as3911 ? hf-rfid r eader ic - emv c omplianc e - a n t enna a ut o t uning - c apacitiv e w akeup ? sleep cur r en t of 5a - 1w output po w er - vhbr t o 6.8mbit/s nfc f or p oin t o f s a l e www .ams .c om/as3911 w e pr o vide inno v a tiv e analo g solutions t o the most challenging applic a tions in sensor and sensor in t er fac es , p o w er managemen t , and wir eless .
sales- eur op e@ams .c om sales-asia@ams .c om sales-americ as@ams .c om w w w .ams .c om pr oduc ts@ams .c om ? 06/2012 b y ams subjec t t o change without notic e h eadquar t ers ams a g t ob elbader s tr asse 30, 8141 un t erpr emstaett en, a ustria phone +43 3136 500-0 f ax +43 3136 525-01 g ener al description t he as3911 is a h igh ly i n t e gra t ed nfc initia t or / h f r ead e r i c. i t i n c ludes th e anal o g f r o n t en d ( a f e ) a n d a high l y i n t e gra t ed da t a f r a ming s y s t e m f o r i s o 18092 ( nfci p -1) i nit i a t o r , iso 18092 (nfcip -1) ac tiv e tar get , iso 14443 a and b r e a der ( i n c l u ding high bit r a t es) a nd f eli ca? r e a der . im p l emen t a tion o f o ther s tan d a r d a n d c ust o m pr o t o c ols is p o s sib l e thr o u gh usin g th e afe a nd im plemen ting fr a ming in t he e x t e r nal m icr o c o n t r o l - l er ( t r a n spar e n t mo de) . c o m p a r e d w i t h c o n cur r e n t n f c devic e s d e sig ned f or th e mobile p h o n e in mi n d , t he a s3911 is positi one d per f e c t ly f or the in f r a s truc t u r e s i d e o f th e nfc p o w e r . w i th ams ? u n i q u e a a t t ech n o l o g y , it is opt i m i z e d f or appl i c a t ion s w i t h d i r e c t l y d r i v en an t e n n a s . t he a s3911 is a lone in th e dom ain o f hf r e a der i cs in t h a t it c o n t ain s - tur e s , wh i c h make it inc ompa r able f or lo w po w er appl i c a t i o n s . i t c o n t a ins a lo w p o w e r c a p a citi v e sens o r , w hich c a n be us ed t o det e c t a pr e s e n c e of a c a r d wit h out s wit c h i n g meas u r e m e n t of am plit ude or pha se of sig n al on an t enn a l c tank and c o m par i ng it t o s t o r ed r e f e r enc e . i t als o c o n t ain s a l o w p o w er r c o scilla t or and w a k e -up t i m e r w h i c h usi ng one or mor e t e c hniqu es of lo w po w er det e c t ion of c a r d p r e s enc e (ca p a c i t i v e , ph a - m a kes i t ideal f or c a r a cce s s , ig nit i o n a nd dia g n o s tic fu n c tion s . t he a s3911 is d e s i g ned f or oper a tio n fr o m wide po w er su pply r a nge fr o m 2.4v t o 5.5v , per i pher a l i n t e r f a c e io p ins suppor t po w er su pply r a nge fr om 1.65v t o 5.5v . a pplic a tions f ea tur es - aa t sy st em pr o viding tuning of an t enna l c tank - i n t egra t ed capacitiv e sensing sy st em f or lo w po w er det ec tion of tag pr esenc e - iso 18092 (nfcip -1) initia t or - iso 18092 (nfcip -1) tar get (only ac tiv e mode) - iso 14443 a and b r eader - f elica? r eader - w ide supply v oltage r ange fr om 2.4v t o 5.5v (3.3v and 5v modes) - suppor t of vhbr (3.4 mbit/s pic c t o pcd fr aming , 6.8 mbit/s afe and pcd t o pic c fr aming) - i n t egra t ed sy st em of lo w po w er det ec tion of tag pr esenc e using phase or amplitude measur emen t - lo w po w er det ec tion of tag pr esenc e - close loop adjustmen t of ask modula tion f or ac cur a t e c on tr ol of modula tion depth - l o w po w er oper a ting mode r educ es r ec eiv er c onsumption fr om 10ma t o 4ma - - i n t egra t ed r egula t ors t o boost sy st em psrr - a m and p m (i/q ) demodula t or channels with aut oma tic selec tion - rssi measur emen t - a c cur a t e rf amplitude and phase measur emen t (8-bit a/d ) - h igh output po w er : ? up t o 1w in case of output ? up t o 200mw in case of single ended output and an t enna tr imming is used - s quelch f ea tur e which per f or ms gain r educ tion t o c ompensa t e f or noise gener a t ed b y tr ansponder pr oc essing - u ser selec table and aut oma tic gain c on tr ol - t r anspar en t and s tr eam modes t o implemen t other standar d and cust om pr ot oc ols - q uar tz oscilla t or capable of oper a ting with 13.56mh z or 27.12mh z cr y stal with fast star t -up - s tr ong diag nostic f ea tur es using the on-boar d 8-bit a/d c on v er t er - s er ial per ipher al in t er fac e (spi) with 96 b yt e fifo - lar ge per ipher al c ommunica tion supply r ange fr om 1.65v t o 5.5v - w ide t emper a tur e r ange: -40oc t o 85oc - 32-pin qfn (5x5mm) pack age - emv p a ymen t - a c c ess c on tr ol - a ut omotiv e - nfc i nfr astruc tur e - t icketing as3911 blo ck d iagr am re c eiv e r p ha s e & a m p l itu d e d e tect or tr a ns m i t t e r r e gul at o r s a / d c onver t e r log i c o s c i lla t o r b i a s e x t e r n a l fi e l d det e c t or x t o x t i r fo 1 r fo 2 r f i 1 r f i 2 s p i f i fo c on t r o l l ogi c s p i int erf a c e fr a m i ng v d d w a k e - u p t i m e r ca paci tiv e s e n s o r c s i c s o r c o s c i l l a t or le ve l s hifter s v dd _ i o as391 1
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