Ampro Corporation 486E Selecting Vee Polarity, LCD Bias Supply Option, J4 Pin J3 Pin Description

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Product Reference

LCD Bias Supply Option

The LCD Bias supply option is a small circuit board that supplies Vee power to an LCD display. The board converts the +5V from the Little Board/486e CPU to the Vee voltage (between 15V – 35V) required by many LCD panels. This voltage is available on flat panel connector J3.

LCD displays are sensitive to the sequence order and timing that power supply and control signals are applied to the display during power up and removed during power down cycles. LCD manufactures warn OEMs that violating the sequence and timing specifications of these signals can damage the display or reduce its service life. The LCD Bias supply option, in conjunction with control signals from the Little Board/486e video controller automatically sequences the appropriate signals to meet the requirements of virtually any LCD display

The Ampro LCD Bias Supply option mounts parallel to the Little Board/486e CPU connected to the board via a 12-pin connector, J4. Secure the board to the Little Board/486e CPU using a .6 inch standoff. Table 2–32 shows the connector pinout for J4, with a description of each signal. Some signals also appear on flat panel connector J3.

Table 2–32. LCD Bias Supply Option Connector (J4)

J4 Pin	J3 Pin	Description

1		Ground

2		+5V to the Vee Supply Option Board

4		Ground

6	38	Enable Vee
		TTL control signal driver by the VGA controller chip

8		Ground

11	46	Vee output, to panel

12	47	Contrast adjustment
		Analog control signal

Selecting Vee Polarity

Most LCD displays require a Vee supply of between 15v – 35V. Some panels need a negative supply, and some a positive supply. The LCD Bias Supply Option provides a jumper for selecting the Vee output polarity. To select the polarity for the panel being used, set the jumper on W1 on the LCD Bias Supply board, not on the Little Board/486e CPU, as shown in Figure 2–-9.

