4.1.2 LCD Voltage Regulator

The device embeds an adjustable LCD voltage regulator that is managed by the SUPC.

This internal regulator is designed to supply the Segment LCD outputs. The LCD regulator output voltage is software selectable with 16 levels to adjust the display contrast (only when the internal LCD Voltage regulator is used).

If not used, its output (VDDLCD) can be bypassed (Hi-Z mode) and an external power supply can be provided onto the VDDLCD pin. In this case, VDD3V3 still needs to be supplied.

The LCD voltage regulator can be used in all power modes (Backup, Wait, Sleep and Active).

For adequate input and output power supply decoupling/bypassing, refer to LCD Voltage Regulator and LCD Output Buffers.