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BD1601MUV Datasheet(PDF) 7 Page - Rohm |
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BD1601MUV Datasheet(HTML) 7 Page - Rohm |
7 / 13 page Technical Note 7/12 www.rohm.com 2011.06 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. BD1601MUV ● Function Description (1) LED driver ▪ UPIC interface BD1601MUV is a single line digital interface control (Uni-port Interface Control=UPIC) that can control the power ON/OFF and LED current value through the EN pin only. The LED current increments by about 0.5mA depending on the number of leading edges. When the number of leading edge is added at the maximum output current of 30mA (64 leading edges), the current is almost equal to 0.5mA 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 640µsec. EN ILED (Internal) State C1 C2 C3 C4 C3 1.4mA 1.4mA 1.9mA C5 30mA 29.5mA C63 C64 Soft Start 0.5mA 2.3mA 0.9mA C1 C2 THI TLO TOFF OFF OFF Fig.16 Brightness Control Method EN THI TLO TOFF Fig.17 UPIC Interface ▪ LED current level The LED current state can be changed by the EN control signal. When the current level is Cn, the basic LED current (ILED) can be obtained from the following expression (where, n indicates a state number). ILED = 30 / 64 ×n [mA] State Output current [mA]] State Output current [mA] State Output current [mA] State Output current [mA] C1 0.5 C14 8.0 C33 15.5 C49 23.0 C2 0.9 C18 8.4 C34 15.9 C50 23.4 C3 1.4 C19 8.9 C35 16.4 C51 23.9 C4 1.9 C20 9.4 C36 16.9 C52 24.4 C5 2.3 C21 9.8 C37 17.3 C53 24.8 C6 2.8 C22 10.3 C38 17.8 C54 25.3 C7 3.3 C23 10.8 C39 18.3 C55 25.8 C8 3.8 C24 11.3 C40 18.8 C56 26.3 C9 4.2 C25 11.7 C41 19.2 C57 26.7 C10 4.7 C26 12.2 C42 19.7 C58 27.2 C11 5.2 C27 12.7 C43 20.2 C59 27.7 C12 5.6 C28 13.1 C44 20.6 C60 28.1 C13 6.1 C29 13.6 C45 21.1 C61 28.6 C14 6.6 C30 14.1 C46 21.6 C62 29.1 C15 7.0 C31 14.5 C47 22.0 C63 29.5 C16 7.5 C32 15.0 C48 22.5 C64 30.0 |
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