Specifications

ManualsBrandsEpson ManualsNetwork RouterSED1278F/D

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6–16 EPSON

SED1230 Series

Boosting Voltage regulat- Voltage External Boosting

circuit ing circuit follower voltage input system pin

●● ●● ●● —

× ●● ●● V

OUT OPEN

××●● V

5 = VOUT OPEN

×××

V1, V2, V3, V4, V5

OPEN

Note 1

Note 2

Note 3

SCL 1

D7 D6 D5 D4 D3 D2 D1 D0 D7

23456789

Fig. 1

Identification of data bus signals

The SED1230 series identifies data bus signals, as shown in Table 3, by combinations of A0 and WR (E).

Table 3

Chip select

The SED1230 series has a chip select pin (CS). Only when CS = “Low”, MPU interfacing is enabled.

In any status other than Chip Select, D0 to D7 and A0, WR, SI and SCL inputs are invalidated. When a serial input interface

is selected, the shift register and counter are reset.

However, the Reset signal is input regardless of the CS status.

Power Circuit

This is a low-power-consumption power circuit that generates a voltage required for liquid crystal drive.

The power circuit consists of a boosting circuit, voltage regulating circuit and voltage follower.

The power circuit incorporated in the SED1230 Series is set for a small-scale liquid crystal panel, so that its display quality

may be greatly deteriorated if it is used for a liquid crystal panel with a large display capacity.

In this case, an external power supply must be used.

A power circuit function can be selected by power control command. With this, an external power supply and a part of

the internal power supply can be used together.

Note 1: When the boosting circuit is turned off, make boosting system pins (CAP1+, CAP1-, CAP2+, CAP2-) open

and give a liquid crystal drive voltage to the VOUT pin from the outside.

Note 2: When the voltage regulating circuit is not used with the boosting circuit OFF, make the boosting system pins

open, connect between the V5 pin and VOUT pin, and give a liquid crystal drive voltage from the outside.

Note 3: When all the internal power supplies are turned off, supply liquid crystal drive voltages V

1, V2, V3, V4 and

V5 from the outside, and make the CAP1+, CAP1-, CAP2+, CAP2- and VOUT pins open.