ST7637 datasheet(141/210 Pages) SITRONIX

141 / 210 page

ST7637

Ver 1.6

141/210

2009/03

9.1.48. VopOfsetDec: Vop Decrease 1 (C2H)

Command

/RD

/WR

Hex

VopOfsetDec

(C2h)

NOTE: “-“ Don’t care

Description

With the VopOfsetInc and VopOfsetDec command the VLCD voltage and therewith the contrast

of the LCD can be adjusted. This command decreases the value of Vop offset register by 1.

If you set the electronic control value to 0000000, the control value is set to 1111111 after this

command has been executed.

Electronic Control Value

Decimal Equivalent

V0 Offset

0111111

+2520 mV

0111110

+2480 mV

0111101

+2440 mV

…

0000010

+80 mV

0000001

+40 mV

0000000

0 mV

1111111

-1

-40 mV

1111110

-2

-80 mV

…

1100010

-62

-2480 mV

1100001

-63

-2520 mV

1100000

-64

-2560mV

Table 9.1-1

Possible Vop[6:0] values

Restriction

Availability

Status

Availability

Normal Mode On, Idle Mode Off, Sleep Out

Yes

Normal Mode On, Idle Mode On, Sleep Out

Yes

Partial Mode On, Idle Mode Off, Sleep Out

Yes

Partial Mode On, Idle Mode On, Sleep Out

Yes

Sleep In

Yes

Default

Status

Default Value

Power On Sequence

S/W Reset

H/W Reset

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