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AAT3128ITO-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT3128ITO-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
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8 / 12 page  AAT3128 RGB LED Fashion Lighting Controller ChargePumpTM PRODUCT DATASHEET 8 3128.2008.02.1.1 www .analogictech.com based on the current set level programmed by the RSET resistor. The second dimming level is fixed at 6dB below that programmed by the RSET resistor. The pace of the color change for a given mood light option can be set to a fast or slow rate. Through the S2Cwire interface, mood options allow the user to select between four different moods, each with two brightness levels and two speeds, based on the number of rising edges of the EN/SET pin. 16 unique moods are selected based on the settings in Table 2. EN/SET Serial Interface The lighting mood output is controlled by the EN/SET pin, using AnalogicTech’s Simple Serial Control™ (S2Cwire) interface. The interface records rising edges of the EN/SET pin, and decodes them into 16 individual set- tings based on an internal preset ROM table. The inter- face counter can be clocked at speeds up to 1MHz. The rising edges of EN/SET input enable the IC and are counted for 1 to 16 edges based on the desired mode. Once the final clock cycle is input for the desired mode the EN/SET pin is held high to enable the device output. The device is disabled 500μs after the EN/SET pin transi- tions to a logic low state. The EN/SET timing is designed to accommodate a wide range of data rates. After the first rising edge of EN/SET, the charge pump is enabled and reaches full capacity after the soft-start time (TSS). During the soft start time, mul- tiple clock pulses may be entered on the EN/SET pin to set the final output current level with a single burst of clocks. A constant current is sourced and the programmed color mood is enabled as long as EN/SET remains in a logic high state. The current source outputs are switched off after EN/SET has remained in a low state for at least the TOFF timeout period. After the TOFF time out time, all internal registers are reset and the charge pump is disabled. It is advisable to issue a 500μs low pulse to reset the data registers before send new sets of data to change lighting modes. This will avoid any possibility of losing synchroni- zation between the AAT3128 and the system MCU. Mood Name Color Description M1 Rainbow 1 Full color wheel control with continu- ous smooth transitions M2 Electric Beat Pulsing Blue – White – Red color tones M3 Rainbow 2 Full color wheel control with varied timing for transitions M4 Firelight Red-Orange-Yellow flickering light Table 1: Programmable RGB LED Color Lighting “Moods.” Data Bright/Dim Fast/Slow Mood 1B F M1 2B F M2 3B F M3 4B F M4 5B S M1 6B S M2 7B S M3 8B S M4 9D F M1 10 D F M2 11 D F M3 12 D F M4 13 D S M1 14 D S M2 15 D S M3 16 D S M4 Table 2: AAT3128 S2Cwire Programming Modes. EN/SET Timing EN/SET Code 1 2 3 OFF OFF t HI t LO tOFF Figure 1: S2Cwire Timing Diagram. |
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