µPD16681A
3. PIN FUNCTIONS
3.1 Power Supply System Pins
Pin Symbol
Pin Name
VDD
Logic power supply
Boost circuit power supply
VSS
Logic ground
Driver ground
VLCD
Driver power supply
VLC1-VLC5
Reference power supply
pins for driver
VLCBS1-VLCBS3 Bias value setting
C1+, C1-
C2+, C2-
C3+, C3-
Capacitor connection
Pad No.
50 to 54
55 to 59
29 to 31
14 to 28
2 to 7
32 to 49
I/O
Description
− Power supply pins for logic and boost circuit
− Ground pins for logic and driver circuit
− Power supply pins for driver. Output pin for internal boost circuit.
Connect a 1-µF capacitor between these pins and the VSS pins
for boosting.
If not using the internal boost circuit, a direct driver power supply
can be input.
− These are reference power supply pins for the LCD driver.
Leave these pins open if an internal bias has been selected.
Connect a capacitor to ground.
− When selecting an internal bias, the bias value can be changed
connecting these pins outside of the IC.
− These are capacitor connection pins for the boost circuit.
Connect a 1-µF capacitor.
Data Sheet S14207EJ3V0DS
5