NXP Semiconductors OM4068H/2,518

Overview

OM4068H/2,518 from NXP Semiconductors (formerly Philips) is a single-chip CMOS LCD controller/driver supporting static, duplex (1:2), and triplex (1:3) drive modes with up to 32 segment outputs and 3 backplane outputs. It features on-chip LCD bias voltage generation, 2 MHz serial bus interface, and operates from 2.5–5.5 V logic supply and 3.5–6.5 V display supply - enabling low-power battery-operated telecom and portable instrument displays.

For engineers reviewing the OM4068H/2,518 datasheet, OM4068H/2,518 pinout, OM4068H/2,518 application, or OM4068H/2,518 equivalent, key selection criteria include its 32-segment drive capability, selectable multiplex configuration via M0/M1, integrated bias generation eliminating external resistors, and QFP44 package compatibility with space-constrained embedded LCD interfaces.

Technical Context

The OM4068H/2,518 implements a 96-bit cascaded shift register architecture-configurable as 32-, 64-, or 96-bit depending on drive mode (static/duplex/triplex)-with SDOUT enabling daisy-chain expansion. Its internal RC oscillator requires no external components and delivers 116–405 kHz typical frequency, generating an LCD frame rate of 50–175 Hz.

Display latching is synchronized to the internal frame clock, with data held stable during shift operations (SCE HIGH). Backplane outputs BP1–BP3 and segment outputs SEG1–SEG32 are driven with multi-level waveforms matching selected bias (1/2 or 1/3) and multiplex rate, while power-on reset initializes all outputs to VSS and places SDOUT in logic-0 state for safe cascading.

Key Specifications

Pinout & Package

OM4068H/2,518 is supplied in a plastic quad flat package (QFP44), body size 10 × 10 × 1.75 mm, lead count 44, lead pitch 0.8 mm (SOT307-2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCF8576D/1,118 and HD44102F-10, OM4068H/2,518 offers superior integration via on-chip bias generation and native serial cascade support, reducing component count and layout complexity - especially valuable in compact portable and automotive displays.

Availability

OM4068H/2,518 is available at Aetrix Electronics and suitable for telecom equipment, portable instruments, and alarm systems requiring stable component supply across extended product lifecycles.

Supply support for OM4068H/2,518 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 formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The OM4068H/2,518 belongs to NXP's legacy LCD driver product line, designed specifically for low-multiplex-rate character and segmented displays in battery-powered and space-constrained embedded systems.

FAQ

What drive modes does the OM4068H/2,518 support and how are they selected?

The OM4068H/2,518 supports static (1:1), duplex (1:2), and triplex (1:3) LCD drive modes. Selection is performed using the M0 and M1 digital input pins: M1M0 = 01 selects static mode, 10 selects duplex, and 11 selects triplex. These settings configure both the internal shift register length (32/64/96 bits) and the on-chip bias voltage network (1/2 or 1/3 division), ensuring correct waveform generation for each multiplex rate. The OM4068H/2,518 does not require firmware reconfiguration to change drive modes.

Does the OM4068H/2,518 require external components for LCD bias generation?

No, the OM4068H/2,518 integrates an on-chip resistor-divider network with a switchable center tap to generate 1/2 or 1/3 LCD bias voltages automatically based on the selected drive mode. This eliminates the need for external bias resistors or capacitors, reducing BOM cost and PCB area while improving power efficiency. The OM4068H/2,518 only requires decoupling capacitors on VDD and VLCD pins per standard practice.

Can multiple OM4068H/2,518 devices be connected in series for larger displays?

Yes, the OM4068H/2,518 supports serial cascading via its SDOUT pin, which outputs the final bit (D32/D64/D96) of the internal shift register on the falling edge of SCLK. This allows daisy-chaining multiple OM4068H/2,518 units to drive displays exceeding 32 segments - for example, two devices in triplex mode provide 192 total segment outputs. The OM4068H/2,518's SCE pin ensures synchronized latch transfer across the chain.

What is the operating voltage range for the OM4068H/2,518's logic and display supplies?

The OM4068H/2,518 operates with a logic supply (VDD) range of 2.5 V to 5.5 V referenced to VSS, and a separate LCD supply (VLCD) range of 3.5 V to 6.5 V also referenced to VSS. This dual-rail capability allows independent optimization of logic noise immunity and LCD contrast. The OM4068H/2,518 maintains full functionality across this range, including bias generation accuracy and serial interface timing compliance.

How does the OM4068H/2,518 handle power-up sequencing and reset behavior?

Upon power application, the OM4068H/2,518's internal power-on reset block initializes all backplane and segment outputs to VSS (display off), places shift registers and latches in 3-state, sets SDOUT to logic-0, and enters power-down mode. Data transfers must be avoided for ≥0.5 ms after power-on to ensure reset completion. The OM4068H/2,518 remains in power-down until the first rising edge of SCLK, minimizing current draw (<10 µA) during idle periods.