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When ? designing ? a ? circuit ? to ? use ? the ? Backlight ? LED ? driver, ? it ? is ? important ? to ? connect ? the ? cathode ?
(negative) ? end ? of ? the ? LED ? string ? directly ? to ? the ? LED_IN ? port ? of ? the ? PMIC. ? The ? PMIC ? controls ? the ? supply ?
voltage ? to ? the ? Backlight ? LEDs ? by ? ensuring ? that ? the ? voltage ? sensed ? on ? the ? LED_IN ? port ? is ? above ? a ?
threshold ? voltage ? of ? 0.7V. ? If ? more ? than ? one ? LED_IN ? ports ? are ? used, ? the ? lowest ? port ? must ? be ? above ? the ?
threshold ? value. ? If ? the ? designer ? connects ? the ? cathode ? end ? of ? the ? Backlight ? LED ? string ? to ? GROUND, ? the ?
boost ? circuit ? will ? not ? work. ?
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The ? MOSFET ? used ? in ? the ? boost ? circuit ? should ? have ? a ? low ? ON ? Resistance ? value ? for ? best ? efficiency. ? The ?
MOSTFET ? chosen ? for ? the ? Quick ? Start ? board, ? ON ? Semiconductor ? NTLJF4156NT1G, ? also ? contains ? a ?
necessary ? diode ? used ? in ? the ? boost ? circuitry. ? This ? helps ? reduce ? the ? number ? of ? components. ?
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5.2.4.
Touch ‐ Screen   Operation  
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The ? Dialog ? PMIC ? contains ? an ? autonomous ? Touch ? Screen ? Interface ? which ? will ? measure ? the ? XY ? positions ?
from ? a ? standard ? 4 ‐ WIRE ? resistive ? touch ? panel. ? The ? single ? ADC ? channel ? will ? detect ? the ? presence ? of ? a ? pen ?
touch ? on ? the ? panel, ? and ? that ? will ? trigger ? a ? series ? of ? voltage ? measurements ? on ? each ? of ? the ? four ? touch ?
panel ? wires ? (X+, ? X ‐ , ? Y+, ? Y ‐ ) ? by ? the ? ADC ? in ? a ? pre ‐ selected ? sequence. ? The ? resulting ? voltage ? readings ? are ?
then ? reported ? to ? the ? i.MX53 ? Applications ? Processor ? for ? conversion ? to ? a ? panel ? X ‐ Y ? position ? via ? the ? I2C ?
communications ? link. ?
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To ? ensure ? the ? Touch ? Screen ? Interface ? wakes ? up ? autonomously ? with ? a ? pen ? stroke, ? it ? is ? necessary ? to ?
supply ? a ? 1.8V ? reference ? voltage ? to ? the ? TSIREF_GPIO_7 ? pin ? of ? the ? PMIC. ? It ? is ? recommended ? that ? one ? of ?
the ? high ? PSSR ? Regulators ? of ? the ? PMIC ? be ? used ? to ? supply ? this ? voltage. ? VLDO6 ? – ? VLDO9 ? are ? possible ?
sources ? for ? supplying ? this ? reference ? voltage. ?
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5.2.5.
Miscellaneous  
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If ? a ? coin ? cell ? battery ? is ? attached ? to ? the ? Quick ? Start ? board, ? it ? will ? automatically ? charge ? using ? the ?
programmed ? charging ? settings ? whenever ? wall ? power ? is ? supplied ? to ? the ? Quick ? Start ? board. ? When ? the ?
battery ? voltage ? reaches ? the ? programmed ? level, ? charging ? will ? stop. ? Battery ? discharge ? will ? not ? begin ? until ?
wall ? power ? is ? removed ? from ? the ? board ? and, ? if ? a ? Li ‐ ION ? battery ? is ? attached, ? the ? main ? battery ? discharges ?
to ? the ? battery ? cut ? off ? level. ?
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There ? are ? two ? port ? ID ? traces ? connected ? from ? the ? Expansion ? Port ? header ? to ? two ? of ? the ? ADC ? pins ? of ? the ?
PMIC. ? Each ? unique ? Daughter ? Card ? designed ? by ? Freescale ? has ? a ? different ? resistor ? value ? attached ? to ? the ?
two ? ID ? traces ? on ? the ? Daughter ? Card. ? It ? is ? possible ? to ? use ? this ? voltage ? divider ? identification ? system ? to ?
determine ? at ? boot ? time ? if ? a ? daughter ? card ? is ? attached, ? and ? if ? so, ? which ? specific ? daughter ? card ? it ? is. ?
Resistor ? values ? for ? the ? two ? daughter ? cards ? commonly ? used ? with ? the ? Quick ? start ? board ? are ? shown ? in ?
Table ? 3 . ?
? ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
36
PUBI – Public Use Business Information ?
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