Non-volitale Memory - Electronic Circuits Projects Diagrams Free

tml1220 · 19th November 2003, 02:09 PM

I have a request for a product with non-volitale memory. The problem is every time they unplug their product they loose all of their preprogrammed setpoints. The PIC microcontroller is powered by a switching 5Volt power supply (on the board) then to a voltage regulator. If I were to put a +5 volt battery in parallel with the PIC microcontroller would that do the trick ? If so what battery would you suggest?

T

**kinjalgp** · 19th November 2003, 05:20 PM

Using a battery is not a good idea. A PIC in normal execution mode consumes not less than 5mA which means it will drain most Ni-Cd, Ni-Mh batteries in few hours. To store your program variables use I2C EEPROMs like 24Cxx (say 24C02). It will take only two I/O pins from your PIC and coding is also simple.

Other idea is to use battery while sending your PIC in "Power Down" mode when it is idle. This saves a lot of power.

Exo · 19th November 2003, 10:26 PM

Quote:

Originally Posted by tml1220

I have a request for a product with non-volitale memory. The problem is every time they unplug their product they loose all of their preprogrammed setpoints. The PIC microcontroller is powered by a switching 5Volt power supply (on the board) then to a voltage regulator. If I were to put a +5 volt battery in parallel with the PIC microcontroller would that do the trick ? If so what battery would you suggest?
T

What kind of PIC are you using? . Some pic's have EEPROM built in.

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19th November 2003, 02:09 PM	#1
tml1220	Non-volitale Memory I have a request for a product with non-volitale memory. The problem is every time they unplug their product they loose all of their preprogrammed setpoints. The PIC microcontroller is powered by a switching 5Volt power supply (on the board) then to a voltage regulator. If I were to put a +5 volt battery in parallel with the PIC microcontroller would that do the trick ? If so what battery would you suggest? T

19th November 2003, 05:20 PM	#2
kinjalgp	Using a battery is not a good idea. A PIC in normal execution mode consumes not less than 5mA which means it will drain most Ni-Cd, Ni-Mh batteries in few hours. To store your program variables use I2C EEPROMs like 24Cxx (say 24C02). It will take only two I/O pins from your PIC and coding is also simple. Other idea is to use battery while sending your PIC in "Power Down" mode when it is idle. This saves a lot of power. __________________ "There is no way to peace, peace is the way!"