MC14LC5003 データシートの表示（PDF） - Motorola => Freescale

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MC14LC5003

72-Segment / 128-Segment LCD Drivers CMOS

Motorola => Freescale 

FUNCTIONAL DESCRIPTION

The MC14LC5002/5003/5004 have essentially two sections

which operate asynchronously from each other; the data input

and storage section and the LCD drive section. The LCD drive

and timing is derived from the oscillator, while the data input

and storage is controlled by the Data In (Din), Data Clock

(DCLK), Address (A0, A1, A2), and Enable (ENB) pins.

Data is shifted serially into the 128-bit shift register and ar-

ranged into four consecutive blocks of 32 parallel data bits. A

time-multiplex of the four backplane drivers is made (each

backplane driver becoming active then inactive one after an-

other) and, at the start of each backplane active period, the

corresponding block of 32 bits is made available at the front-

plane drivers. A high input to a plane driver turns the driver

on, and a low input turns the driver off.

Figure 4 shows the sequence of backplanes. Figure 5 shows

the possible configurations of the frontplanes relative to the

backplanes.When a backplane driver is on, its output switches

from VLCD to 0 V, and when it is off, it switches from 1/3 VLCD

to 2/3 VLCD. When a frontplane driver is on, its

output switches from 0 V to VLCD, and when it is off, it switches

from 2/3 VLCD to 1/3 VLCD.

The LCD drive and timing section provides the multiplex sig-

nals and backplane driver input signals and formats the front-

plane and backplane waveforms.

The address pins are used to uniquely distinguish LCD driver

from any other chips on the same bus and to define LCD driver

as the “master” in the system. There must be one master in any

system.

The enable pin may be used as a third control line in the

communication bus. It may be used to define the moment

when the data is latched. If not used, then the data is latched

after 128 bits of data have been received.

TIME FRAME

BP1

BP2

BP3

BP4

Figure 4. Backplane Sequence

VLCD

2/3 (VLCD)

1/3 (VLCD)

0V

VLCD

2/3 (VLCD)

1/3 (VLCD)

0V

VLCD

2/3 (VLCD)

1/3 (VLCD)

0V

VLCD

2/3 (VLCD)

1/3 (VLCD)

0V

MOTOROLA

MC14LC5002 • MC14LC5003 • MC14LC5004

3–9

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