LH1595 datasheet(11/48 Pages) SHARP

Part #	LH1595

Description	80-Segment and 17-Common Outputs LCD Driver IC with A Built-in CGROM

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Manufacturer	SHARP [Sharp Corporation]

Direct Link	http://sharp-world.com/

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LH1594/LH1595

11

2.1.4. SERIAL INTERFACE

[FOR LH1594]

The serial interface for the LH1594 is I2C BUS

format. I2C BUS is for bi-directional two-line

communication between different ICs or other

modules.

LH1594 always operates as a slave device, so

sending data of start and stop is controlled by

start/stop bits which are sent by master device.

[FOR LH1595]

The serial interface of LH1595 can accept inputs of

SDA and SCL in the chip selection state (CSB =

"L"). When not in the chip selection state, the

internal shift register and counter are reset to their

initial condition.

Serial data SDA are input sequentially in order of

D7 to D0 at the rising edge of serial clock (SCL)

and are converted into 8-bit parallel data (by serial

to parallel conversion) at the rising edge of the 8th

serial clock, being processed in accordance with

the data.

The identification whether the serial data inputs

(SDA) are display data or commands is judged by

input to RS pin.

RS = "H" : Display data

RS = "L" : Commands

After completing 8-bit data transferring, or when

making no access, be sure to set serial clock input

(SCL) to "L".

Protection of SDA and SCL signals against external

noise should be taken in actual wiring. To prevent

the successive recognition errors of transferring

data from external noise, release the chip selection

state (CSB = "H") at every completion of 8-bit data

transferring.

Valid

D0

RS

SCL

SDA

CSB

D1

D2

D3

D4

D5

D6

D7

8

7

6

5

4

3

2

1

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LH1595 Datasheet(PDF) 11 Page - Sharp Corporation

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