A weblog focused on interesting circuits, ideas, schematics and other information about microelectronics and microcontrollers.
Nokia 1100 LCD Pic interface
Nokia 1100 display working with a PIC writen in Microchip C.
The controller is PCF8814 its is 'not' I2C. The chip is I2C capable but this LCD does not use that mode. the VDDI input can be used if the I/O levels are different than the LCD supply voltage. as per 1100's service manual, VDDI id 1.8v but the LCD supply voltage is 2.8v. in our case both the voltages are the same. The Led driver as per the manual runs with a 4.7ohm resistor at 3.6v.