Hi, I wanted to know if we can leave this SDK board ON for 24x7? I mean I want to keep this board always powered on. Any suggestions? TIA Vikas
Grade of micro2440 SDK
I would focus on the linear regulators. Leave it running for an hour to temperature stabilise and then run your lil' finger around the chips and see if any of them are hot. I would assume the ARM chip and the DM9000 could handle continuous service. Are you going to power-down the touchscreen backlighting?
hi davef, I dont want backlight continuously ON. I am putting it off using 'echo "0" /dev/backlight". I hope this is sufficient to power down touchscreen backlighting. regarding linear regulators, if they are getting hot what measures I can take? Can I add some heat sinks? TIA Vikas
Don't think heatsinks are practical. Maybe some off-board bigger linear regulators. Can you hold your finger on the linear regulators? To reduce power loss in the linear regulators you could replace them with little switching regulators (SMPS). I think the only thing that has 5Volts on it is the touchscreen. Perhaps, you could turn that off as well as the back lighting. Can your plug-pak handle 24+7? My micro2440 SDK schematics don't show any touchscreen. My mini2440 says VDDLCD goes to the LCD but doesn't say where is comes from. The datasheet says my 3.5" needs 5v.
hmm. its a good option for off-board regulators. regarding 5 volts I think USB devices also needs 5 volts. I was thinking to design a separate board for these SMPS regulators but then dont know if i will be able to do something with the connector used for LCD cable. I am not sure if anybody will be able to solder those connectors on the board here. Regarding plug-pak I am in a process of designing my own with battery back-up. Will check charging level of battery on some serial port then disconnect the AC power input for some time in a day e.g. 1 hour after every 4 hours we can disconnect AC mains power. regarding VDDLCD i think relay is the only option. but adjusting that relay between the cable or cable and connectors is a tough job (at least for me).
sorry dave, I hvnt replied yet on your holding the finger over linear regulator. I am in office. Will check that after going home. My office work is different. micro2440 related work is my hobby.