ST7585 datasheet(25/51 Pages) SITRONIX

25 / 51 page

ST7585

Ver 1.0c

25/51

2009/04/14

V0a[4:0] provides an offset of V0[4:0] which is used to adjust V0 voltage to cover the process tolerance on LCD modules. It

can be adjusted by OTP command

“V0 Increase” or “V0 Decrease”.

* Typically, it is recommended to set Vop[4:0] in 8.5V ~ 9.5V (including temperature effect). So that the application

can have some range (<8.5V; >9.5V) for customer to adjust LCD contrast by themselves.

.....

a+b

Vop[4:0]

Fig 17.

Setting V0 Voltage

The default V0 voltage is shown below (V0a[4:0] is not programmed into OTP by customer):

V04

V03

V02

V01

V00

V0a[4:0]

V0 (V)

8.232

8.281

8.330

8.379

9.016

9.604

9.653

9.702

0 (default)

(without adjustment)

9.751

Please note that: V0a [4:0] is 2

’s complement, so that V0a[4:0] can increase or decrease V0. If customer adjusts V0

by too many

“V0 Increase” (or “V0 Decrease”) instructions, the purpose to increase V0 (or decrease V0) will

become:

“lower V0” (or “higher V0”).

Set Test Mode

R/W

TEN

Flag

Description

T[1:0]

Select test mode.

TEN

Enable test mode.

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