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AS1101 数据表(PDF) 8 Page - ams AG |
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AS1101 数据表(HTML) 8 Page - ams AG |
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8 / 13 page ![]() www.austriamicrosystems.com Revision 1.3 8 - 13 AS1101, AS1102, AS1103, AS1104 austriamicrosystems Data Sheet Setting the LED Current 7.1 Setting the LED Current The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled by VSET and RSET (see Figure 4) according to the formula: For VSET = 3V and a specific LED current, the RSET value can be determined using the diagram shown in Section 6 Typical Performance Characteristics on page 5. For any other option, the value of ISET can be determined using the graph “ISET vs. VCTRL” on page 7. LED Brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal. ILED = OCMR x (VSET - VCTRL) RSET (EQ 1) |
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