AN3467| Application Note
Maxim/Dallas > App Notes > DIGITAL POTENTIOMETERS
DISPLAY DRIVERS
Keywords: LCD drivers, SMBus, I/O expanders, digital potentiometers, stepup converters
Jan 31, 2005
APPLICATION NOTE 3467
SMBus I/O Expander Controls LCD Bias Voltage
A circuit consisting of an SMBusTM I/O expander, step-up converter, and digital potentiometer enables the SMBus to control the contrast of an LCD. Small, handheld, battery-powered devices often feature an LCD panel and a microcontroller with limited I/O pins. The SMBus is useful for controlling system functions under limited I/O and, for convenience, it should also be able to control the LCD contrast. In Figure 1, this task is accomplished with an SMBus I/O expander (IC2), a step-up converter (IC1), and a digital potentiometer (IC3).
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