hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 11

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

Signals
VcomR
VcomH
VcomL
C11+, C11-
C12+, C12-
C21+, C21-
C22+, C22-
OSC1, OSC2
FLM
Vci
VciLVL
REGP
VciOUT
Vci1
VLOUT1
DDVDH
HD66789
Rev.0.12, May 09 2003, page 11 of 156
Number
of Pins
1
1
1
2
6
2
1
1
1
1
1
1
1
1
I/O
I
O
O
-
-
I or O
O
I
I
I/O
I
I
O
I
Connected
to
Variable
resistor or
open
Stabilizing
capacitor
Stabilizing
capacitor
or open
Step-up
capacitor
Step-up
capacitor
Resistor for
the
oscillator
MPU or
open
Power
supply
Power
supply
Test pin
Stabilizing
capacitor,
Vci1
VciOUT
Stabilizing
capacitor,
DDVDH
VLOUT1
Functions
Reference voltage for VcomH.
When adjusting VcomH externally, VcomH internal adjusting
circuit must be halted by register setting and place a variable
resistor between VREG1OUT and GND to make an adjustment.
Otherwise, leave open and adjust VcomH by internal register
setting.
High level of Vcom during Vcom AC drive. Connect to a
stabilizing capacitor.
Vcom voltage when Vcom AC drive is not selected.
Low level of Vcom during Vcom AC drive. Voltage can be
adjusted with internal registers. Connect to a stabilizing
capacitor. When VCOMG bit is set to LOW, a stabilizing
capacitor is not necessary because VcomL output is halted.
Step-up capacitor connection pins for step-up circuit 1. When
the internal step-up circuit is not used, leave open.
Step-up capacitor connection pins for step-up circuit 2.
Capacitor connection will be necessary depending on the step-
up scale. When the internal step-up circuit is not used, leave
open.
Connect an external resistor for R-C oscillation. When supplying
clock signals externally, it must be supplied through OSC1 and
leave OSC2 open.
Frame head pulse with amplitude between GND and Vcc.
Use when writing data to RAM in synchronization with FLM.
When FLM is not used, leave open.
Power supply for analogue circuits.
In this case, a power supply for the VciOUT amplifier. Connect
an external power supply of 2.5~3.3V.
Generates a reference voltage (VciOUT, REGP) in accordance
to the ratio set with VC2~0 registers.
Connect to the same power supply as the Vci, which has
separate wiring from the VciLVL on the FPC.
Test pin for VREG1OUT. Leave open.
Internal reference voltage with amplitude between Vci and GND.
Set with VC bit.
Reference voltage for the step-up circuit 1.
Connect to an external power supply of 2.75V or less when the
internal reference voltage is not used.
Output twice stepped-up Vci1 voltage from the step-up circuit 1.
Connect to a stabilizing capacitor. VLOUT1 = 4.0~5.5V
Power supply for source driver liquid crystal output portion. A
reference voltage for the step-up circuit 2.
Preliminary