HD66420 Datasheet, PDF (4/52 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

HD66420
Pin Description
Number of
Pin Name Pins
I/O
V_CC1–6,
12
—
GND1–6
VLCD1–4 4
—
V1O, V2O, 5
—
V3O, V4O,
V5O
OSC
1
I
OSC1,
2
I/O
OSC2
CO
1
O
DCON
1
O
CL1
1
I/O
FLM
1
I/O
M
1
I/O
M/S
1
I
RES
1
I
CS
1
I
RS
1
I
WR
1
I
RD
1
I
DB7 to DB0 8
I/O
SEG1 to 160
O
SEG160
COM1 to 80
O
COM80
IREFP
1
—
IREFM
1
—
GREF
1
—
Connected to Description
Power supply V_CC: +2.2V to +5.5V, GND: 0V
Power supply
V1 to V5 of
HD66420
Oscillator
resister or
external clock
Power supply to LCD driving circuit
Several levels of power to the LCD driving outputs.
Master HD66420 outputs these levels to the slave
HD66420.
Must be connected to external resister when using R-C
oscillation. When using an external clock, it must be
input to the OSC terminal.
OSC of Slave Clock output
HD66420
External DC/DC Controls on/off switch of external DC/DC convertor
convertor
CL1 of
HD66420
Line clock
FLM of
HD66420
Frame signal
M of HD66420 Converts LCD driving outputs to AC
V_CC or GND
—
Specifies master/slave mode.
Reset the LSI internally when drive low.
MPU
Select the LSI, specifically internal registers (index and
data registers) when driven low.
MPU
Select one of the internal registers; select the index
register when driven low and data registers when driven
low.
MPU
Inputs write strobe; allows a write access when driven
low.
MPU
Inputs read strobe; allows a read access when driven
low.
MPU
8-bits three-state bidirectional data bus; transfer data
between the HD66420 and MPU through this bus.
LCD
Output column drive signals
LCD
Output row drive signals
V_CC
Power supply for internal operation amplifier
External resistor Bias current for internal operational amplifier
GND
Power supply for internal operation amplifier
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