Re: write the data in ram of mcu into eeprom when power outa
hi , my circuit uses the atmel 89s52 microcontroller, i am not sure but the controller will reset itself if the voltage drops below 4 volts.
so i cant use 3 volts. i can use 3 compuiter motherboard cells in series, but how ling will they last i will be drawing power only until i write a byte of data into the eeprom and the total load on battery comprises of microcontroler, serial eeprom at24c04, lcd with back light, max 232, 2 led's. but all i need is not more than a maximum of 30 seconds in the worst case.
how much does the super capacitors cost and where in india (hyderabad) can i get them , will they supply power for the above laod for a minimum of 25 sefconds.
how much does the cells in computer cost how long wil they last for the above load.
thank you
narender