1. general description the pcf8538 is a fully feat ured chip-on-glass (cog) 1 liquid crystal display (lcd) driver, designed for high-contrast vertical a lignment (va) lcd with mu ltiplex rates up to 1:9. it generates the drive signals for a static or multiplexed lcd containing up to 9 backplanes, 102 segments, and up to 918 elements. the pcf8538 features an internal charge pump with internal capacitors for on-chip generation of the lcd driving voltage. to ensure an optimal and stable contrast over the full temperature range, the pcf8538 offers a programmable temperature compensation of the lcd supply voltage. the pcf8538 can be easily controlled by a microc ontroller through either the two-line i 2 c-bus or a four-line bidirectional spi-bus. for a selection of nxp lcd segment drivers, see table 61 on page 102 . 2. features and benefits ? low power consumption ? 102 segments and 9 backplanes allowing to drive: ? up to 114 7-segment numeric characters ? up to 57 14-segment alphanumeric characters ? any graphics of up to 918 elements ? 918-bit ram for display data storage ? two sets of backplane outputs providing hi gher flexibility for optimal cog layout configurations ? up to 4 chips can be cascaded to drive larger displays with an internally generated or externally supplied v lcd ? selectable backplane drive configuration: stat ic, 2, 4, 6, 8, or 9 backplane multiplexing ? lcd supply voltage ? programmable internal charge pump for on-chip lcd voltage generation up to 5 ? v dd2 ? external lcd voltage su pply possible as well ? selectable 400 khz i 2 c-bus or 6.5 mhz spi-bus interface ? selectable linear temperature compensation of v lcd ? selectable display bias configuration ? wide range for digital and analog power supply: from 2.5 v to 5.5 v ? wide lcd voltage range from 4.0 v for low threshold lcds up to 12.0 v for high threshold twisted nematic and ve rtical alignment (va) displays ? display memory bank switching in st atic, duplex, and quadruplex drive modes pcf8538 universal 102 x 9 chip-on- glass lcd segment driver rev. 1 ? 18 december 2013 product data sheet 1. the definition of the abbreviations and acronyms used in this data sheet can be found in section 19 on page 105 .
pcf8538 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 1 ? 18 december 2013 2 of 113 nxp semiconductors pcf8538 universal 102 x 9 chip-on-glass lcd segment driver ? programmable frame frequency in the range of 45 hz to 300 hz; factory calibrated with a tolerance of ? 3 hz (at 80 hz) ? selectable inversion scheme for lcd driving waveforms: frame or n-line inversion ? diagnostic features for status monitoring ? integrated temperature sensor with temperature readout ? on chip calibration of intern al oscillator frequency and v lcd 3. applications ? consumer ? medical and health care ? measuring equipment ? machine control systems ? information boards ? white goods ? general-purpose display modules
pcf8538 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 1 ? 18 december 2013 3 of 113 nxp semiconductors pcf8538 universal 102 x 9 chip-on-glass lcd segment driver 4. ordering information 4.1 ordering options [1] bump hardness, see table 59 on page 99 . table 1. ordering information type number package name description version PCF8538UG bare die 247 bumps PCF8538UG table 2. ordering options product type number sales item (12nc) orderable part number ic revision delivery form PCF8538UG/2da/1 935303337033 PCF8538UG/2da/1z 1 chips with bumps [1] in tray
pcf8538 all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 1 ? 18 december 2013 4 of 113 nxp semiconductors pcf8538 universal 102 x 9 chip-on-glass lcd segment driver 5. block diagram fig 1. block diagram of pcf8538 d d d / & |