Renesas Electronics Corporation
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Low-Cost Digital Instrument Cluster

Overview

Renesas offers a low-cost digital instrument cluster and HVAC display solution using a microcontroller (MCU) and video signal processor (VSP) scaler.

System Benefits

  • Simplified development of multiple display resolutions with a single design
  • Easily scalable cluster graphics for multiple display sizes and resolutions
  • Complete system solution design optimized for power consumption in an automotive environment
  • Generate cluster graphics in one resolution with the RH850 automotive MCU, then easily scale to different resolutions using the RAA278840 LCD controller
  • Use the RAA278840 to upscale 1280x480 resolution primary cluster graphics made for an 8” LCD panel to 1920x720 to support a 12.3” panel upgrade option for premium trim vehicle models
  • Use RAA278840 for "fast boot" to display tell-tale lamps at ignition (<500ms to show on-screen display (OSD) through RAA278840), allowing the MCU software time to boot up properly

Block Diagram

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AS-232 AS232 AS232 AS232 Primary Regulator Primary Regulator Primary Regulator 12V Battery Battery Battery Battery Battery Battery 12V Battery 12V Battery 12V Battery Connector Line.410 Sheet.138 Double arrow.2150 Double arrow.2166 1080 (Max) 1080 (Max) 1080(Max) 1920 (Max) 1920 (Max) 1920 (Max) LVDS (1 OR 2 CH) LVDS (1 OR 2 CH) LVDS (1 OR 2 CH) Connector Arrow.153 Connector Line.155 Connector Arrow.157 VSP VSP VSP Connector Arrow.159 UART 1 UART UART Connector double arrow.149 LIN 1 LIN LIN Connector double arrow.148 CAN 1 CAN CAN Connector double arrow.147 QSPI 1 QSPI QSPI Connector double arrow.146 Connector double arrow.151 DRAM DRAM DRAM Connector double arrow Connector Arrow TFT PMIC TFT PMIC TFT PMIC Connector Arrow.156 Backlight LED Driver Backlight LED Driver Backlight LED Driver Connector Line Sheet.169 SPI Flash SPI Flash SPI Flash Connector double arrow.152 Connector Arrow.156 Connector Arrow.171 TTL or LVDS 1024 x 1024 (Max) TTL or LVDS 1024 x 1024 (Max) TTL or LVDS1024 x 1024(Max) MCU MCU MCU MCU VCC VCC VCC UART 2 UART UART LIN 2 LIN LIN CAN 2 CAN CAN QSPI 2 QSPI QSPI I2C I2C I2C DBSC DBSC DBSC LVDS LVDS LVDS

MCU

RH850 Automotive MCUs

Primary Regulator

Buck Controllers (External FETs)

VSP

Display Processors

TFT PMIC

Integrated TFT-LCD DC-DC Regulators

Backlight LED Driver

Backlight LED Drivers