PCF8551ATT/AY

Display Drivers Overview

The PCF8551ATT/AY is a universal LCD segment driver manufactured by NXP Semiconductors, housed in a 48-TSSOP package. It supports static or multiplexed backplane configurations with bias voltages of 1/2 or 1/3. The device accommodates up to 144 segments, including 18 seven-segment digits or nine alphanumeric characters. It features an SPI interface and operates on independent V_LCD and V_DD supplies ranging from 1.8V to 5.5V. Internal circuitry generates LCD bias voltage via a buffer.

Display Drivers Feature Summary

• Supports flexible display configurations including static, 2/3/4-backplane multiplexing, and various bias options.
• Integrates internal LCD bias voltage generation with buffering for stable drive signals.
• Features automatic incrementing display data loading to reduce communication overhead.
• Offers multiple blinking modes and independent power supply domains for logic and LCD.

Display Drivers Applications

• Consumer electronics displays
• Industrial instrumentation panels
• Medical device interfaces

Display Drivers Procurement Notes

Verify the specific suffix 'AY' against official NXP documentation to confirm it denotes the tape-and-reel packaging variant. Ensure compatibility with existing PCB footprints for the 48-TSSOP package. Confirm that the SPI interface requirements align with the host microcontroller's capabilities before finalizing procurement.

Display Drivers Selection Notes

Select this component when designing systems requiring support for up to 144 LCD segments with low power consumption. It is suitable for applications needing independent control over LCD and logic supply voltages within the 1.8V to 5.5V range. Consider the SPI interface speed and the internal bias generation capabilities when evaluating system architecture constraints.

Display Drivers Part Context

This part belongs to the PCF8551 family of universal LCD segment drivers from NXP Semiconductors. The family includes variants with different interfaces, such as I2C (PCF8551A) and SPI (PCF8551B). The PCF8551ATT/AY specifically utilizes the SPI interface for high-speed communication and is packaged in a thin-shrink small outline package.

Display Drivers Replacement Considerations

The PCF8551BTT/AJ is listed as a discontinued direct substitute for similar PCF8551 variants. Verify if the PCF8551BTT/AY serves as a current alternative. Cross-reference pinouts and electrical specifications with official datasheets to ensure functional equivalence.