Manuale d’uso / di manutenzione del prodotto PXA27X del fabbricante Intel
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Intel® PXA27x Process or Family Power Requirements Application Note Order Num ber: 2800 05 -002.
ii Applicati on Note INFORMA TION IN THIS DOCUMENT I S PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LIC ENSE, EXPRESS OR IM PLIED, BY ESTOPPEL O R OTHERWISE, TO ANY INTELL ECTUAL PROPERTY RIGH TS I S GRANTED BY THIS DOCUMENT .
Ap pl ica tio n No te iii Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Co nten ts Cont en ts 1.0 Introduct ion ..... ...... .......... .......... ....... ....... ...... ....... ....... ...... ....... ....... ...... .......... ..........
iv Application Note Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts Con tent s 7.2 nBATT _FAULT ...... ....... ...... ....... ....... ...... ....... ....... ...... ....... ....... ...... ....... .......... .......... ....... .. 32 8.0 Power Ma nagement Int egrated C ircuit Require ments .
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 5 1.0 Introduction The I ntel® PXA 27x Process or Family (PXA27x processo r) is a highly integrate d sys tem-on-chip opti m i zed f o r h a ndheld battery- powered devices such as PDAs and 2.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 6 Application Note The terms run m o de and no rm al m ode are us ed interchangeab ly , although nor mal mode comprises both the run -mode and tur bo-m ode settin gs.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 7 Figure 1. I n tel® PXA27x Proces sor Internal and External Pow er Domains SRAM 0 VCC_ R0 SRAM 1 VCC_ R1 SRAM 2 VCC_ R2 SRAM 3 VCC_ R3 RT C 32.768 k CPM 32.768 k PXT AL 13 M TXT A L 32.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 8 Application Note 2.1 Power Domain s and S ystem V o lt age/C urrent Requ ireme nt s The fo llowin g sectio ns doc ument th e p ower r equirem ents for the PXA2 7x pro cesso r, but do not includ e exter nal support, me m o ry , o r oth er peripheral comp onents.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 9 T a ble 2. Intel ® PXA2 7x Proc es sor V ol t ag e Doma ins (Shee t 1 of 2) V oltage Description VCC _BA TT BA TTERY VOL T A GE: V oltage-limited pow er from the main battery , or di rectly from a back up battery , at nominal 3.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 10 Application Note 2.1.2 Power Supply Configuration in a Minimal System For m inimal sy s t ems, only five (four if VCC_US IM is disab led ) reg ulator s are re quire d to pow er the PXA27x pro cessor an d its in p ut/outpu t interfaces , as shown in Ta b l e 3 .
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 11 More comp lex syste m s mi ght requ ire fur the r sepa ration o f supply do mains and addit iona l regu lators.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 12 Application Note Note : The f igur es in Ta b l e 4 whe re taken f rom a sys tem wit h no enhance d power manag ement optim ization suc h a.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 13 For each I/ O d o m ai n, max imum current draw and power use is highest at the 3.3 V su pply as sho wn. For lower vol tage s (2.5 V , or 1. 8 V) maximu m curr ent draw an d power use is re duced fo llo win g the P=CV 2 F rela tionsh ip.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 14 Application Note these sup plies must come up at the requi red voltage to oper ate reliably an d to avoid damage to the external com ponents. VCC_ IO must be the hi ghest potential o f the system I /O supplies 1 .
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 15 The system sche m at ic in Fi gur e 2 sho ws one rec ommende d config uratio n for c onnect ing the PXA27x process or directly t o the backup battery .
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 16 Application Note Figure 2. T ypica l Battery and External Regulator Co nfiguration PXA27x Processor.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 17 3.0 Int el® PXA27x Proces sor Low Pow er O per ating Mode s Th e P XA27x pro cess or provid es severa l low -powe r opera ting mod es th at tempo raril y suspen d or powe r d o wn th e core or per ipherals to reduce p ow e r consumption.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 18 Application Note 4.0 Power Controller Interface Signals The PX A27x proc esso r has an inter nal powe r mana ger uni t (PMU) a nd a set of I/O signal s for communicatin g with an external po wer man agement integrat ed circuit (PMI C).
