LC75813T datasheet(20/26 Pages) ONSEMI

20 / 26 page

Figure 3

No. 7159-20/26

LC75813E, 75813T

Display and control data transfer

VDD

D1 to D87

P0 to P3

Internal data

DR, DT, FC, SC, BU

Internal data (D88 to D174)

Internal data (D175 to D261)

Notes:

≥ 0

t2 > 0

≥ 0 (t2 > t3)

tc .......10

µs min.

VLCD

Undefined

Defined

Undefined

Defined

Undefined

Defined

INH

VIL

The INH pin and Display Control

Since the IC internal data (1/3 duty: the display data D1 to D261 and the control data, 1/4 duty: the display data D1 to

D344 and the control data) is undefined when power is first applied, applications should set the INH pin low at the same

time as power is applied to turn off the display (This sets the S1/P1 to S8/P8, S9 to S86, COM1 to COM3, and

COM4/S87 to the VSS level.) and during this period send serial data from the controller. The controller should then set

the INH pin high after the data transfer has completed. This procedure prevents meaningless displays at power on. (See

Figures 3 and 4.)

Notes on the Power On/Off Sequences

Applications should observe the following sequences when turning the LC75813E and LC75813T power on and off.

• At power on: Logic block power supply (VDD) on → LCD driver block power supply (VLCD) on

• At power off: LCD driver block power supply (VLCD) off → Logic block power supply (VDD) off

However, if the logic and LCD driver block use a shared power supply, then the power supplies can be turned on and off

at the same time.

1. 1/3 duty

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