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?
?
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5.8.
VGA   Video   Output  
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?
The ? i.MX53 ? Applications ? Processor ? TV ? Encoder ? module ? provides ? three ? component ? video ? output ? signals ?
that ? can ? be ? used ? as ? either ? a ? TV ? signal ? or ? as ? a ? VGA ? signal ? to ? a ? connected ? monitor. ? The ? Quick ? Start ? board ?
configures ? these ? signals ? for ? use ? as ? a ? VGA ? output ? through ? connector ? J8. ? In ? addition ? to ? the ? 3 ? video ? signals, ?
Horizontal ? and ? Vertical ? Synchronization ? signals, ? I2C ? Data ? and ? Clock ? and ? a ? 5V ? reference ? signal ? are ?
connected ? to ? the ? VGA ? output ? in ? accordance ? with ? the ? VGA ? Video ? Standard. ? The ? video ? data ? signals ? are ?
referenced ? to ? 2.75V ? (TVDAC_2V75), ? while ? all ? other ? signals ? are ? referenced ? to ? 5V. ? The ? synchronization ?
signals ? leave ? the ? i.MX53 ? Processor ? referenced ? to ? 3.3V, ? but ? go ? through ? a ? pair ? of ? one ‐ way ? level ? shifters ?
(U12, ? U13) ? to ? meet ? the ? VGA ? standard ? required ? 5V ? reference. ? Similarly, ? the ? I2C ? Channel ? two ? signals ? leave ?
the ? processor ? referenced ? to ? 3.2V, ? but ? go ? through ? a ? bi ‐ directional ? level ? shifter ? (U14) ? to ? also ? become ?
referenced ? to ? 5V. ? See ? the ? connector ? section ? for ? the ? actual ? pin ‐ out ? of ? J8. ?
?
The ? Component ? Video ? signals ? are ? terminated ? to ? ground, ? each ? with ? a ? 75 ? Ohm ? resistor ? to ? meet ? cabling ?
requirements. ? A ? separate ? VGA ? ground ? plane ? has ? been ? created ? to ? minimize ? noise ? on ? the ? video ? signals ? by ?
necking ? through ? a ? small ? trace. ? The ? voltage ? reference ? signal ? for ? the ? TVDAC ? module ? is ? provided ? by ? placing ?
a ? 1.05K ? 1% ? Ohm ? resistor ? at ? pin ? Y18. ? The ? constant ? current ? source ? provided ? by ? the ? TVDAC ? module ?
generates ? the ? exact ? voltage ? reference ? required ? by ? the ? VGA ? standard. ? A ? 0.1uF ? capacitor ? should ? be ?
connected ? to ? pin ? AA19 ? to ? reduce ? noise ? on ? the ? voltage ? reference ? sense ? point. ? Each ? of ? the ? Component ?
Video ? output ? traces ? should ? be ? connected ? to ? their ? respective ? feedback ? pins. ? This ? provides ? the ? Cable ?
Detection ? (CD) ? circuitry ? the ? ability ? to ? detect ? whether ? a ? cable ? has ? been ? plugged ? into ? the ? connector. ? The ?
CD ? circuitry ? is ? not ? active ? for ? TV ? signal ? output, ? so ? it ? would ? not ? be ? necessary ? to ? connect ? the ? feedback ?
circuit ? in ? that ? case. ? If ? any ? signal ? filtering ? or ? conditioning ? components ? are ? added ? to ? the ? Component ? Video ?
traces, ? the ? feedback ? pins ? should ? be ? connected ? after ? the ? additional ? components ? (ie, ? feedback ? pins ? should ?
tap ? into ? to ? the ? connector ? side ? of ? the ? Component ? Video ? signals). ? A ? ferrite ? bead ? is ? recommended ? near ? the ?
voltage ? input ? pins ? of ? the ? TVDAC ? module ? to ? reduce ? noise ? in ? the ? video ? module. ?
?
?
? ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
54
PUBI – Public Use Business Information ?
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