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AAT3151 Datasheet(PDF) 10 Page - Advanced Analog Technology, Inc. |
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AAT3151 Datasheet(HTML) 10 Page - Advanced Analog Technology, Inc. |
10 / 15 page AAT3151 High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications 10 3151.2007.03.1.10 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-channel, giving 16 settings for each. The main and sub-channel are programmed to the same constant current level by using Address 1. Use Addresses 2 and 3 to program the main and sub- channel independently. Use Address 4 to program the Max Current register, which sets the Max Current scale. Address 5 programs the Low Current register. The Low Current register controls the effi- cient Low Current mode. When the Max Current register is programmed to 1, 2, or 3, changing the data for Addresses 1-3 will result in the corresponding 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 prece- dence. See Table 2 for the current level settings and main/sub-configurations that result. Table 2: Low Current Register Settings. 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 AAT3151 operates in the 20mA Max scale (see Constant Current Programming 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-D4 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 AAT3151 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 exam- ple, 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 rising 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 significantly reduced quiescent current. EN/SET Addressed Address Edges Register 1 17 1&2: D1-D4 Current 2 18 1: D1-D3 Current 3 19 2: D4 Current 4 20 3: Max Current 5 21 4: Low Current |
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