ML9055A View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
Manufacturer
ML9055A Datasheet PDF : 59 Pages
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OKI Semiconductor
PEDL9055A-02-01
ML9055A-02
PIN DESCRIPTIONS
Function
Symbol
VDD
VSS
V0
V1
Power Supply
V2
V3
V4
C1–
C1+
C2–
C2+
C3+
C4+
C5+
VOUT
VCI
LCD Driver Supply
VR
REF
VEXT
INTRS
Type
Supply
Supply
I/O
Description
Power supply
Ground
LCD drive power supply voltage pin V0, and LCD drive bias
voltage pins V1 to V4
When applying the LCD drive power supply voltage and each
LCD drive bias voltage from outside, notice to hold the following
relationship:
VSS < V4 < V3 < V2 < V1 < V0
The LCD drive bias voltages are generated when using the
built-in voltage follower.
For the value of each generated bias voltage, refer to the
“Voltage Follower Circuit” section in this document.
O
Connection pins of capacitors for multiplied voltage
O
Connect capacitors for the voltage multiplier to these pins.
O
(Connect pins with + sign to positive polarity of respective
O
capacitors and pins with – sign to negative polarity of respective
O
capacitors.)
O
The connections of capacitors for multiplying voltage differ
depending upon the voltage multiplication.
O
The connections of the capacitors for multiplying voltage are
described in the “Voltage Multiplier” section.
Voltage multiplier input/output pins
When using an internal voltage multiplier, the following voltage is
output from the VOUT pin:
I/O
VOUT = VCI x Voltage multiplication
When not using the internal voltage multiplier, input the external
power supply voltage from this VOUT pin.
About the pin processing in the case of an external input, refer to
the “LCD Drive Power Supply Circuit” section.
I
Multiplied voltage input pin of internal voltage multiplier
When using an external power supply, tie this pin to VSS.
V0 voltage adjustment pin (Adjusts V0 using external resistors.)
When INTRS pin = “L”, the V0 voltage is adjusted by connecting
external resistors to this pin.
The method of connecting external resistors is described in the
“LCD Drive Power Supply Circuit” section.
I
When INTRS pin = “H”, keep this VR pin open.
Note: When INTRS pin is “H”, the internal resistors are selected
for adjusting V0 and a very high internal resistor gets connected
to VR pin. Therefore this ML9055A can be vulnerable to external
noise. In designing the circuit board, pay proper attention to the
external noise and leak.
I
Internal/external reference voltage select pin. (L: External, H:
Internal)
External reference voltage (VREF) input pin. (Valid only when
I
REF= L.)
When using the internal reference power supply, keep this pin
open.
I
V0 adjustment resistor select pin (L: External, H: Internal)
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