UPD16682AP datasheet(21/55 Pages) NEC

21 / 55 page

Data Sheet S14402EJ1V0DS

µµµµPD16682A

9. COMMON OUTPUT STATUS SELECT CIRCUIT

With the

µ PD16682A, the common output status select command can be used to set the scan direction for COM

outputs (see Table 9–1). As a result, there are fewer IC layout constraints when setting up the LCD module.

Table 9–1. Setting of Scan Direction for COM Outputs

Status

COM Scan Direction

Normal (forward)

COM0

→

COM63

Inverted (reverse)

COM63

→

COM0

10. POWER SUPPLY CIRCUIT

10.1 Power Supply Circuit

The power supply circuit, which supplies the voltage needed to drive the LCD, includes a booster circuit, voltage

regulator circuit, and voltage follower circuit.

The power control set command is used to control the ON/OFF status of the power supply circuit’s booster circuit,

voltage regulator circuit (V regulator circuit), and voltage follower circuit (V/F circuit). This makes it possible to jointly

use an external power supply along with certain functions of the on-chip power supply. Table 10–1 shows the

function that controls the 3-bit data in the power control set command and Table 10–2 shows a reference chart of

combinations.

Table 10–1. Control Values Set to Bits in Power Control Set Command

Status

Item

Booster circuit control bit

OFF

Voltage regulator circuit control bit

OFF

Voltage follower circuit control bit

OFF

Table 10–2. Reference Chart of Combinations

Use Status

Booster

Circuit

V Regulator

Circuit

V/F Circuit

External Power

Supply Input

Booster-

related Pin

<1> Use on-chip power supply

¡¡

VDD2

Used

<2> Use V regulator circuit

and V/F circuit only

¡¡

VLCD

Open

<3> Use V/F circuit only

××

VLC1

Open

<4> Use External power

supply only

××

VLC1 to VLC5

Open

Remarks 1. The booster-related pins are indicated as pins C1

+, C1–, C2+, C2–, C3+, and C3–.

2. Although combinations other than those shown above are possible, they have no practical uses and

therefore cannot be recommended.

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