There are 3 LCD controllers intended for character type displays (16x2 etc..) that all have differing features to suit differing kinds of project, here is a summary:
P017 - This is supplied as an IC for building into other projects it also can be supplied with a PCB making a very low cost option. It does require some building as it is supplied as a kit.
BV4619 - This is very similar to the P017 but is ready built on a PCB and has both serial and I2C interfaces. It also has a keypad interface. This costs slightly more but is a ready build solution.
BV4618 - This is a well established device that has been around for a long time. From a hardware point of view it does not handle the newer tri-colour back light displays. It uses a different serial and I2C software using VT100, the display will scroll. More comprehensive, takes more of the burden of the host.
P017 BV4619 BV4618
Interface Serial OR I2C Serial AND I2C Serial AND I2C
Electrical 3 to 5V only 3 to 5V only Can handle +&-12V RS232
Serial Type Addressable SV3 Addressable SV3 VT100
Control Basic Basic Full scrolling
Keypad Interface No Yes Yes
Surface Mount No Yes Yes
Back Light 3 x PWM 3 x PWM 1 x on/off
LCD Interface Top (18 pin) Top (18 pin) Top and Side (16 pin)
