, no it doesn't look like a good fit your applications. I would suggest you do some research on SEPIC converters on the TI.com site. As you do not seem to be concerned about minimum power consumption then I would leave the mini2440 just as it is and power it from a 5V output SEPIC converter. Why are you using a DB9 connector for DC power? Might cause damage if someone accidentally plugs it into RS232 DB9 connector. A 7805, in the right package, might handle your 12V and 24V conditions but not your 5V condition. At 24V you might have to dissipate 15-20Watts, if you are also running the backlight. dave underscore festing at hotmail dot com
You still didn't answer my two questions!
Hey, it me again. Do you recommend any battery to use in micro 2440 with lcd 7"?
Sounds like a different application now. How long do you want it to run for? Long time - a car battery with a buck mode switcher to 5V Shorter time - 7.2V LiPo with a LDO linear regulator
I found one IC max17085 to use in my project...i will do the test and post here..to tell you if work or not..^^ ty all
Hey Davef...you know if micro2440 has any pin that make battery monitoring? Like battery low or full? thank you.
I doubt very much that there is that capability built-in. You could use one of the ADC inputs, suitably scaled and protected for that purpose. And either "cat" the value to the screen or display it in a GUI, like Qt You would need a reasonable idea of the discharge curve of your battery to make it useful.