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LED171596ARSLR Datasheet(PDF) 15 Page - Texas Instruments |
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LED171596ARSLR Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 153 page  BUFFER REGISTERS MASTER BRIGHTNESS SLOPE_TARGET LED00_SLOPE ... ... LED95_SLOPE LED_GRP1_BRI LED_GRP2_BRI LED_GRP3_BRI LED00_GRPSEL ... ... LED95_GRPSEL LED_00_BRI ... ... LED_95_BRI LED_00_CUR ... ... LED_95_CUR PWM DETECTOR I2C/SPI INTERFACE MASTER SLOPER MATRIX SLOPER PWM GENERATOR LATCH SS_PWM SCK_SCL MOSI_SDA MISO_ADDR LED SEQUENCER IFSEL_LATCH MASTER_SLOPE_EN MASTER_SLOPE_SEL EN_PWM_DETECTOR 1 0 LED DUTY CYCLES LED CURRENTS LED DRIVER 00 LED DRIVER 23 MATRIX_SLOPE_SEL 11 10 01 00 e e n Copyright © 2016, Texas Instruments Incorporated 15 LED171596A www.ti.com SNVSAY2 – OCTOBER 2017 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated NOTE If master sloper is enabled then actual brightness value is sloping towards new master brightness value and thus takes time to reach the calculated value. Figure 12. Brightness Path 7.3.3.1.2 Individual LED Brightness Control Method Every LED has an individual brightness and current register that are used to change the LED brightness. The brightness and current registers of each LED are individually addressable, so if only one LED brightness must be changed then only one 9-bit register needs to be written. This reduces interface bus traffic compared to other devices. If all LEDs must be updated then up to 96 × 9-bit brightness, and 96 × 8-bit current registers must be written. A LATCH command is required to apply updated values. 7.3.3.1.3 Matrix Sloper Brightness Control Method The matrix sloper block is used to control both up and down dimming for selected LEDs. LEDs are assigned to the matrix sloper using their individual LEDXX_SLOPE bits. There are 4 states of how the sloper control affects the selected LEDs: 1. LED or group of LEDs is not selected for dimming (brightness = 100%) 2. LED or group of LEDs is sloping toward target brightness value (100% → SLOPE_TARGET) 3. LED or group of LEDs is sloping toward 100% brightness value (SLOPE_TARGET → 100%) 4. LED or group of LEDs is kept at target value (SLOPE_TARGET) The matrix sloper configuration starts by writing to the LEDxx_SLOPE registers (12 registers) for each LED. Selected LEDs must all be starting from the same LEDxx_BRI value. SLOPE_TARGET value and sloper duration registers are then configured. The LATCH signal (minimum tLATCH) or register bit triggers the start of sloping. The INT signal is asserted when matrix sloper is done. A special case is if one group of LEDs is dimming towards SLOPE_TARGET and the second group is dimming toward 100% at the same time. |
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