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A6281 Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A6281 Datasheet(HTML) 5 Page - Allegro MicroSystems |
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5 / 11 page  3-Channel Constant Current LED Driver with Programmable PWM Control A6281 5 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 15 16 31 CI (External Clock) SDI (Serial Data In) SDO (Serial Data Out) LI (Latch In) LO (Latch Out) D31 D29 D28 D27 D26 D25 D24 D23 D16 D15 D0 D31 Don’t Care tw(CLK) t SU(D) tH(D) t P(SDO) tSU(LI) tH(LI) tP(IO) D30 PWM Counter OEI (Output Enable Input) OEO (Output Enable Output) IOUT0 IOUT1 IOUT2 Brightness Data= 0 Brightness Data= 1 Brightness Data = 1022 tP(IO) tw(OE) tP(OE) tP(OUT) tP(OUT) tP(OUT) Internal Oscillator or CI (External Clock) 0 1 2 1023 0 0 X T1 T2 TN 1 2 Outputs Off Outputs On 0 1 2345678 Figure 2. Serial Port Timing Figure 3. PWM Counter and Output Timing |
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