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Hardware Reference Manual for i.MX53 Quick Start
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5.4.4. i.MX53   Internal   Regulators  
 
The ? i.MX53 ? Applications ? Processor ? contains ? two ? internal ? voltage ? regulators ? which ? can ? supply ? VDDA, ?
VDDAL, ? VDD_DIG_PLL ? and ? VDD_ANA_PLL. ? The ? power ? input ? for ? this ? pin ? is ? VDD_REG ? (pin ? G18). ? On ? the ?
Quick ? Start ? board, ? this ? pin ? is ? connected ? to ? VBUCKPERI ? and ? is ? set ? to ? 2.5V. ??
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The ? Digital ? PLL ? voltage ? regulator ? can ? be ? selected ? to ? supply ? VDD_DIG_PLL ? through ? an ? internal ? (on ? die) ?
connection. ? The ? VDD_DIG_PLL ? pin ? can ? also ? be ? connected ? to ? the ? VDDA ? and ? VDDAL ? pins ? through ? an ?
external ? connection ? to ? allow ? the ? Digital ? PLL ? regulator ? to ? supply ? these ? rails ? as ? well. ? The ? Digital ? PLL ?
regulator ? is ? set ? to ? start ? at ? a ? reduced ? voltage ? value ? of ? 1.2V, ? but ? is ? programmed ? by ? software ? to ? increase ? to ?
1.3V ? early ? in ? the ? boot ? process. ? On ? the ? Quick ? Start ? board, ? the ? VDD_DIG_PLL ? connection ? to ? VLDO2 ? is ? not ?
populated ? by ? default, ? so ? that ? VDD_DIG_PLL ? power ? is ? supplied ? by ? the ? internal ? regulator. ? The ? VDDA ?
supply ? pins ? are ? connected ? to ? VLDO10 ? through ? a ? shorting ? trace ? SH22. ? If ? the ? developer ? wishes ? to ?
experiment ? with ? supplying ? VDDA ? from ? the ? internal ? regulator, ? the ? trace ? between ? the ? two ? pads ? of ? SH22 ?
can ? be ? cut, ? and ? a ? wire ? soldered ? between ? SH22 ? pin ? 2 ? and ? resistor ? R210 ? pin ? 2. ? The ? VDDAL ? supply ? pin ? is ?
connected ? to ? VLDO6 ? through ? a ? shorting ? trace ? SH24. ? If ? the ? developer ? wishes ? to ? experiment ? with ?
supplying ? VDDAL ? from ? the ? internal ? regulator, ? the ? trace ? between ? the ? two ? pads ? of ? SH24 ? can ? be ? cut, ? and ? a ?
wire ? soldered ? between ? SH24 ? pin ? 2 ? and ? resistor ? R210 ? pin ? 2. ?
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The ? Analog ? PLL ? voltage ? regulator ? can ? be ? selected ? to ? supply ? VDD_ANA_PLL ? through ? an ? internal ? (on ? die) ?
connection. ? The ? Analog ? PLL ? is ? set ? to ? supply ? a ? voltage ? of ? 1.8V. ? On ? the ? Quick ? Start ? board, ? the ?
VDD_ANA_PLL ? connection ? to ? VLDO8 ? is ? not ? populated ? by ? default, ? so ? that ? VDD_ANA_PLL ? is ? supply ? by ? the ?
internal ? regulator. ?
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Developer ? Note: ? During ? the ? boot ? process, ? it ? takes ? approximately ? 310msec ? for ? VDD_DIG_PLL ? to ? change ?
from ? 1.2V ? to ? 1.3V. ? During ? this ? time, ? the ? i.MX53 ? core ? will ? not ? run ? at ? full ? speed/maximum ? processor ?
loading. ? It ? will ? operate ? in ? the ? reduced ? power ? mode, ? and ? the ? limitations ? of ? the ? reduced ? power ? mode ?
discussed ? in ? the ? datasheet ? apply. ? It ? is ? expected ? that ? during ? the ? first ? 310msec, ? processor ? loading ? will ? not ?
be ? an ? issue. ?
5.4.5. Watch   Dog   Timer  
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The ? i.MX53 ? Application ? Processor ? has ? an ? internal ? Watch ? Dog ? Timer ? circuit. ? On ? the ? Quick ? Start ? board, ? the ?
WDOG ? output ? is ? assigned ? to ? GPIO_9. ? The ? WDOG ? is ? an ? active ? low ? signal. ? The ? Dialog ? PMIC ? does ? not ? have ?
a ? specific ? pin ? to ? accept ? a ? Watch ? Dog ? signal ? to ? force ? a ? Processor ? reset. ? Therefore, ? the ? WDOG ? signal ? is ?
modified ? by ? hardware ? components ? on ? the ? Quick ? Start ? board ? and ? applied ? to ? the ? Processor ? Reset ? pin ?
(POR_B, ? pin ? C19). ? By ? using ? an ? active ‐ low ? enabled ? buffer, ? the ? active ? low ? WDOG ? signal ? can ? be ?
transformed ? into ? a ? low ? pulse, ? which ? returns ? back ? to ? the ? logic ? high ? state ? immediately ? after ? the ? i.MX53 ?
Processor ? resets ? ( ? ~ ? 700 ? nsec). ? This ? allows ? the ? processor ? to ? reset ? the ? WDOG ? signal ? and ? then ? come ? out ? of ?
reset. ? The ? buffer ? IC ? also ? is ? in ? a ? tri ‐ state ? condition ? when ? the ? WDOG ? signal ? is ? normally ? high, ? thus ? allowing ?
the ? push ‐ button ? reset ? circuitry ? to ? work. ? The ? Watch ? Dog ? circuitry ? is ? shown ? in ? Figure ? 19 . ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
49
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