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LP8555 Datasheet(PDF) 47 Page - Texas Instruments |
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LP8555 Datasheet(HTML) 47 Page - Texas Instruments |
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47 / 64 page  LP8555 www.ti.com SNVS857 – FEBRUARY 2014 Typical Applications (continued) 9.2.1.2 LP8555YFQR EPROM Configuration ADDRESS BIT BIT NAME BIT DESCRIPTION VALUE MEANING REG VALUE (HEX) (HEX) 00 2 SREN Boost slew rate limit enable 0b 0 = Boost slew rate not limited 00 1 SSEN Spread spectrum enable 0b 0 = Spread spectrum disabled 0 ON Backlight enable 0b 0 = Backlight enabled only by writing this bit to 1 10 7 PWMSB Enable automatic PWM input shutdown 0b 0 = Shutdown function disabled 64 6 PWMFILT Enable PWM input filtering 1b 1 = PWM input analog 50 ns filter enabled 5 EN_BPHASE180 Enable boost 180° phase difference 1b 1 = Boosts clocks are 180° shifted 4 - 0b 3 RELOAD Enable EPROM read at every BL enable 0b 0 = EPROM is read only at first start- sequence up 2 AUTO Enable auto detect for number of LEDs 1b 1 = LED string auto detection during start-up enabled 1:0 BRTMODE Brightness control mode 00b 00 = PWM input duty control only 11 7 ISET Enable external resistor setting of LED 0b 0 = LED current set with registers 05 string current 6:3 - 0000b 2:0 MAXCURR Set maximum DC current per string 101b 101 = 25 mA 12 7 PFSET Enable external resistor PWM frequency 0b 0 = PWM frequency selected with 2B setting registers 6 - 0b 5:3 THRESHOLD Hybrid PMW and Current Control switch 101b 101 = 25% switch point point control 2:0 PFSET PWM frequency selection 011b 011 = 19.5 kHz 13 7 - 0b 01 6 - 0b 5:2 - 0000b 1 BIND Boost inductor selection 0b 0 = 4.7 µH ... 6.8 µH inductor 0 BFREQ Boost SW frequency 1b 1 = 1 MHz 14 7:6 OV Set LED high comparator detection level 10b 10 = 3 V BF 5:0 ENABLE_0 LED bank A string enable 111111b 1 = Enabled (all six strings) 15 7:6 SMOOTH Advanced Sloping smoothing factor 00b 00 = No smoothing 20 5:3 PWM_IN_HYST PWM input hysteresis 100b 100 = >8 LSB steps 2:0 STEP Linear Slope time 000b 000 = 0ms 16 7:6 VMAX_0 Bank A boost maximum voltage 11b 11 = 28 V F8 5 ADAPT_0 Enable boost adaptive control for bank A 1b 1 = Adaptive headroom enabled 4:0 VINIT_0 Initial voltage for bank A boost 11000b 11000 = 23.26 V 19 5:0 ENABLE_1 LED bank B string enable 111111b 1 = Enabled (all six strings) 3F 1A 7 VMAX_1 Bank B boost maximum voltage 11b 11 = 28 V F8 6 ADAPT_1 Enable boost adaptive control for bank B 1b 1 = Adaptive headroom enabled 5 VINIT_1 Initial voltage for bank B boost 11000b 11000 = 23.26 V 1E 7:4 ID_CUST ID register, Customer ID 0000b 0000 00 3:0 ID_CFG ID register, EPROM config 0000b 0000 76 7 BOOST_IS_DIV2 Option divide Imax peak current by 2 0b 0 = Normal current limit 0B 6:5 - 00b 4 ALTID I2C slave ID selector 0b 0 = 2Ch (7-bit) 3:2 SRON Slowed boost slew rate 10b When COMMAND.SREN is set to 1 this value is used. 10 = Second slowest 1:0 CURR_LIMIT Inductor peak current limit 11b 11 = 3.1 A Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 47 Product Folder Links: LP8555 |
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