ELI101-CPW
User’s Manual
12/21/2016
Copyright ©2016,
Future Designs, Inc.
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PWM Control of Backlight
Figure 5. PWM Backlight Control
All ELI products are designed to reduce power consumption when required. To reduce the power
consumption of the backlight/ELI, the user can connect an externally generated Pulse Width
Modulated (PWM) signal to pin 2 of J5. This signal must be between 5KHz and 100KHz. On the ELI
side we softly pull the PWM diming signal to LCD_VDD providing 100% backlight power when no
PWM signal is applied at J5. In the ELI101-CPW, power consumption can be controlled from 1.27W
to 0.43W with the PWM signal.
If the external system is capable of providing the PWM diming signal at 3.3V DC, there is no need to
connect pin 1 to the cable. ELI provides this signal when the external system needs this voltage to
generate the PWM diming signal.