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AN2841 Arkusz danych(PDF) 7 Page - STMicroelectronics |
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AN2841 Arkusz danych(HTML) 7 Page - STMicroelectronics |
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7 / 31 page  AN2841 Description of LED dimming 7/31 Figure 2. PWM serial-parallel conversion for multiple LED applications Figure 3. Example of a specific lighting setting The following equation is used to determine how many LEDs can used in an application with specific maximum SPI speed and PWM resolution requirements: Equation 1 where; N is the maximum number of LEDs fSPI is the SPI communication speed n is the PWM resolution fPWM is the dimming frequency SERIAL DATA Output 1- (LED1) Output 2-(LED2) Output 3-(LED3) Output 4-(LED4) 1111 t t t t t 4% duty cycle 14% duty cycle 3% duty cycle 99% duty cycle LEVELS T PWM 1101 0101 0001 0000 1111 or new data T SEND_DATA PARALLELDATA AM00343 PWM n SPI f f N 2 = |
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