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VD5377 bảng dữ liệu(PDF) 46 Page - STMicroelectronics

tên linh kiện VD5377
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VD5377 bảng dữ liệu(HTML) 46 Page - STMicroelectronics

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Additional features
VD5377
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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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