PCF8566TS Universal LCD Driver for Low-Multiplex Displays

The PCF8566TS is a versatile and highly integrated peripheral driver designed specifically for controlling low-multiplex liquid crystal displays (LCDs). This CMOS device provides a complete solution for systems requiring a simple and efficient interface to drive LCD segments, making it particularly suitable for a wide range of consumer, industrial, and automotive applications where low power consumption and simplicity are paramount.

A key feature of the PCF8566TS is its ability to drive up to 96 segments in various static or multiplexed configurations, including 1:1 (static), 1:2, 1:3, and 1:4 multiplex modes. This flexibility allows it to support a broad spectrum of display sizes and complexities, from simple numeric readouts to more complex custom symbols. The device communicates with a controlling microcontroller or processor via a standard two-line I²C-bus interface, minimizing the number of GPIO pins required and simplifying the overall system design. This serial interface supports bidirectional data transfer and allows multiple devices to be connected to the same bus, enabling the control of complex display systems.

The integrated generation of the LCD supply voltage (VLCD) is another significant advantage. The PCF8566TS features an on-chip low-ripple charge pump, which can be configured for different voltage levels. This eliminates the need for an external negative voltage supply, reducing both the component count and the overall board space. The driver's extremely low power consumption extends battery life in portable devices, a critical design consideration for modern electronics.

Internally, the device contains a display RAM that stores the current state of all segments. The microcontroller simply writes data to this RAM via the I²C-bus, and the PCF8566TS autonomously refreshes the display, freeing up the host processor for other tasks. Its design ensures excellent legibility and contrast across a wide temperature range, making it reliable even in demanding environments.

In summary, the PCF8566TS stands out as a robust and efficient solution for adding display functionality to embedded systems. Its combination of a simple serial interface, integrated power supply, and flexible segment driving capability makes it an excellent choice for designers.

ICGOODFIND: A versatile and power-efficient LCD driver ideal for simplifying design and reducing system cost in low-multiplex display applications.

Keywords: LCD Driver, I²C-bus Interface, Low Power Consumption, Charge Pump, Multiplex Displays