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5.3. 3.2V   Secondary   Voltage   Regulator  
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To ? provide ? power ? in ? excess ? of ? the ? Dialog ? PMIC’s ? capability, ? an ? external ? Voltage ? Regulator ? (Richtek, ?
RT8010) ? is ? used. ? The ? regulator ? is ? adjustable ? and ? is ? set ? to ? 3.2V ? so ? that, ? in ? the ? event ? the ? processor ? may ?
see ? two ? different ? sources ? for ? the ? required ? 3.3V ? power ? supply, ? the ? i.MX53 ? processor ? will ? preferentially ?
draw ? from ? VLDO3_3V3. ? The ? regulator ? is ? controlled ? (enabled) ? from ? the ? PWR_UP_GP_FB2 ? (J10) ? pin ? of ? the ?
Dialog ? PMIC. ? This ? is ? the ? only ? GPIO ? pin ? that ? can ? be ? programmed ? to ? turn ? on ? during ? the ? voltage ? timing ?
sequence ? of ? the ? Dialog ? PMIC ? and ? is ? timed ? to ? turn ? on ? at ? the ? same ? time ? VLDO3_3V3 ? comes ? on. ? The ?
internal ? pull ‐ up ? power ? source ? for ? this ? GPIO ? is ? programmed ? to ? be ? from ? VDD_IO1 ? (VLDO3_3V3) ? which ? is ?
the ? same ? voltage ? source ? for ? the ? Dialog ? RTC ? system. ? Since ? the ? i.MX53 ? standby ? power ? system ? is ? operated ?
at ? 1.3V, ? this ? prevented ? using ? the ? Dialog ? RTC ? system ? as ? an ? input ? to ? the ? i.MX53 ? processor. ? If ? the ? developer ?
does ? not ? want ? to ? enable ? the ? external ? voltage ? regulator ? from ? the ? Dialog ? GPIO ? pin, ? it ? would ? be ? possible ? to ?
reconfigure ? VDD_IO1 ? to ? be ? 1.3V ? and ? use ? the ? Dialog ? RTC ? clock ? instead. ? This ? is ? a ? design ? choice ? for ? the ?
developer. ?
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The ? external ? voltage ? regulator ? supplies ? power ? to ? the ? following ? general ? board ? areas ? and ? is ? expected ? to ?
supply ? up ? to ? the ? maximum ? specified ? currents ? as ? follows: ?
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i.MX53 ? USB ? Phy ? ? ?? 10 ? mA ?
VGA ? Connector ? Output ? ? ?? 10 ? mA ?
Audio ? ? ? ? ?? 10 ? mA ?
Debug ? UART ? ? ? ?? 60 ? mA ?
Ethernet ? ? ?
100 ? mA ?
Expansion ? Port ? (HDMI) ? ? ?? 30 ? mA ?
SD ? Card ? ? ? ?? 60 ? mA ?
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For ? the ? Expansion ? Port ? and ? the ? SD ? Card ? socket, ? it ? may ? be ? that ? the ? current ? draws ? exceed ? the ? above ?
estimates ? if ? a ? custom ? designed ? board ? is ? added ? to ? the ? Expansion ? Port, ? or ? if ? an ? SDIO ? device ? is ? plugged ? into ?
the ? SD ? Card ? Socket ? (ie, ? WiFi, ? Bluetooth). ? The ? external ? voltage ? regulator ? is ? capable ? of ? supplying ? up ? to ? 1A ?
of ? current ? and ? should ? be ? capable ? of ? accommodating ? most ? custom ? configurations. ?
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Since ? the ? Quick ? Start ? board ? was ? originally ? designed, ? it ? has ? been ? found ? that ? VDDA, ? VDDAL, ? and ? DIG_PLL ?
can ? all ? be ? powered ? internally ? by ? the ? i.MX53 ? processor ? (with ? the ? correct ? eFuse ? settings). ? This ? would ? then ?
free ? the ? PMIC ? VLDO2, ? VLDO6 ? and ? VLDO10 ? power ? sources ? for ? other ? uses. ? VLDO6 ? and ? VLDO10 ? will ? be ? able ?
to ? supply ? the ? above ? expected ? loads, ? provided ? a ? high ? current ? draw ? SDIO ? card ? is ? not ? inserted ? in ? the ? SD ?
Card ? Socket. ? The ? designer ? is ? free ? to ? rearrange ? power ? rails ? as ? desired. ?
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
38
PUBI – Public Use Business Information ?
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