UPD16680 Ver la hoja de datos (PDF) - NEC => Renesas Technology

Número de pieza

componentes Descripción

Fabricante

UPD16680

1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM

NEC => Renesas Technology 

µPD16680

5. POWER CIRCUIT

The µPD16680 incorporate the booster circuit is switchable between 3 and 4 folds. The boosting magnitude of

internal booster circuit is selected by the capacitor connection.

The reference power circuit is switchable between internal driving circuit and external driving circuit. The method

for supplying the reference circuit selected by VEXT pin (H : External, L : Internal ).

5.1 Booster circuit

Using Internal driving circuit, to connect condenser for boosting between C1+ and C1–, C2+ and C2–, C3+ and C3– , to

connect condenser between VLCD and VDD to be stable boosting voltage. And to set VEXT pin to low level, internal

booster circuit boost voltage between VDD and VSS to 3 or 4 folds.

The booster circuit is using clock made by internal oscillation circuit. It is necessary that oscillation to be operated.

C1+, C1– ,C2+ ,C2– ,C3+ ,C3–, VDD are pins for booster circuit. To use the wire that have low register value to connect

these pins.

Figure 5-1 3x and 4x Booster Circuits

VLCD = 4VDD = 12 V

(4-fold boost)

VLCD = 3VDD = 9 V

(3-fold boost)

VDD = 3 V

VSS = 0 V

Remarks 1. When to use 3-fold booster circuit, not to connect condenser between C3+ and C2–, C1+ and C1–, leave

open C2+ and C3–.

2. When to use external power supply circuit, booster circuit is not operating.

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Data Sheet S12694EJ2V0DS00

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