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SC627 Datasheet(PDF) 17 Page - Semtech Corporation |
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SC627 Datasheet(HTML) 17 Page - Semtech Corporation |
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17 / 23 page  SC627 17 Register Map Address D7 D6 D5 D4 D3 D2 D1 D0 Reset Value Description 0x00 FADE_1 FADE_0 FADE_EN BL_4 BL_3 BL_2 BL_1 BL_0 0x00 Backlight Current Control 0x01 0(1) 0(1) 0(1) 0(1) BLEN_4 BLEN_3 BLEN_2 BLEN_1 0x00 Backlight Enable Control 0x02 0(1) 0(1) 0(1) FLTO FL_2 FL_1 FL_0 FL/SPLB 0x10 Flash/Spotlight Control 0x03 0(1) LDO2_2 LDO2_1 LDO2_0 LDO1_3 LDO1_2 LDO1_1 LDO1_0 0x00 LDO Control Notes: (1) 0 = always write a 0 to these bits Register and Bit Definitions Backlight Current Control Register (0x00) This register is used to set the currents for the backlight current sinks, as well as to enable and set the fade step rate. These current sinks need to be enabled in the Backlight Enable Control register to be active. FADE[1:0] These bits are used to set the rise/fall rate between two backlight currents as follows: FADE_1 FADE_0 Fade Feature Rise/Fall Rate (ms/step) 0 0 32 01 24 10 16 11 8 The number of steps in changing the backlight current will be equal to the change in binary count of bits BL[4:0]. FADE_EN This bit is used to enable or disable the fade feature. When the fade function is enabled and a new backlight current is set, the backlight current will change from its current value to a new value set by bits BL[4:0] at a rate of 8ms to 32ms per step. A new backlight level cannot be written during an ongoing fade operation, but an ongoing fade operation may be cancelled by resetting the fade bit. Clearing the fade bit during an ongoing fade operation changes the backlight current immediately to the value of BL[4:0]. The number of counts to complete a fade operation equals the difference between the old and new backlight values to increment or decrement the BL[4:0] bits. If the fade bit is cleared, the current level will change immediately without the fade delay. The rate of fade may be changed dynamically, even while a fade operation is active, by writing new values to the FADE_1 and FADE_0 bits. The total fade time is determined by the number of steps between old and new backlight values, multiplied by the rate of fade in ms/step. The longest elapsed time for a full scale fade-out of the backlight is nominally 1.024 seconds when the default interval of 32ms is used. |
Similar Part No. - SC627_09 |
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Similar Description - SC627_09 |
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