Lavatory Dispensing System

In general, lavatory appliances are subdivided into the following categories:

• Lavatory Flushers
• Lavatory Faucets
• Soap Dispenser
  

The diagram below represents the general operation of all three applications using proximity detection and ultra-low power MCUs. Toilet flushers generally aim to detect the presence of a human body, while faucets and soap dispensers are designed to detect the presence of hands within 10 cm of the system.

The combination of the C8051F9xx low-power MCU and the Si1141 proximity and ambient light sensor can provide significant power reduction in lavatory appliances. The Si1141’s high ADC sensitivity and flexible current sink capability provide the ability to adapt to different systems using a single hardware design and can change the parameters to best suit the ambient light conditions. The ultra-lower power of both the C8051F9xx and the Si1141 allow for fast sleep and wake up time.