hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 48

• 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.

HD66789
Power Control 1 (R10h)
Power Control 2 (R11h)
SAP2-0: Adjust the amount of fixed current from the fixed current source of operational amplifier for the
source driver. When the amount of fixed current is set large, the operational amplifier will stabilize, while
the current consumption will increase. Select an optimum amount of current taking both the display quality
and the current consumption into account. During non-display operation, set SAP2-0 = “000” to halt the
operation of operational amplifier, to reduce the current consumption.
SAP Bits and the amount of current for the Op-amp
SAP2
0
0
0
0
BT2–0: Change the step-up scale of the step-up circuit. Adjust the scale according to the voltage. Smaller
scale consumes lesser current.
DC02–00: Select the operating frequency for the step-up circuit 1. The higher frequency enhances the
drive capacity of step-up circuit as well as the display quality, while the current consumption will increase.
Adjust the frequency taking both the display quality and the current consumption into consideration.
DC12–10: Select the operating frequency for the step-up circuit 2. The higher frequency enhances the
drive capacity of step-up circuit as well as the display quality, while the current consumption will increase.
Adjust the frequency taking both the display quality and the current consumption into consideration.
AP2–0: Adjust the amount of fixed current from the fixed current source of operational amplifier for the
liquid crystal drive power supply. When the amount of fixed current is set large, the liquid crystal drive
capacity will be enhanced and the display quality will improve, while the current consumption will increase.
Select an optimum amount of current taking both the display quality and the current consumption into
account. During non-display operation, set AP2-0 = “000” to halt the operation of operational amplifier to
reduce current consumption.
DK: Control the operation of the step-up circuit 1. When turning on the power supply, stop the start up of
VLOUT1 for a moment, and wait for an enough time until VLOUT2 is stabilized before starting up
VLOUT1. For details, see the “Power Supply Setting Flow” section.
Rev.0.12, May 09 2003, page 48 of 156
R/W
W
W
RS
SAP1
0
0
1
1
1
1
IB15 IB14 IB13 IB12 IB11 IB10 IB9
0
0
SAP0
0
1
0
1
SAP2 SAP1 SAP0
0
Op-amp Current
Halt
Setting disabled
0.62 (fixed)
0.71 (fixed)
0
0
0
0
DC12 DC11 DC10
BT2 BT1 BT0
SAP2
1
1
1
1
IB8
IB7
SAP1
0
0
1
1
0
0
IB6
DC02 DC01
AP2 AP1
SAP0
0
1
0
1
IB5
DC00
IB4
AP0
Op-amp Current
1 (fixed)
1.25 (fixed)
1.43 (fixed)
Setting disabled
IB3
0
0
IB2
DK
VC2 VC1 VC0
Preliminary
IB1
SLP STB
IB0