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AAT3156 Datasheet(PDF) 10 Page - Advanced Analog Technology, Inc. |
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AAT3156 Datasheet(HTML) 10 Page - Advanced Analog Technology, Inc. |
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10 / 14 page  AAT3156 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications 10 3156.2005.09.1.2 AS 2Cwire Serial Interface Timing Address Data 1 EN/SET 2 17 18 Address Data Reg 1 Data Reg 2 1 2 . . . n <= 16 12 1 1 n T HI TLO TLAT T LAT AS 2Cwire Addressing Five addresses are available to enable all of the part's functionality. Two 4-bit registers control the main and sub-channels, giving 16 settings for each. The main and sub-channels are programmed to the same constant current level by using Address 1. Use Addresses 2 and 3 to program the main and sub-channels independently. Use Address 4 to pro- gram the Max Current register, which sets the Max Current scale. Lastly, Address 5 programs the Low Current register. The Low Current register controls the efficient Low Current mode. When the Max Current register is programmed to 1, 2, or 3, chang- ing the data for Addresses 1-3 will result in the cor- responding values found in the Constant Current Programming Levels table. When the Max Current register is programmed to 4, the part is programmed to operate in Low Current mode and the Data for Addresses 1-3 is irrelevant. In Low Current mode, the Low Current register takes precedence. See the Low Current Register Settings table below for the current level settings and main/sub-configurations that result. Max Current and Low Current Registers Use the Max Current and Low Current registers to program constant current settings outside of the 20mA Max scale. By default (without changing the Max Current register), the AAT3156 operates in the 20mA Max scale (see Constant Current Program- ming Levels). For example, to change to the 30mA Max scale, address the Max Current register with 20 rising edges and pause for T LAT. Program the Max Current register with 2 rising edges and pause for T LAT. The part will next operate in the same Data row, but for the setting found in the 30mA Max col- umn. Next, to change to a different setting on the 30mA Max scale, address the D1-D6 register with 17 rising edges. Program the new constant current level with 1-16 rising edges. The part will update to the new Data setting according to the Constant Current Programming Levels table. The AAT3156 has a distinct Low Current mode with ultra-low quiescent current. For drive currents of 2mA or less, the part operates with significantly reduced quiescent current. This is particularly use- ful for applications requiring an "always on" condi- tion such as transmissive displays. As an example, to change to Low Current mode, address the Max Current register with 20 rising edges and pause for T LAT. Program the Max Current register with 4 ris- ing edges and pause for T LAT. Address the Low Current register with 21 rising edges and pause for T LAT. Program the Low Current register with 1-16 rising edges. The part will update to the new Low Current mode setting and operate with significant- ly reduced quiescent current. EN/SET Addressed Address Edges Register 1 17 1&2: D1-D6 Current 2 18 1: D1-D4 Current 3 19 2: D5-D6 Current 4 20 3: Max Current 5 21 4: Low Current |
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