How to make the backlight power "ON" while the module turns ON? How to make the JUMPS, any limitations?
Fig. 1: These JUMPs below are related to the backlight control. If we want the backlight to turn "ON" while we turn ON the module, the JUMP needs to be connected to J1 and J2, leave J15 and keep J16 open. Please pay attention to the conditions of backlight, take the below as an example, if we use 5V as VDD and 3.5V for backlight, we need to calculate the value of RA to achieve the 3.5V for the backlight since we get the source from VDD (5V). Please note, if VDD is 3.3V and the backlight is 4.2V, we can't use the J1 and J2 in this situation.