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Hardware Reference Manual for i.MX53 Quick Start
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RESET: ? ?
Pressing ? the ? RESET ? button ? in ? the ? ‘Power ? On’ ? state ? will ? force ? the ? i.MX53 ? Applications ??
Processor ? to ? immediately ? turn ? off, ? and ? reinitiate ? a ? boot ? cycle ? from ? the ? Processor ? Power ?
Off ? state. ? The ? RESET ? button ? has ? no ? effect ? on ? the ? PMIC ? or ? the ? voltage ? rails. ?
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Pressing ? the ? RESET ? button ? when ? the ? Quick ? Start ? board ? is ? powered ? off ? will ? have ? no ?
effect. ?
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USERDEF1: ?
USERDEF2: ?
These ? two ? buttons ? are ? user ? defined ? buttons ? attached ? to ? PATA_DATA14 ? (P6) ? for ??
USERDEF1 ? and ? PATA_DATA15 ? (P5) ? for ? USERDEF2. ? The ? two ? GPIO ? pins ? are ? normally ? pulled ??
high ? by ? an ? internal ? resistor. ? The ? two ? buttons ? function ? by ? connecting ? the ? pins ? to ? ground, ?
thus ? inserting ? a ? low ? signal. ? The ? developer ? is ? left ? to ? determine ? the ? actions ? of ? these ? two ?
pins ? in ? code. ? Sample ? codes ? do ? not ? assign ? functionality ? to ? either ? pin. ?
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3.18. User   Interface   LED   Indicators  
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There ? are ? eight ? LED ? status ? indicators ? located ? next ? to ? the ? microSD ? card ? connector. ? These ? LEDs ? have ? the ?
following ? functions: ?
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5V: ? ?
The ? 5V ? status ? LED ? (D1) ? is ? a ? Green ? LED ? connected ? directly ? to ? the ? 5V_MAIN ? power ? rail. ??
This ? LED ? indicates ? that ? 5V ? wall ? power ? is ? being ? properly ? supplied ? to ? the ? Quick ? Start ?
board. ? If ? this ? light ? is ? not ? lit, ? it ? would ? indicate ? one ? of ? three ? problems: ?
1) Fuse ? F1 ? has ? been ? blown ? and ? needs ? to ? be ? replaced. ?
2) Voltage ? from ? the ? wall ? supply ? is ? greater ? than ? 5.5V ? and ? the ? over ? voltage ?
protection ? feature ? is ? disabling ? power ? to ? the ? board. ?
3) The ? DC ? Power ? supply ? is ? not ? plugged ? in ? or ? malfunctioning. ?
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PMIC: ? ?
USER: ? ?
The ? PMIC ? status ? LED ? (D9) ? is ? a ? Green ? LED ? gated ? by ? the ? PMIC ? SYS_UP ? signal ? from ? the ??
PMIC. ? This ? LED ? indicates ? that ? the ? PMIC ? is ? in ? the ? fully ? on ? condition ? and ? supplying ? power ?
to ? the ? processor ? and ? other ? voltage ? rails ? as ? directed ? by ? software. ?
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The ? User ? status ? LED ? (D16) ? is ? a ? Green ? LED ? gated ? by ? the ? PATA_DATA1 ? (L3) ? GPIO ? pin. ? The ?
developer ? is ? left ? to ? determine ? the ? action ? of ? this ? pin ? in ? code. ? Sample ? codes ? do ? not ? assign ?
functionality ? to ? the ? pin. ? The ? LED ? comes ? on ? by ? default ? when ? the ? processor ? starts ? up. ?
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FLT: ? ?
3.3V: ? ?
The ? FLT ? status ? LED ? (D14) ? is ? a ? Red ? LED ? gated ? by ? the ? NVDD_FAULT ? signal ? from ? the ? PMIC. ??
The ? LED ? will ? turn ? on ? anytime ? the ? PMIC ? is ? not ? outputting ? the ? requested ? voltages ? or ? when ?
the ? PMIC ? senses ? a ? fault ? condition ? and ? will ? begin ? to ? power ? down ? the ? voltage ? rails. ? This ?
may ? aid ? in ? trouble ? shooting ? power ? problems ? if ? both ? the ? PMIC ? and ? FLT ? LEDs ? are ? on ? at ? the ?
same ? time, ? it ? indicates ? that ? the ? PMIC ? is ? causing ? a ? shutdown ? based ? on ? a ? fault ? it ? has ?
sensed. ?
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The ? 3.3V ? status ? LED ? (D10) ? is ? a ? Blue ? LED ? gated ? by ? the ? External ? Regulator ? 3.2V ? power ? rail. ??
This ? power ? rail ? can ? be ? turned ? off ? by ? software ? for ? power ? savings ? measures. ? This ? LED ?
provides ? an ? easy ? visual ? recognition ? as ? to ? the ? status ? of ? this ? bus. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
13
PUBI – Public Use Business Information ?
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