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 NXP Semiconductors

  • Automotive Chip-On-Glass LCD Dot Matrix Driver

  • Created: Feb 18, 2015

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The automotive products are quite recognized nowadays. It brings high demand on automotive chip and other related electronic devices. These demands are diverse, which brings difficulties to automotive developers. In this design, users are provided a modifiable firmware using In-System/In-Application Programming (ISP/IAP) via USB. It features the Vertical Alignment (VA) Chip-On-Glass (COG) display module with integrated backlight. The power supply can be done either via USB or an external power supply. This can also be used for an external VLCD that also provide temperature compensation. Its 100 segment and 18 backplanes allow the system to drive up to 1800 elements for graphic display.

The design is comprised of PCA8539DUG 100 x 18 COG automotive LCD dot matrix driver that generates the drive signals for multiplexed LCD, which in this design it is a Passive Matrix Vertically Aligned (PMVA) negative display providing a very dark background with a very wide and symmetric viewing angle. The NX1117CE low-dropout linear regulator is used to provide 3.3V supply for the backlight and the microcontroller. The LPCXpresso low-cost development platform provides the variety of interfaces with respect to the customer designs or needs. It is a highly integrated software development environment for NXP's LPC microcontrollers. The JP1 to JP6 are used to select either the I2C - bus interface, or the SPI interface. They need to be all in the same position. The silk screen indicates which position to use for a given interface. The JP7 is a jumper that connects the VLCDOUT and VLCDSENSE to the VLCDIN pin of the PCA8539. It must be placed if the internal voltage generation is used. The JP9 may not have been soldered into the board during manufacturing. Instead, a 0Ω resistor (R2) is mounted, in parallel with this jumper. Removing the 0Ω resistor and mounting the jumper makes it easy to insert a current meter and measure the current consumption to the VDD pins of the PCA8539. After measurements, a jumper header can be inserted. The PMEG3005CT 500mA low VF dual MEGA Schottky barrier rectifier is used for the polarity and stress protection.

The development in automotive is quite helpful to people. It is use to accomplish task, save lives, and protect people from any type of danger. With this new design of automotive LCD, it is expected that automobiles will be able to optimize its usage and capability to serve people