HD66789 Datasheet, PDF (12/156 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
VLOUT2
VGH
VLOUT3
VGL
VLOUT4
VCL
VREG1OUT
Vcc
IOVcc
RVcc
GND
AGND
RGND
CGND
TEST1
TEST2
Number I/O
of Pins
1
O
1
I
1
O
1
I
1
O
1
I
1
I/O
1
-
1
-
1
-
1
-
1
-
1
-
1
O
1
I
1
I
Preliminary
Connected Functions
to
Stabilizing
capacitor,
VGH
Output stepped-up DDVDH voltage, which is stepped up to the
level Vci1 x 4~6 from the step-up circuit 2. The step-up scale is
determined with BT bits. Connect to a stabilizing capacitor.
VLOUT2 = max 16.5V
VLOUT2 Power supply for TFT gate drive. Connect to VLOUT2.
Stabilizing
capacitor,
VGL
Output stepped-up DDVDH voltage, which is stepped up to the
level Vci1 x (- 3) ~ (-5) from the step-up circuit 2. The step-up
scale is determined with BT bits. Connect to a stabilizing
capacitor. VLOUT2 = min -16.5V
VLOUT3 Power supply for TFT gate drive. Connect to VLOUT3.
Stabilizing
capacitor,
VCL
Output the Vci1 x (-1) voltage from the step-up circuit 2.
Connect to a stabilizing capacitor. VLOUT4 = 0 ~ -3.3V
VLOUT4 Power supply for VcomL drive. Connect to VLOUT4.
Stabilizing
capacitor
or power
supply
Reference voltage with amplitude between DDVDH and GND,
which is generated from the reference voltage internally
generated with amplitudes between Vci and GND.
The scale of the output voltage can be set with VRH bits.
VREG1OUT becomes (1) a source driver grayscale reference
voltage VDH, (2) a VcomH level reference voltage, or (3) a Vcom
amplitude reference voltage. Connect to a stabilizing capacitor.
VREG1OUT = 3.0 ~ (DDVDH – 0.5)V
Power
supply
Power supply for a logic circuit. Vcc = 2.4~3.3V
Power
supply
Power supply for interface pins. IOVcc = 1.8~3.3V. IOVcc must
be turned on with the same voltage as the internal logic voltage
Vcc. When it is assembled on COG, connect to Vcc on the FPC
to avoid effects from the noise when IOVcc is used.
Power
supply
Vcc power supply for RAM. Supply with the same potential as
the Vcc.
Power
supply
Ground for the logic side. GND = 0V
Power
supply
Ground for the analog side. AGND = 0V. When assembled on
COG, connect to GND on the FPC to avoid effects from the
noise.
Power
supply
Ground for internal RAM. RGND = 0V. When assembled on
COG, connect to GND on the FPC to avoid effects from the
noise.
Opposing
GND for
external
parts
GND level output. Available as an opposing GND for external
parts (capacitors, diodes).
GND
Test pin. Fix it to the GND level.
GND
Test pin. Fix it to the GND level.
Rev.0.12, May 09 2003, page 12 of 156