User Manual for AV141 - Advanced Vision Technology
Contents
1. can be used to set the desired brightness 2 Power supply connector Supply range 6v to 14v nominal and recommended 12v At 12v in and running LED backlight at full brightness the unit should take about 1 3A 3 Potentiometer input Used to connect to a 3 pin pot The pot value should be 47K in order to achieve the full brightness range With a 47K pot current flow is about 25uA With the pot disconnected brightness is set controlled by internal PWM external PWM or set to a specific value With the pot connected the brightness set by the other methods is then also moderated by the pot position The pot will have the range from the intensity set by the other methods down to zero 4 amp J5 Screen LED backlight connector These connectors connect to the backlight LED chains The maximum voltage in open circuit on these connectors is 50v The AV141 should NOT be connected to a supply without BOTH of these connectors connected to the screen LED backlight 3 Pinout 1 Serial Comms and PWM AV141 Connector Part No JST B 6B PH K S Mating Part No JST PHR 6 Crimp Part No JST SPH 002T PO 55 2 Serial Power connector AV141 Connector Part No JST B 4B PH K S Mating Part No JST PHR 4 Crimp Part No JST SPH 002T PO 5S GND GND 3 Serial Power connector AV141 Connector Part No JST B 3B PH K S Mating Part No JST PHR 3 Crimp Part No JST SPH 002T PO 5S 4 amp J5 LED backlight connector2. AV141 Connector Part No Molex 52745 1096 Mating Cable No Molex 98266 0105 s s Ebene tp chain 4 EMC This module is designed to operate from within an enclosed host system which is build to provide EMC shielding Operation within the EU EMC guidelines is not guaranteed unless it is installed within an adequate host system This module is protected from damage by fast voltage transients originating from outside the host system which may be introduced through the output cables Short circuiting any output to ground does not cause the host PC system to lock up or reboot
3. Unit Module Description LED Back light controller User Manual for AV141 Advanced Vision Technology Ltd Thames House Mere Park Dedmere Road Marlow SL7 1PB This document is the property of AVT and may not be copied nor communicated to a third party without prior written permission Advanced Vision Technology Limited 2010 Revision History Issue Changes Made 1 0 Initial Draft 08 03 10 Table of Contents 1 is Ra 4 2 Functional DES CEI GOD iia ea 5 Zl Dierk Dias Teen Pe e 5 2 2 Mod le CS CPI Os ondo ER RENDIR UN DEAS 5 2 3 Interface Description 00 sssseeennnnnnznnnnnnnnnnnnnnnznnnnnnnnnnnnnnrarznnnnnnnnnnnnnnnzzzzznnznznnnnnnzzza 5 23 1 Mechanical tercio A ti at 5 2 992 Electrical TE a ee HERREN 6 3 l cai iaa 7 1 Introduction The AV141 is a highly versatile and efficient current controlled LED backlight inverter It is capable of driving and regulating backlight LED current of up to 50mA in 16 independent channels The LED chains can have a maximum forward voltage of 45v Backlight intensity can be controlled in a number of ways The method chosen for control is stored in non volatile memory along with the backlight intensity when the unit was last switched off LED intensity can be controlled using a POT an RS232 serial interface external PWM or LED intensity can be fixed 2 Functional Description 2 1 Block Diagram RS232 In Processor Boo
4. een backlight have referenced J4 and J5 Power is supplied to the AV141 with a 4 way PH type connector manufactured by JST There are two connections for Ov and two connections for 12v Only one set need be used The power connector is J2 m TS LONGAE al AV KU SEL Manual LAY Loe J The data interface connector is a six way PH type connector also by JST This allows serial data to be sent to the AV141 to control the mode and brightness There is also a connection on this connector to drive the AV141 with an external PWM source if required The serial connector is Jl A potentiometer can be connected to the AV141 to allow simple control of the brightness The pot should be of linear type and have a value of 47K ohms The pot connector is J3 2 3 2 Electrical Interface II Serial communications The AV141 can be controlled and is set up using a serial interface This can be connected directly to the serial port of a PC The PC serial port must be set as the following Baud rate 9600 8 data 1 stop no parity no flow control The commands are send in the format of a capital letter then a value The letter M indicates a Mode command and the letter B indicates a brightness value command There are 3 modes as follows M1 internal PWM mode M2 External PWM mode M3 Full on Internal PWM brightness is set at follows BO off B255 brightness B511 brightness B1023 Full brightness Any value from 0 to 1023
5. st Converter Backlight LEDs S Aw 416 Chains fx qx 16 channel Current Controller 4 x16 lt 4 Channels POT In 2 2 Module Description The AV141 is a highly versatile supply driver for LED backlights The unit employs a high efficiency boost converter to generate a voltage limited high side supply which is controlled to allow the required current to flow in the LEDs Maximum output voltage is limited to guard against open circuit conditions The maximum output voltage can be set up to 60v With a stable high side supply set the current controller then regulates the currents independently in the 16 LED chains at a preset value up to 50mA LED intensity is them controlled by low frequency PWM of the current control Both maximum high side voltage and maximum output chain current are set in hardware and must be specified when ordering Supply voltage is nominally 12v but can range from 6v speak to supplier before running from less that 12v to 14v 2 3 Interface Description 2 3 1 Mechanical Interface The Av141 has two FFC type ribbon cable connectors designed to interface with the AUO panel model M240HWO01 although other backlights may be driven Each FFC connector has two power connections for the high side voltage and 8 current regulated sink pins The FFC connectors on the AV141 are TOP contact such that the FFC cable needs only one fold The FFC connectors to connect to the scr
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