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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3661 датащи(PDF) 21 Page - ams AG |
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AS3661 датащи(HTML) 21 Page - ams AG |
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21 / 87 page  www.austriamicrosystems.com Revision 1.3 20 - 85 AS3661 Datasheet - D e t a i l e d D e s c r i p t i o n 8.7 LED Driver Operational Description AS3661 LED drivers are constant current sources. The output current can be programmed by control registers up to 25.5 mA. The overall maximum current is set by 8-bit output current control registers with 100 µA step size. Each of the 9 LED drivers has a separate output current control register. The LED luminance pattern (dimming) is controlled with PWM (pulse width modulation) technique, which has internal resolution of 12 bits (8-bit control can be seen by user). PWM frequency is 312 Hz (see Figure 23 on page 20). Figure 23. LED Pattern and Current Control Principle LED dimming is controlled according to a logarithmic or linear scale(see Figure 24). Logarithmic or linear scheme can be set for both the program execution engine control and direct PWM control. Figure 24. Logarithmic vs. Linear Dimming Note: If the temperature compensation is active, the maximum PWM duty cycle is limited to 50% at +25°C. This is required to allow enough headroom for temperature compensation over the whole temperature range -40 °C to 90°C. 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 0 64 128 192 256 Dimming Control [DEC] linear PWM logarithmic PWM |
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