NXP Semiconductors PCF8576CU/F1,026

Overview

PCF8576CU/F1,026 from NXP Semiconductors is a universal LCD controller and driver IC designed for low-multiplex-rate segment displays. It supports up to 4 backplanes and 40 segments, delivers internal LCD bias generation with selectable 1/2 or 1/3 bias, operates from 2 V to 6 V logic/LCD supply, and communicates via I²C-bus with auto-incremented RAM addressing - enabling direct drive of alphanumeric or graphical LCDs in battery-powered instrumentation.

For engineers reviewing the PCF8576CU/F1,026 datasheet, PCF8576CU/F1,026 pinout, PCF8576CU/F1,026 application, or PCF8576CU/F1,026 equivalent, key selection criteria include static/1:2/1:3/1:4 multiplex compatibility, 40 × 4-bit display RAM architecture, cascading capability via SYNC/CLK, power-saving mode operation, and bare-die wire-bond packaging for embedded module integration.

Technical Context

The PCF8576CU/F1,026 implements a dedicated LCD drive engine with integrated voltage-follower bias buffers and a 40 × 4-bit static display RAM mapped one-to-one with S0–S39 segment outputs and BP0–BP3 backplane outputs. Its timing core derives LCD frame frequency (65 Hz in power-saving mode, 69 Hz nominal) from either internal oscillator (OSC = VSS) or external clock (OSC = VDD), with CLK serving as output or input accordingly.

Hardware subaddressing via A0–A2 enables seamless cascading of multiple devices, while the data pointer auto-increments by 2 (1:4), 3 (1:3), 4 (1:2), or 8 (static) per byte write - ensuring correct RAM fill order aligned to multiplex configuration without host-side address management.

Key Specifications

Pinout & Package

PCF8576CU/F1,026 is supplied as a wire-bond bare die (56 bonding pads, 3.2 × 2.92 × 0.38 mm), intended for flip-chip or wire-bond integration into custom modules. The die shares identical pin functionality with the LQFP64 and VSO56 packaged variants, with all 56 terminals electrically defined and validated per NXP's official pin description table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCF8576CU/F1,026, the PCF8576CHL/1 offers superior thermal performance and mechanical stability in board-level applications, while the PCF8576CT/1 provides a middle-ground SMT solution - neither matches the ultra-compact integration density or module-level customization enabled by the wire-bond bare die form factor of PCF8576CU/F1,026.

Availability

PCF8576CU/F1,026 is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial control panel displays, and smart energy meter displays requiring stable component supply and long-term lifecycle support.

Supply support for PCF8576CU/F1,026 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCF8576C product line was engineered specifically for cost-sensitive, low-power segment LCD interfaces - targeting embedded systems where display reliability, minimal external components, and flexible multiplex support are critical design requirements.

FAQ

What is the package type and mounting method for PCF8576CU/F1,026?

PCF8576CU/F1,026 is supplied as a wire-bond bare die measuring 3.2 × 2.92 × 0.38 mm with 56 bonding pads. It is not a surface-mount component and requires custom integration via wire bonding or flip-chip onto a substrate or module carrier. No solder reflow or pick-and-place is applicable - it is intended for module-level assembly under controlled cleanroom conditions.

Does PCF8576CU/F1,026 support 1:3 multiplex LCDs, and what bias configuration is used?

Yes, PCF8576CU/F1,026 supports 1:3 multiplex LCDs using 1/3 bias configuration. This is confirmed in Table 6 of the datasheet, which specifies 1:3 multiplex with 1/3 bias yielding a discrimination ratio of 1.915. The device selects bias mode via internal register settings, and VLCD voltage is externally applied to set the full-scale LCD operating voltage.

How does the data pointer increment in PCF8576CU/F1,026 during display RAM writes?

The data pointer in PCF8576CU/F1,026 increments automatically after each display data byte write: by 2 addresses in 1:4 multiplex mode, 3 in 1:3, 4 in 1:2, and 8 in static mode. This ensures correct bit placement across RAM rows corresponding to backplane outputs (BP0–BP3), eliminating host software address calculation overhead.

Can PCF8576CU/F1,026 drive a 20-character 7-segment display, and how is segment mapping handled?

Yes, PCF8576CU/F1,026 can drive up to twenty 7-segment alphanumeric characters, as explicitly stated in its features. Each character consumes 7 segments plus decimal point (8 elements), and the 40 segments map across multiple characters using the 40 × 4-bit RAM - with segment outputs S0–S39 assigned sequentially per character per multiplex phase, governed by the RAM filling order shown in Figure 14.

Is an external crystal or resonator required for PCF8576CU/F1,026 operation?

No external crystal or resonator is required. PCF8576CU/F1,026 includes an internal oscillator enabled by connecting the OSC pin to VSS; CLK then outputs the generated clock for cascaded devices. Alternatively, an external clock (≥125 kHz) may be applied to CLK when OSC is tied to VDD - but no passive timing components are needed in either configuration.