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 19 4.1 Power Enable (P WR_EN) PWR_EN i s an acti ve-high outp ut from th e PXA27x proce ssor (inpu t to th e PMIC) that e nables t he exter nal core power s u pplies (VCC_C ORE, VCC_SRAM , and VCC_PLL) .
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 20 Application Note 4.4 P ower Manager I 2 C Dat a (PWR_SDA) / GPIO<4>) The PWR_S DA signa l is the power manager I 2 C data signal to the ex ternal PMIC. I t function s like an open-dr ain signal so either co m p onent can pull it dow n to a logic-low leve l.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 21 ass ertio n of nRESET for a mi nimum of 5 0 ms. This typ e of reset wo uld be used on ly for a s evere and other wise unrecoverabl e hardware or softw are problem, becau s e i t com pletely resets the s tate of th e process or and may result in lo st data.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 22 Application Note The PX A27x proc esso r has a low-powe r DC-to -DC c onvert er th at is enab led by so ftwar e wh ile in sleep or deep-s leep mode.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 23 5.1.2 Initial Power U p and Deep Sleep Exit S equence As sh own in Fig ure 2 , the ext ernal powe r manage ment inte grate d circuit (PMIC ) supplies both high -volt age (I/O) and low -volta ge (internal ) power to the PXA 27x pro cessor .
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 24 Application Note Note : The n RESET signal must be ass erted earlier in the reset seq uence for the processo r . Refer to the Intel® PXA2 7x Pr ocessor Family Elec trical, Mechani cal, and Therm al Specifi cation fo r pow er-on reset t iming sp ecifications.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 25 1 . The PMI C a ss ert s nRES ET . 2. The PXA27x processor a sserts the nRESET_OUT 1 sig nal.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 26 Application Note Note : 1 ) nRE SET _OU T asse rti on is soft war e progr am mab le du rin g proce sso r rese ts. Re fe r to the Inte l® PXA27x Pro cessor Family Developer’ s Manual . Figure 4.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 27 5.2 Slee p and D eep Slee p Th e sle ep and deep- sleep mode s reduce power co nsumpti on by pow ering do wn most un its in the PXA27x pro cessor. Howev er, the real-time clo ck, timekee ping oscillato r (32.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 28 Application Note Th e p rocess or comma nds ent ry into slee p m ode by de-ass ertin g PWR_EN to the PMIC once th e PMIC and system are prepar ed. The PMIC respon ds by turni ng off the specif ied set of supplies alon g w ith V CC_COR E, V CC_PL L, an d VCC _SRA M.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 29 Note : If the P MIC d oes not d isable VC C_CORE , VC C_PL L, or VCC_ SRA M whe n PW R_EN i s de - asser ted, the P.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 30 Application Note • I 2 C progr ammab le outpu t voltage ram p rate with a defau lt/res et ram p rate of 1 0mV/ µ s .
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 31 6.3 Power Ma nager I 2 C In ter fa ce The P XA27x proces sor commu nicates with the PM IC using the I 2 C ser ial bus.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 32 Application Note Sys tem design ers ca n incl ude a s oftware -contro lled thr eshol d level d etect ion fo r nV DD_F AUL T to allow an optio nal SDRAM k eep-alive cap ability .
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 33 8.2 Fea tures o f a PM IC The basic features o f a PM IC f or use w ith the PXA2 7x processo r includ e: • Multip.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 34 Application Note • USB on -the-g o char ge pump whi ch genera tes + 5.0 V (opti onal) The followin g analog/mixed-sig nal features are re.
Inte l® P XA27 x P rocesso r Fa mily Pow er Re quirem ents Ap pl ica tio n No te 35 8.3.3 DVM Control and S t atus Register 3 The Co ntrol a nd St atus registe rs con tain the G O bit which, once set.
Intel ® PXA2 7x Proc essor Fa mily Po wer Req uiremen ts 36 Application Note.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Intel PXA27X è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Intel PXA27X - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Intel PXA27X imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Intel PXA27X ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Intel PXA27X, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Intel PXA27X.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Intel PXA27X. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Intel PXA27X insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