W1

Selects Negative Vee

Selects Positive Vee

Figure 2–9. Vee Polarity Selection Jumper

2–39

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Contents Little Board/486e Computer Revision Reason for Change Date Table of Contents Page Technical Specifications Index Technical Support IntroductionThis page left intentionally blank Viii CPU/Motherboard FeaturesChapter General DescriptionVL-Bus Flat Panel/CRT Display Controller Enhanced Embedded-PC BiosIDE Interface Serial PortsEnhanced Parallel Port Floppy InterfaceByte-Wide Socket and Solid State Disk SSD Ethernet LAN InterfaceModular PC/104 Expansion Bus Enhanced ReliabilityHalt Testing Software Little Board Development Platform Overview Interface Connector SummaryConnectors Connector Function Size Key PinConnector and Jumper Locations Jumper Group Function Default Jumper Configuration OptionsSystem I/O Map Address Function Connector Type Mating Connector DC PowerPin Connection Backup Battery Power RequirementsCooling Requirements Powerfail Monitor System Memory Map DramMemory Address Function Expanded Memory and Extended MemoryAddresses Serial Ports J11, J13RS-232C Serial Ports RS-485 Serial PortIRQ11 IRQ7 Interrupt AssignmentsSerial Port Connectors J11, J13 ROM-BIOS Installation of the Serial PortsName Pin Ports Pin Signal Function In/Out DB25Pin Signal Name Configuring Serial 2 for RS-485 J6, W5, W6Pin RJ11 Signal Standard Wire Color RS-485 Twisted-Pair Cabling Using RJ11 ConnectorsInterconnection Scheme Examples Using the RS-485 InterfaceSerial Console Hex CommandSerial Handshake COM Port TableUsing a Serial Modem Serial Booting and Serial ProgrammingRegister Name Address Primary Secondary Bi-Directional Parallel PortSelection Address Interrupts Signal Type Number of Lines Function Output Drive ROM-BIOS Installation of Parallel PortsStandard and General Purpose I/O Operation Parallel Port Interrupt Register Bit Signal Name In/Out Active J15 Parallel Port Interrupt EnableOr Function High/Low Pin J15 Pin Signal Function In/Out DB25 Name Parallel Port Connector J15Register Bit Definitions Signal Name Full Name DescriptionFloppy Drive Considerations Floppy Disk InterfaceCapacity Drive Size Tracks Data Rate Floppy Interface Connector J14 Floppy Interface ConfigurationPin Signal Name Function In/Out IDE Hard Disk Interface IDE Connector J1225. IDE Drive Interface Connector J12 IDE Interface Configuration Solid-State Disk Preparation Master/Slave SettingCompact Flash Solid-State Disk Enabling the DriveName Connector Pins/Type Description Connecting a CRT J5Flat Panel/CRT Video Controller Part Description Mating Connector J5 Pin Signal Name DB-15 DB-9W10 +5V Connecting a Flat Panel J3FLM Pin Signal Description NameAdvanced Power Management Power SequencingPgmebios VIDEO=filename Bios Support of Non-Standard PanelsLCD Bias Supply Option Selecting Vee PolarityJ4 Pin J3 Pin Description Ra = 270 Rb = Vee max Vee min / 1.5 Attaching an External Contrast ControlExample Network Terms Ethernet Network InterfaceQNX Installing an Ethernet Boot PromTwisted Pair Interface J7 Twisted-Pair InstallationsInstalling a Boot Prom Installing a Boot Prom in Byte-Wide Socket S0Using Network Operating Systems NOS Controlling the Ethernet LAN Interface Directly Network OS DriversProgram Name Vendor Function Driver Name 00 40 Manufacturer’s Ethernet IDByte-Wide Socket S0 SSD Device Size Package Generic Type Pins Part NumberAddressing the Byte-wide Socket ROM-BIOS ExtensionsWindow Address Performance Issues Accessing the Byte-Wide SocketSolid State Disk SSD Drives Device 64KB Segment Address Size Segments Upper Nibble of BH Jumpering the Byte-Wide Socket Byte-Wide Socket SignalsTypical Devices Pins Jumper Diagram W14 Pin Signal Name DescriptionFlash Eprom Typical Devices Pins Jumper Diagram Using EPROMsFlash Eprom Programming Non-volatile RAM Using SRAMsUtility Connector J16 Exsmi Pin Signal Name FunctionLED Connection Push Button Reset ConnectionExternal Battery Connections PC SpeakerBattery-Backed Clock Jumper W4 Watchdog TimerWDT Response AL,61H AL,NOT 08H OUT 61H,AL Page AT Expansion Bus Onboard MiniModule Expansion Using Standard PC and AT Bus CardsBus Termination Bus Expansion GuidelinesExpansion Bus Connector Pinouts PU/PD/S Pin Signal Function In/Out Current47. AT Expansion Bus Connector, B1-B32 P1 48. AT Expansion Bus Connector, C0-C19 P2 PU/PD/S Interrupt Function Interrupt and DMA Channel UsageSerial Parallel Floppy Channel FunctionEthernet Video Setup Overview Menu Name Functions Standard CMOS/EEPROM Setup Setup Page 1-Standard CMOS/EEPROM SetupIDE Hard Disk Drives Drive Parameter SetupDate and Time Floppy DrivesPage System Post Error HaltVideo Dram MemoryExtended Bios Setup Page 2-Options/Peripheral ConfigurationSelection Address Interrupt Serial PortParallel Port Port AddressSelection Address Floppy Interface EnableIDE Interface Enable Hot Key Setup EnableBlank Post Test Video StateLocal Bus Video Display Byte-Wide Socket ConfigurationSerial Boot Loader Enable Watchdog Timer ConfigurationFlat Panel Display Type Installing a Modified Bios to Support a New PanelExtended Serial Console Configuration Setup Page 3-Serial Console ConfigurationPage Switch Function Creating Configuration Files with SETUP.COMDIR LPT1 Operation with DOSUtility Software Overview Embedded-PC System Enhancements Little Board/486e CPU SpecificationsOnboard Peripherals CRT Support for Standard Video Modes Vesa Font Pixels Clock Horiz Vert Mem Mode MHz KHz Support Software Mechanical and Environmental Specifications Mechanical Dimensions Technical Specifications Page Index Page POST, Setup Little Board/486e Technical Manual Index-4