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EHD66764 Schematic ( PDF Datasheet ) - Hitachi

Teilenummer EHD66764
Beschreibung 176-channel Common Driver for Color Displays
Hersteller Hitachi
Logo Hitachi Logo 




Gesamt 30 Seiten
EHD66764 Datasheet, Funktion
HD66764
176-channel Common Driver for Color Displays
Rev.1.0
September, 2001
Description
The HD66764 is a common-driver LSI for systems with color-liquid-crystal dot-matrix graphic
displays. It incorporates 176 LCD drive circuits and power-supply circuits. An external capacitor is
also needed for the liquid crystal display.
This LSI, when used with the HD66763 384-channel segment driver with on-chip RAM, is suitable for
color displays of cellular phones to a maximum of 128-by-176 dots.
Features
LCD drive circuits
176 outputs
Internal power-supply circuit
Step-up circuit: twice to 12 times, positive-polarity inversion
Bias setting: 1/2 to 1/13, programmable
Contrast adjustment: 128-level programmable volume
Dividing resistors: built-in (controls the bias)
Setting: serial transfer from the HD66763 segment driver
Low power consumption
Power-supply voltage
Vcc = 1.8 to 3.6 V
LCD drive voltage
VLCD-VEE = 10 to 44 V (VM standard: ± 5 to ± 2 2 V)
Package
TCP and chip






EHD66764 Datasheet, Funktion
HD66764
Pin Functions
Table 1 Pin Functions
Signal Name
Vcc
GND
VLCD
VEE
VciOUT
Vci1
Vci2
VCH
VSH
VM
VCL
VLOUT1
VLOUT2
C11+, C11- to
C23+, C23-
CE+, CE-
Quantity
1
1
1
1
1
1
1
4
1
1
10
2
Input/
Output
-
-
-
-
-
-
-
-
-
-
-
-
Connected to
Power supply
Power supply
Power supply
or VLOUT2
Power supply
or VCL
Vci1 and
capacitor for
stabilization or
open
VciOUT or
power supply
VLOUT1 or
power supply
Capacitor for
stabilization
and VSH of
HD66763 or
external power
supply
Step-up
capacitance/
Vci2 pin
Step-up
capacitance/
VLCD pin
Step-up
capacitance or
open
Step-up
capacitance or
open
Function
VCC-GND: Logic-circuit power supply. Supply
the same voltage as for the HD66763.
LCD-drive-circuit power supply, positive side.
LCD-drive-circuit power supply, negative side.
Outputs a regulated voltage derived from Vcc.
Connect a capacitor for stabilization. When this
pin is not used, leave it open.
Voltage-input pin for step-up circuit 1. When the
Vci adjuster is used, input the power supply from
VciOUT. When not used, input the external
power supply.
Voltage-input pin in step-up circuit 2. When the
internal step-up circuit is not used, leave this pin
open.
When the internal power supply circuit is used, the
LCD-drive-level power supply is output here.
VCH, VM, and VCL are used for the common
driver, and VSH for the segment driver. Connect
a capacitor for stabilization of the display quality.
When the internal power-supply circuit is not
used, connect the output of the external power-
supply circuit. However, VSH need not be
supplied.
A voltage that doubles or triples the voltage
between Vci1 and GND is output here. The
step-up factor can be set in an internal register.
A voltage that is boosted from the voltage
between Vci1/Vci2 and GND is output here. The
step-up factor can be set in an internal register.
Connect a step-up capacitor according to the
step-up factor. When the internal step-up circuit
is not used, leave this pin open.
Connect a step-up capacitor for generating the
VCL level from the VCH and VM levels. When
the internal step-up circuit is not used, leave this
pin open.
6

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EHD66764 pdf, datenblatt
HD66764
Table 2 BS Bits and LCD Drive Bias Value
BS2 BS1 BS0 LCD Drive Bias Value
0 0 0 1/13 bias
0 0 1 1/12 bias
0 1 0 1/11 bias
0 1 1 1/10 bias
1 0 0 1/9 bias
1 0 1 1/8 bias
1 1 0 1/4 bias
1 1 1 1/2 bias
Table 3 BT Bits and VLOUT1 and VLOUT2 Outputs
BT3 BT2 BT1 BT0 VLOUT1 Output
0 0 0 0 2 x Vci1
0 0 0 1 3 x Vci1
0 0 1 0 2 x Vci1
0 0 1 1 3 x Vci1
0 1 0 0 2 x Vci1
0 1 0 1 3 x Vci1
0 1 1 0 2 x Vci1
0 1 1 1 3 x Vci1
1 0 0 0 2 x Vci1
1 0 0 1 3 x Vci1
1 0 1 0 2 x Vci1
1 0 1 1 3 x Vci1
1 1 0 0 2 x Vci1
1 1 0 1 3 x Vci1
1 1 1 0 2 x Vci1
1 1 1 1 3 x Vci1
VLOUT2 Output
2 x Vci2
2 x Vci2
3 x Vci2
3 x Vci2
4 x Vci2
4 x Vci2
Step-up stopped
Step-up stopped
Vci1 + Vci2
Vci1 + Vci2
Vci1 + 2 x Vci2
Vci1 + 2 x Vci2
Vci1 + 3 x Vci2
Vci1 + 3 x Vci2
Vci2
Vci2
12

12 Page





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