PCA8546ATT/AJ

Display Drivers Overview

The PCA8546ATT/AJ is an automotive-grade LCD segment driver manufactured by NXP Semiconductors. It functions as a single-chip controller and driver for up to 176 display elements, supporting multiplex rates of up to 1:4. The device features a two-wire bidirectional I²C bus interface with a maximum clock frequency of 400 kHz. It operates within a digital power supply range of 1.8 V to 5.5 V and supports LCD power voltages from 2.5 V to 9 V. The component includes on-chip RAM for display data storage and allows for separate LCD and logic power supplies.

Display Drivers Feature Summary

• Complies with AEC-Q100 Grade 3 standards for automotive electronic applications
• Integrates a 400 kHz I²C bus interface for communication with microcontrollers
• Supports flexible display configurations including alphanumeric characters and graphics

Display Drivers Applications

• Automotive air conditioning system displays
• Car radio user interfaces
• Vehicle instrument cluster panels

Display Drivers Procurement Notes

Verify the specific ordering suffix (AJ) against the latest official datasheet to confirm package orientation and pinout compatibility. Confirm that the design utilizes the I²C interface variant rather than the SPI-based B-series. Check current product status notifications, as this part may be subject to end-of-life policies or recommended replacements like the PCF8553DTT/A. Ensure the application environment remains within the specified -40°C to +95°C operating temperature range.

Display Drivers Selection Notes

Select this component when designing automotive displays requiring low multiplex rates and I²C connectivity. It is suitable for systems needing support for up to four backplanes and 176 segments. Consider alternatives such as the PCA8546BTT if SPI communication is required instead of I²C. Evaluate the PCF8553DTT/A for newer designs seeking updated long-term supply support. Ensure the voltage requirements for both logic and LCD drivers align with the specified operational ranges.

Display Drivers Part Context

The PCA8546ATT/AJ belongs to the PCA854x family of automotive-grade cased LCD segment drivers. This series provides form, fit, and function compatibility across variants differing primarily in communication interfaces. The ATT suffix denotes the I²C interface version, distinguishing it from the BTT series which utilizes SPI. These drivers are engineered for reliability in harsh automotive environments, adhering to strict quality standards defined by AEC-Q100.

Display Drivers Replacement Considerations

NXP recommends using PCF8553DTT/A or PCA85276ATT/A for new designs. The PCA8546ATT and PCA8546BTT will continue production until existing inventory is exhausted.