FEDL9042-01
OKI Semiconductor
ML9042-xx
Symbol
ROM1S
Description
The input pin to switch the ROM bank. “H” selects ROM1 and “L” selects ROM0.
Switching after power-on is prohibited.
The pins to output bias voltages to the LCD.
For 1/4 bias : The V
2
and V
3B
pins are shorted.
For 1/5 bias : The V
3A
and V
3B
pins are shorted.
The input pin to enable or disable the voltage multiplier circuit.
"L" disables the voltage multiplier circuit. "H" enables the voltage multiplier circuit.
The voltage multiplier circuit doubles the input voltage between the V
IN
pin and the
GND pin, and the multiplied voltage referenced to the GND is output to the V
OUT
pin.
The voltage multiplier circuit can be used only when generating a level higher than the
V
DD
.
The input pin for test circuits. Normally connect this pin to V
DD
.
The output pin for the test circuits. Normally leave this pin open.
The pin to input voltage to the voltage multiplier.
The pins to supply the LCD drive voltage.
The same potential as the V
DD
potential is supplied to the V
OUT
and V
0
pins when the
voltage multiplier is not used (BE = “0” or BE = “1”, and the capacitor is not connected
to the V
C
and V
CC
pins)
When the voltage multiplier is used (BE = “1”), the multiplied voltage is output to the
V
OUT
pin, so that the V
OUT
pin and V
0
pin should be connected.
Capacitors for the voltage multiplier should be connected between the GND and the
V
OUT
pin.
V
1
, V
2
, V
3A
, V
3B
, V
4
BE
TEST
IN
TEST
OUT
V
IN
V
0
, V
OUT
V
C
V
CC
T
1
, T
2
, T
3
V
DD
GND
SP
The pin to connect the negative pin of the capacitor for the voltage multiplier. Leave the
pin open when the voltage multiplier circuit is not used.
The pin to connect the positive pin of the capacitor used for the voltage multiplier.
Leave the pin open when the voltage multiplier circuit is not used.
The input pins for test circuits (normally open). Each of these pins is equipped with a
pull-down resistor, so this pin should be left open.
The power supply pin.
The ground level input pin.
The input pin to select the serial or parallel interface.
“L” selects the parallel interface.
“H” selects the serial interface.
The output pin to fix the adjacent input pin to the V
DD
level. Use this pin only for this
purpose.
The output pin to fix the adjacent input pin to the GND level. Use this pin only for this
purpose.
NC (No Connection) pin.
DUMMYV
DD
DUMMYGND
DUMMY
5/58
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