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BD1754HFN-TR Datasheet(PDF) 7 Page - Rohm |
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BD1754HFN-TR Datasheet(HTML) 7 Page - Rohm |
7 / 19 page 7/16 BD1754HFN Datasheet TSZ02201-0G3G0C200060-1-2 9.NOV.2012 Rev.001 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 ●Description of Operations (1) UPIC (= Uni-Port Interface Control) interface BD1754HFN has a single-line digital control interface (UPIC) that can control the power ON/OFF and LED current value through the EN pin. The LED current decreases by one step depending on the number of rising edges. After the number of rising edge is reached to the minimum output current (64 rising edges), the next rising edge changes the output current to the maximum value at startup time. To maintain any output current, the EN pin must be kept at ‘H’ level. To power off, the EN pin must be kept at ‘L’ level for more than 1ms. MAX Current MAX Current EN ILED (Internal) State C64 C63 C62 C61 C62 C60 C2 C1 C64 C63 THI TLO TOFF OFF OFF MIN Current OFF OFF Figure 13. Brightness Control Method EN THI TLO TOFF Figure 14. UPIC Interface By following sequence, UPIC can control current driver for MAX current and OFF state only. Figure 15. UPIC Interface usage for MAX current or OFF only MAX MAX EN ILED (Internal) State C64 C64 TOFF OFF OFF OFF TOFF OFF OFF OFF |
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