Team,
is there a way to track the operating hours of the LED (meaning the LED on-time) when using the DLPC350?
Thanks!
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Team,
is there a way to track the operating hours of the LED (meaning the LED on-time) when using the DLPC350?
Thanks!
Hello Hagen,
You should be able to use the three LED output enable signals (LEDR_EN, LEDG_EN, and LEDB_EN). Whenever these are active the corresponding LED will be on. The PWM signals are just used to control LED current. Is that something that also needs to be tracked? You could also measure the LED current across R210 as shown in the Red LED Driver schematic below. The full reference design for the DLPC350 is at www.ti.com/.../dlp4500-c350ref
Thanks,
Kyle
Hello Kyle,
the DLPC350 has two PWM input channels (GPIO_5, GPIO_6), which can capture a (pwm) signal. One of these channels I want to use for counting the high and low time of the LED_EN. I would route the LED_EN to the GPIO_5 on pcb.
Best,
Hagen
Hello Kyle,
yes we want to keep track of LED on time for purpose of LED lifetime. Because of the unknown behaviour of the pwm input capture we decided to calculate it in software only.
Many thanks for your support.
Best regards,
Hagen