HD66789 Datasheet, PDF (11/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Signals
VcomR
VcomH
VcomL
C11+, C11-
C12+, C12-
C21+, C21-
C22+, C22-
OSC1, OSC2
FLM
Vci
VciLVL
REGP
VciOUT
Vci1
VLOUT1
DDVDH
Preliminary
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 Functions
to
Variable
resistor or
open
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.
Stabilizing High level of Vcom during Vcom AC drive. Connect to a
capacitor stabilizing capacitor.
Stabilizing
capacitor
or open
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
Step-up capacitor connection pins for step-up circuit 1. When
the internal step-up circuit is not used, leave open.
Step-up
capacitor
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.
Resistor for Connect an external resistor for R-C oscillation. When supplying
the
clock signals externally, it must be supplied through OSC1 and
oscillator leave OSC2 open.
MPU or
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
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.
Power
supply
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
Test pin for VREG1OUT. Leave open.
Stabilizing
capacitor,
Vci1
Internal reference voltage with amplitude between Vci and GND.
Set with VC bit.
VciOUT
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.
Stabilizing
capacitor,
DDVDH
Output twice stepped-up Vci1 voltage from the step-up circuit 1.
Connect to a stabilizing capacitor. VLOUT1 = 4.0~5.5V
VLOUT1
Power supply for source driver liquid crystal output portion. A
reference voltage for the step-up circuit 2.
Rev.0.12, May 09 2003, page 11 of 156