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VD5377 Fiches technique(PDF) 46 Page - STMicroelectronics |
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VD5377 Fiches technique(HTML) 46 Page - STMicroelectronics |
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46 / 88 page ![]() Additional features VD5377 46/88 Doc ID 022952 Rev 2 7.3.1 PWM operation The following list is a summary of PWM operation (Figure 19). • The PWM block is clocked by the internal 50 kHz oscillator which means in STANDBY state in MANUAL power mode and in SLEEP states in AUTOMATIC power mode the backlight LEDs are still running. • Maximum LED period is 5.12 ms (256 x OSC50K clock period). • Programmable pulse width (from 0 to 5.12 ms). • BACKLED pulses can be “gated” or “delayed” during the tracking LED “on” time to avoid interference with the tracking function. This should not be required if the BACKLED are shielded. Note: No test is performed on pulsehigh value versus period value so the host must ensure that pulsehigh < period. Figure 19. PWM operation: three independent PWM channels backled_en Osc 50kHz period period period pulsehigh1 pulsehigh0 pulsehigh2 pwm0 pwm1 pwm2 |
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