Renesas R61509V Power Control Power Control 1 R100h, Constant Current in Operational Amplifiers

R61509V Target Spec

Power Control

Power Control 1 (R100h)

R/W	RS	IB15	IB14	IB13	IB12	IB11	IB10	IB9	IB8	IB7	IB6	IB5	IB4	IB3	IB2	IB1	IB0
R/W	1	0	0	0	0	0	BT	BT	BT	0	0	AP	AP	0	DST	0	0
							[2]	[1]	[0]			[1]	[0]		B
Default		0	0	0	0	0	0	1	1	0	0	1	1	0	0	0	0

DSTB: When DSTB = 1, the R61509V enters the shut down mode. In shut down mode, the internal logic power supply is turned off to reduce power consumption. The GRAM data and instruction setting are not maintained when the R61509V is in the shut down mode. Set the instruction again after the shut down mode is exited. GND level is outputted to the panel in the shut down mode.

AP[1:0]: Adjusts the constant current in the operational amplifier circuit in the LCD power supply circuit. The larger constant current, the better the drivability of the LCD, but it also increases the current consumption. Adjust the constant current taking the trade-off between the display quality and the current consumption into account. In no-display period, set AP[1:0]=2’h0 to halt operational amplifiers and step- up circuits to reduce power consumption.

Table 40 Constant Current in Operational Amplifiers

AP[1:0]	Electricity in LCD drive power supply amplifiers
2’h0	Operational amplifiers and step-up circuits halt
2’h1	0.5
2’h2	0.75
2’h3	1

Note: The values in the table represent the ratios of currents in respective settings to the current when AP[1:0]=2’h3.

Rev. 0.11 April 25, 2008, page 67 of 181