NXP Semiconductors PCF2112CP/F1,112

Overview

PCF2112CP/F1,112 from NXP Semiconductors is a single-chip CMOS LCD driver IC designed for 1:1 multiplexed segment displays. It supports 32 LCD segments, operates from 2.25 V to 6.0 V supply, features C-bus serial interface with built-in oscillator, and delivers low quiescent current (20–30 µA at 25 °C). It is used in battery-powered instrumentation panels requiring compact, low-power display control.

For engineers reviewing the PCF2112CP/F1,112 datasheet, PCF2112CP/F1,112 pinout, PCF2112CP/F1,112 application, or PCF2112CP/F1,112 equivalent, key selection criteria include its 32-segment drive capability, 1:1 multiplex architecture, VSO40 40-pin package, C-bus timing compliance, and standalone operation without external clock source.

Technical Context

The PCF2112CP/F1,112 implements a 34-bit C-bus shift register with latch control via CLB pulse (35th edge), enabling full 32-segment + 2-backplane data loading in one frame. Its internal oscillator eliminates need for external crystal, and bus control logic validates leading-zero detection and bit-count integrity before latching.

Unlike PCF2111C, it lacks dual backplane latching (BP1/BP2) - all 32 segment outputs and two backplane outputs (BP1, BP2) are updated synchronously per load pulse. Expansion mode requires master-slave configuration using OSC-to-VSS connection, but PCF2112C functions only as master for identical parts.

Key Specifications

Pinout & Package

PCF2112CP/F1,112 is housed in a plastic very small outline package (VSO40) with 40 leads, body width 5.4 mm, pitch 0.5 mm (SOT158-1). Pin numbering follows standard counterclockwise orientation from index mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCF2112CP/F1,112, PCF2111CT/1,112 offers greater segment density at the cost of multiplex complexity and higher peak current, while PCF2100CT/F1,112 trades pin count reduction for reduced static drive fidelity and non-interchangeable timing control.

Availability

PCF2112CP/F1,112 is available at Aetrix Electronics and suitable for industrial panel meters, portable medical devices, and automotive cabin displays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for PCF2112CP/F1,112 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCF21xxC family was engineered specifically for ultra-low-power, single-chip LCD driving in space-constrained, battery-operated instrumentation - prioritizing integrated timing, minimal external components, and robust serial interface reliability.

FAQ

What is the function of the OSC pin on the PCF2112CP/F1,112?

The OSC pin on the PCF2112CP/F1,112 serves as the oscillator input. When connected to VSS, it enables the internal oscillator, eliminating need for external timing components. If left floating or driven externally, the internal oscillator is disabled and an external clock must be supplied - though the PCF2112CP/F1,112 is designed for standalone operation using its built-in oscillator.

Does the PCF2112CP/F1,112 support daisy-chaining with other LCD drivers?

Yes, the PCF2112CP/F1,112 supports expansion in master-only mode: connecting its OSC pin to VSS configures it as a master, allowing synchronization of multiple PCF2112CP/F1,112 units. However, it cannot operate as a slave - only identical PCF2112C variants may be chained, and no cross-family chaining (e.g., with PCF2111C) is supported per the datasheet.

What is the maximum display frequency achievable with the PCF2112CP/F1,112?

The PCF2112CP/F1,112 achieves a maximum display frequency of 50 Hz under specified conditions (CO = 1.5 nF, VDD = 5 V). This value drops to 30 Hz at minimum VDD (2.25 V) and rises to 35 Hz at typical VDD (5 V), as confirmed in Figure 15 of the datasheet - making it suitable for static LCDs requiring stable, low-flicker operation.

How does the C-bus interface of the PCF2112CP/F1,112 differ from I²C or SPI?

The C-bus interface of the PCF2112CP/F1,112 is a proprietary 3-wire serial protocol (DATA, DLEN, CLB) distinct from I²C or SPI. It uses edge-triggered load pulses (35th CLB edge), built-in bit-count validation, and no address byte - reducing MCU overhead. Unlike SPI, it has no clock polarity/phase configuration; unlike I²C, it requires no pull-ups or arbitration logic.

Is the PCF2112CP/F1,112 pin-compatible with other members of the PCF21xxC family?

No, the PCF2112CP/F1,112 is not pin-compatible with PCF2100C (SO28, 28-pin) or PCF2111C (VSO40, 40-pin but different pin mapping). Although all three use SOT158-1 for PCF2111C/PCF2112C, their pin functions differ significantly - e.g., PCF2111C reserves pins 37–38 for n.c./BP, while PCF2112CP/F1,112 assigns them to BP1/BP2. Direct replacement requires PCB redesign.