NXP Semiconductors PCF2112CT/1,112

Overview

PCF2112CT/1,112 from NXP Semiconductors is a single-chip CMOS LCD driver IC designed for 1:1 multiplexed segment displays, supporting 32 LCD segments and operating from 2.25 V to 6.0 V supply. It features a built-in oscillator, C-bus serial interface (CLB/DLEN/DATA), and standalone operation without external timing components. It is used in battery-powered instrumentation panels requiring low-power, compact display driving.

For engineers reviewing the PCF2112CT/1,112 datasheet, PCF2112CT/1,112 pinout, PCF2112CT/1,112 application, or PCF2112CT/1,112 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for industrial and portable LCD systems.

Technical Context

The PCF2112CT/1,112 implements a 34-bit C-bus shift register with latch control via CLB pulse 35, enabling full 32-segment data transfer in one cycle. Its internal oscillator eliminates external crystal requirements, and its 1:1 multiplex architecture simplifies drive waveform generation for static or low-duty LCDs.

Bus control logic performs leading-zero detection, bit-count validation, and signal integrity checks on DLEN and DATA lines - rejecting corrupted frames without latching. The device supports expansion only as a master unit for identical PCF2112C slaves via BP synchronization.

Key Specifications

Pinout & Package

PCF2112CT/1,112 uses the VSO40 (SOT158-1) plastic very small outline package: 40-pin, 0.5 mm pitch, body width 5.4 mm, lead-to-lead width 10.0 mm, and 1.2 mm max height - optimized for high-density PCB layouts in space-constrained instruments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCF2111CT/1,112 and PCF2100CT/F1,112, the PCF2112CT/1,112 uniquely supports 1:1 multiplexing with 32 segments in the compact VSO40 package - making it optimal for static or low-duty-ratio LCDs where minimal external components and ultra-low standby current are critical.

Availability

PCF2112CT/1,112 is available at Aetrix Electronics and suitable for industrial panel meters, portable medical devices, and smart energy meters requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for PCF2112CT/1,112 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 low-power, single-chip LCD driving in battery-operated and space-constrained instrumentation - emphasizing integrated timing, robust serial control, and extended temperature operation.

FAQ

What is the maximum display frequency supported by the PCF2112CT/1,112?

The PCF2112CT/1,112 supports a maximum display frequency of 50 Hz when VDD = 5 V and load capacitance CO = 1.5 nF, as specified in Table 7 of the datasheet. This frequency is optimized for standard static or low-duty-ratio LCD glass to prevent flicker while maintaining low power consumption. Operation above 50 Hz is not guaranteed and may cause incomplete segment charging or increased current draw.

Does the PCF2112CT/1,112 require an external crystal or RC network?

No, the PCF2112CT/1,112 does not require an external crystal or RC network. Its one-point built-in oscillator is enabled by connecting the OSC pin to VSS, providing a stable timing source for LCD refresh and internal logic. External oscillation is disabled by default and only possible if OSC is driven - a configuration not supported in standard operation per the functional description.

How many LCD segments can the PCF2112CT/1,112 drive, and what is its multiplex configuration?

The PCF2112CT/1,112 drives exactly 32 LCD segments in a 1:1 multiplex configuration, meaning each segment is driven independently without time-division sharing. This architecture eliminates the need for external bias resistors or complex waveform generation, making it ideal for static or low-duty-ratio LCD modules used in instrumentation and portable devices.

What package type is used for the PCF2112CT/1,112, and what are its key mechanical dimensions?

The PCF2112CT/1,112 uses the VSO40 package (SOT158-1): a 40-pin plastic very small outline package with 0.5 mm lead pitch, 5.4 mm body width, 10.0 mm lead-to-lead width, and maximum height of 1.2 mm. These dimensions enable high-density placement on compact PCBs common in handheld and panel-mounted equipment.

Can the PCF2112CT/1,112 be used in master-slave expansion configurations?

Yes, the PCF2112CT/1,112 can operate exclusively as a master unit in expansion systems, synchronizing up to multiple PCF2112C slave devices via BP signal routing. As stated in Figure 11 and Section 7.7, it cannot function as a slave - expansion requires identical PCF2112C units, and the master's BP outputs drive slave OSC inputs to align display timing across all units.