Specifications

EPSON 8–51
SED1240 Series
SED1240
Series
Electronic Volume RAM
The SED1240 series is provided with an electronic
volume function that permits controlling the liquid crystal
drive voltage V
5 and adjusting the density of liquid
crystal display. The electronic volume function can
select one of 32 states of the liquid crystal drive voltage
by writing 5-bit data into the electronic volume RAM.
When a V
5 voltage regulating built-in resistor is used,
this function can attain a wider adjustment if the resistor
ratio set command is used together.
The relation between electronic volume set RAM
addresses and write data is shown below.
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
T2T4 T1 T0
0
1
2
29
30
31
–
08H
09H
D7 D6 D5 D4 D3 D2 D1 D0
V
REG–31α
V REG–30α
V REG–29α
V REG–2α
V REG–α
V REG–0
V EV
: Unused
: α= V
REG /150
: Address "09H" (RE = 0) is used for test. Don't use it.
Note
α
For test
Electronic
volume
State
Electronic volume data
RAM address
[RE = 0]
Function