UPD16680 datasheet(10/44 Pages) NEC

10 / 44 page

Data Sheet S12694EJ2V0DS00

µµµµPD16680

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 C

–, C

+ and C

–, C

+ and C

– , 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.

+, C

– ,C

+ ,C

– ,C

+ ,C

–, 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

VDD = 3 V

VSS = 0 V

VLCD = 3VDD = 9 V

(3-fold boost)

VLCD = 4VDD = 12 V

(4-fold boost)

Remarks 1.

When to use 3-fold booster circuit, not to connect condenser between C3

+ and C

–, C

+ and C

–, leave

open C2

+ and C

–.

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

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