PC A9 620 NXP 60 x 8 LCD segment driver PCA9620 for automotive & industrial LCD high-drive segment driver for automotive & industrial applications With the PCA9620, NXP expands its proven portfolio of LCD segment drivers into high-end applications. Optimized for use in automotive and demanding industrial applications, it delivers the kinds of features typically associated with larger dot-matrix drivers in a single LQFP80 package. Key features `` AEC-Q100 grade 2 compliant qualification `` Extended operating temp range (-40 to +105 °C) `` Integrated charge pump for on-chip, factory-calibrated ` VLCD voltage generation up to 9.0 V `` Integrated sensor for on-chip VLCD temp compensation and digital temp read-back `` Software-programmable frame frequency: 60 to 300 Hz, step size 10 Hz, factory calibrated `` Software programmable backplane drive configuration: static, 2, 4, 6, or 8 backplane multiplexing `` Software-programmable bias voltage generation: 1/2, 1/3, and 1/4 bias `` Software-programmable inversion scheme for LCD driving waveforms: frame or line inversion `` 480-bit display data RAM to drive up to 480 display elements of any shape including dot matrices and icons `` Software-programmable linear temp compensation of VLCD: 8 different temp slopes, 4 temp regions `` Wide LCD supply range: from 2.5 V for low-threshold LCD up to 9.0 V for high-threshold Twisted Nematic and Vertical Alignment LCD Applications `` Automotive - Instrument cluster - Car radio - Climate control units `` Industrial - Machine control systems - Measuring equipment `` Signage - Information boards - Panels Housed in a single LQFP80 package, this rugged device supports demanding automotive and industrial applications. It has a AEC-Q100 grade 2 compliant qualification, and supports 60 x 8 LCD displays with up to 480 elements. The device can drive almost any LCD with low multiplex rates. It generates the drive signals for static or multiplexed LCD containing up to 8 backplanes, 60 segments, and 480 elements. The PCA9620 is compatible with most microcontrollers and communicates via the two-line bidirectional 400 kHz I2C-bus. Communication overhead is minimized using an on-chip display RAM with autoincremented addressing and display memory switching. The integrated charge pump (booster circuitry) of the PCA9620 permits the programming of any LCD supply voltage in the range from 2.5 to 9.0 V. Therewith, a single (e.g. 3.3 V) external supply allows to generate an LCD supply voltage of up to ` 9.0 V. The corresponding LCD bias voltages are generated by the internal bias voltage generator. regions (parameters MA, MB, MC, and MD), whereas for each coefficient one of eight different slopes can be selected (parameters SLA, SLB, SLC, and SLD). The PCA9620 is specifically designed for driving high display loads at high frame frequencies. To illustrate the driving capability of the PCA9620, two display cell technologies are used as examples: Twisted Nematic and Black Nematic cells. Compared to Twisted Nematic cells, Black Nematic cells have a smaller capacitive load in relation to the display area but should be driven at a higher frame frequency. The PCA9620 features an LCD supply voltage temperature compensation circuitry that makes it possible to automatically offset the temperature dependency of the liquid crystal material. The system is based on a temperature sensor and four equally sized temperature regions. A different temperature coefficient can be applied to each of these As an example, on one hand the PCA9620 is capable of driving a Black Nematic display with a display area of up to 140 cm2. On the other hand, the PCA9620 can also drive a Twisted Nematic display with a display area of up to 35 cm2. Temp regions used for LCD supply voltage temp compensation PCA9620 driving capability SLB SLA SLC SLD TD[7:0] 0h 20h 60h 40h 7Fh VLCD with temperature compensation (V) zero offset at 20 °C MA MB -40 -10 MC 20 MD 79 Temperature (°C) 50 PCA9620 block diagram PCA9620 operating characteristics VLCD BP0 to BP7 S0 to S59 BACKPLANE OUTPUTS DISPLAY SEGMENT OUTPUTS 60 VDD2 LCD VOLTAGE SELECTOR CHARGE PUMP (VOLTAGE MULTIPLIER) DISPLAY CONTROL SCL SDA OUTPUT BANK SELECT LCD BIAS GENERATOR VSS CLK DISPLAY REGISTER TEMPERATURE SENSOR CLOCK SELECT AND TIMING OSCILLATOR POWER-ON RESET INPUT FILTERS A1 2.5 V to 5.5 V LCD supply voltage range 2.5 V to 9.0 V Power-down supply current 1 µA Temperature range -40 °C to +105 °C Frame frequency range 60 Hz to 300 Hz Temperature accuracy ±4 °C DISPLAY RAM PCA9620 PCA9620 ordering information COMMAND DECODER WRITE DATA CONTROL DATA POINTER, AUTO INCREMENT I2C-BUS CONTROLLER A0 Supply voltage range VDD1 Type Package tape and reel Qualification Version PCA9620H LQFP80, plastic low profile quad flat package; 80 leads, body ` 12 x 12 x 1.4 mm AEC-Q100 grade 2 1 T1 T2 T3 www.nxp.com © 2011 NXP Semiconductors N.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The Date of release: May 2011 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and Document order number: 9397 750 17118 may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof Printed in the Netherlands does not convey nor imply any license under patent- or other industrial or intellectual property rights.