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MIC2860_D Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC2860_D Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 12 page Micrel Inc. MIC2860-2D July 2010 9 M9999-072010-A 33µs (tSTART_UP) after the SC pin is first pulled high at the maximum brightness level 1. After start up, the internal control logic is ready to decrease the WLED brightness upon receiving programming pulses (positive edges applied to SC pin). The brightness level can be decreased one level by applying a single programming pulse as shown in Figure 5. Brightness settings can be quickly changed by sending programming pulses one after each other. Each programming pulse has a high (tPROG_HIGH) and a low (tPROG_LOW) pulse width that must be between 0.3µs to 75µs. Counter Roll-Over The MIC2860-2D internal counter contains registers from 0 to 31 (32 levels). When the brightness level is at 32 (minimum brightness) and a programming pulse forces the brightness to step down, the counter will roll- over to level 31 (maximum brightness). This is illustrated in Figure 7. Figure 7. Down Counter Roll-Over Input Capacitor The MIC2860-2D is a high performance, high bandwidth device. Stability can be maintained using a ceramic input capacitor of 1µF. Low ESR ceramic capacitors provide optimal performance at a minimum amount of space. Additional high-frequency capacitors, such as small valued NPO dielectric type capacitors, help filter out high frequency noise and are good practice in any noise sensitive circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore not recommended. Figure 5. Brightness Programming Pulses Multiple brightness levels can be changed as shown in Figure 6. When issuing multiple brightness level adjustments to the SC pin, ensure both tPROG_LOW and tPROG_HIGH are within 0.3µs and 75µs. To maintain operation at the current brightness level simply maintain a logic level high at the SC pin. Figure 6. Consecutive Brightness Level Commands The MIC2860-2D can be programmed to set WLED drive current to produce one of 32 distinct brightness levels. The following section explains how the brightness counter functions with continued programming edges. |
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