Quote Originally Posted by mehmetOzdemir View Post
i have a battery driven circuit.

there are a 2 * 16 lcd and buttons on it.

if it is not using , i use the sleep mode for low power consumption.

until new data comes , pic is in sleep mode.

there is no problem about the pics' entering sleep mode or wake up

the problem is ; i have turn off the lcd for power consumption if pic is in sleep mode.

i have tried to enable and disable the supply of lcd.but the current of the lcd does not decrease.

i have to turn off the lcd in order to turn the circuit into low power consuption

i use 18f1320 in intrc osc 4MHZ , lcd is in 4 bits - bus mode


i will be glad to hear your ideas about this problem
mehmetOzdemir,

The LCD's power line will probably need to be switched on/off to get the LCD to totally power down. A transistor used as a switch to the 5v side would probably work ok, switching the ground side would probably not work as well since the other lines are still connected.

You could drive the transistor from a pin on the PIC to wake up when you wanted to display something. You will need to allow plenty of time for the LCD to do its startup before you get to send it data.

Just an idea,
Kevin