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LV52207NXB Datasheet(PDF) 7 Page - ON Semiconductor |
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LV52207NXB Datasheet(HTML) 7 Page - ON Semiconductor |
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7 / 18 page  LV52207NXB www.onsemi.com 7 LED Current Setting (max sink current) LED_full current is set by an external resistor connected between the RT pin and ground. _ 2113 ∗ : RT pin DC Voltage; typically 0.6 V : RT pin resistor to ground Eg: RT_res= 63.4 k at typical V RT _ 2113 ∗ 2113 ∗ . . 19.99 ≅ 20 BRIGHTNESS CONTROL The LV52207NXB controls the DC current of the dual channels. The DC current control is normally referred to as analog dimming mode. The LV52207NXB can receive digital commands at the EN pin (1-wire digital interface, known as Digital Mode) and the PWM signals at the PWM pin (PWM interface, known as PWM Mode) for brightness dimming. Dimming Mode Selection Dimming Mode is selected by a specific pattern of the EN pin within TSEL of 1.0 ms from the startup of the device every time. Digital Mode To enter Digital Mode, EN pin should be taken high for more than Tw0 =100s from the first rising edge and keep low state for TW1 = 260s before TSEL=1ms. When using Digital mode, the PWM pin should be kept high. It is required sending the device address byte and the data byte to select LEDI. The bit detection is determined by the ratio of TH and TL(See Fig5). The start condition for the bit transmission required EN pin high for at least Tstart. The end condition is required EN pin low for at least Tend. When data is not being transferred, EN pin is set in the “H” state. These registers are initialized with shutdown. Start up and Shutdown The device becomes enabled when EN pin is initially taken high. The dimming mode is determined within TSEL and the boost converter start up after TDEL. To place the device into shutdown mode, the SWIRE must be held low for TOFF. For specific timings please refer to the Recommended EN PWMIN Timing Table on page 3 or the below figures. Digital MODE Fig3. Start up and shutdown diagram (DIGITAL MODE) |
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