1. general description the PCF8534 is a peripheral device which interfaces to almost any liquid crystal display (lcd) with low multiplex rates. it generates the drive signals for any static or multiplexed lcd containing up to four backplanes and up to 60 segments and can easily be cascaded for larger lcd applications. the PCF8534 is compatible with most microprocessors / microcontrollers and communicates via a two-line bidirectional i 2 c-bus. communication overheads are minimized using a display ram with auto-incremented addressing, hardware subaddressing and display memory switching (static and duplex drive modes). 2. features PCF8534 universal lcd driver for low multiplex rates rev. 00.05 ? 20 february 2007 preliminary datasheet ? single-chip lcd controller / driver ? selectable backplane drive configuration: static or 2 / 3 / 4 backplane multiplexing ? selectable display bias configuration: static, 1 ? 2 or 1 ? 3 ? internal lcd bias generation with voltage-follower buffers ? 60 segment drives: up to thirty 8-segment numeric characters; up to sixteen 15-segment alphanumeric characters; or any graphics of up to 240 elements ? 60 x 4-bit ram for display data storage ? auto-incremented display data loading across device subaddress boundaries ? display memory bank switching in static and duplex drive modes ? versatile blinking modes ? lcd and logic supplies may be separated ? wide power supply range: from 1.8to5.5v ? wide lcd supply range: from 2.5 v for low threshold lcds and up to 6.5 v for guest-host lcds and high threshold (automobile) twisted nematic lcds ? low power consumption ? 400 khz i 2 c-bus interface ? ttl/cmos compatible ? compatible with 4-bit, 8-bit or 16-bit microprocessors/microcontrollers ? may be cascaded for 2 lcd applications ? no external components ? manufactured in silicon gate cmos process.
PCF8534_0 ? nxp b.v. 2007. all rights reserved. preliminary datasheet rev. 00.05 ? 20 february 2007 2 of 40 nxp semiconductors PCF8534 universal lcd driver for low multiplex rates 3. ordering information table 1. ordering information type number topside mark package name description version PCF8534h PCF8534h lqfp80 plastic, low profile, quad flat package; 80 leads; body 12 x 12 x 1.4 mm sot315-1
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