NXP Semiconductors PCF8576CU/2/F2,026

Overview

PCF8576CU/2/F2,026 from NXP Semiconductors is a bare-die LCD controller and driver IC supporting static or multiplexed LCDs with up to 4 backplanes and 40 segments. It communicates via I²C-bus, integrates internal LCD bias generation, supports 1:1 to 1:4 multiplexing, and operates from 2 V to 6 V logic/LCD supply. It enables compact, low-power display interfaces in battery-operated instrumentation.

For engineers reviewing the PCF8576CU/2/F2,026 datasheet, PCF8576CU/2/F2,026 pinout, PCF8576CU/2/F2,026 application, or PCF8576CU/2/F2,026 equivalent, key selection criteria include its 40×4-bit display RAM, selectable 1/2 or 1/3 LCD bias, power-saving mode, cascading capability for >160-element displays, and compatibility with microcontrollers using standard I²C protocol.

Technical Context

The PCF8576CU/2/F2,026 implements a synchronous LCD drive architecture with an internal oscillator (enabled by OSC–VSS) or external clock input (OSC–VDD), generating frame frequencies of 69 Hz (normal mode) or 65 Hz (power-saving mode). Its display RAM auto-increment logic adapts to drive mode: +8 per byte in static, +4 in 1:2, +3 in 1:3, and +2 in 1:4 multiplexing.

It uses hardware subaddressing (A0–A2) for cascaded device selection and includes SYNC pin for inter-device timing coordination. Backplane outputs (BP0–BP3) are dynamically configured per selected multiplex ratio, and segment outputs (S0–S39) drive LCD elements directly without external components.

Key Specifications

Pinout & Package

Bare die package: 56-bump flip-chip, 3.2 mm × 2.92 mm × 0.40 mm, substrate connected to VDD and requiring electrical isolation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD controller and driver applications.

Compared with PCF8576CU/2/F2,026, the PCF8576CHL/1 provides mechanical robustness and thermal dissipation in a standard QFP, while the PCF8576CT/1 delivers compact SMT integration without bare-die handling - both retain identical display RAM, I²C behavior, and bias generation, making them functionally interchangeable at the system level when package constraints allow.

Availability

PCF8576CU/2/F2,026 is available at Aetrix Electronics and suitable for portable instrumentation, industrial panel meters, smart energy meters, and medical device status displays requiring stable component supply and long-term lifecycle support.

Supply support for PCF8576CU/2/F2,026 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCF8576C product line delivers integrated LCD controller/drivers optimized for low-multiplex-rate segment displays in cost-sensitive, low-power embedded systems - targeting instrumentation, utility meters, and portable electronics.

FAQ

What is the maximum LCD element count supported by the PCF8576CU/2/F2,026?

The PCF8576CU/2/F2,026 supports up to 160 LCD elements (40 segments × 4 backplanes) in a single device. When cascaded using the SYNC pin and subaddressing (A0–A2), up to 2560 elements are achievable across multiple PCF8576CU/2/F2,026 or compatible devices - confirmed in Section 1 and Table 5 of the NXP datasheet Rev. 13.

Does the PCF8576CU/2/F2,026 require external components for basic LCD operation?

No - the PCF8576CU/2/F2,026 requires no external components for core LCD driving. Its internal bias generator, oscillator, and display RAM eliminate the need for external resistors, capacitors, or crystals. Only VDD, VSS, VLCD, and the LCD panel itself are mandatory connections, as stated in Section 2 "Features and benefits" and Section 7.2.

How does the PCF8576CU/2/F2,026 handle I²C communication in cascaded configurations?

In cascaded setups, the PCF8576CU/2/F2,026 uses hardware subaddressing (A0–A2 pins) to filter incoming I²C writes - only data matching the internal subaddress counter is stored in display RAM. The SYNC pin ensures synchronized frame timing across devices, and auto-incremented addressing wraps correctly at device boundaries, as detailed in Sections 6.2 and 7.13.

What LCD bias configurations does the PCF8576CU/2/F2,026 support, and how are they selected?

The PCF8576CU/2/F2,026 supports static, 1/2, and 1/3 LCD bias configurations. Selection is made via command register settings (mode-set command, Table 10), which configure the internal voltage divider. The 1/2 bias option uses a switched resistor to bypass the center tap; 1/3 uses the full three-resistor chain - described in Section 7.3 and Table 6.

Can the PCF8576CU/2/F2,026 drive a static LCD with only one backplane?

Yes - the PCF8576CU/2/F2,026 fully supports static (1:1) drive mode. In this configuration, all four backplane outputs (BP0–BP3) carry identical waveforms and may be paralleled for higher drive strength, while segment outputs S0–S39 drive individual LCD elements. This is explicitly covered in Section 7.4.1 and Table 5.