How to read datasheet

i vi ngi k s in t ,th yu cu u tin l phi bit c thng s ca linh kin ca nh sn xut hay cn gi l datasheet . Vy datasheet l bng thng s thit k ca linh kin do nh sn xut thit k. Gii thch cch lm vic ca linh kin cng nh cch s dng n .Nhng do thng s ca mi linh kin l do nh sn xut ch to nn c c cng khng h n gin. Cha k phong cch vit ca mi k s mi ngi mi khc gy kh khn cho chng ta .Datasheet hay manual m c gi l kh c nht th c l danh hiu ny phi thuc v tp on in t Siemens c . Tuy nhin th Datasheet vn l ni tt nht cho chng ta c th tm kim mi thng tin .V vy chng ta phi bt buc c c datasheet nu bn l 1 k s .Yu cu u tin c c datasheet l cc bn phi bit ting anh !!!Nu bn no khng bit ting anh th ch t cng phi bit cch s dng cc cng c search m Bc Google l la chn s 1 . Nu bn khng c c 2 yu t ni trn th xin chc mng , bn nn dng c ti y.Ti liu ny khng c vit dnh cho cc bn .Datasheet cho ta bit c ton b thng s ca linh kin, v mi thng s li cho rt nhiu gi tr . u tin chng ta nn c trang 1 nm cc thng tin tng qut nht v IC nh ic loi g dng vo vic g in p lm vic bao nhiu, di o t bao nhiu n bao nhiu.- c phn n phn overview v c nhng phn quan tm nh to th vin th quan tm n kiu chn . Vic c kiu chn c quan tm nhiu nht khi cc bn phi ngi thit k mch in ( layout ) . Trang u tin thng cho bit tng quan v loi ,chc nng v nt c trng ca linh kin.Chng ta s nhanh chng nm c chng nng c bn ca n .ng dng c bn, thm ch 1 vi datasheet cn cho ta bit c s khi cu to bn trong ca n (i vi cc linh kin mch tch hp IC ) .

Tip n l miu t cc c trng vt l , quy cch ng gi, s cc chn output (pinout) , chc nng ca mi chn .

c tnh chi tit lm vic ca linh kin ,nh sn xut s cho bn nhng thng s tuyt i absolute maximum ratings , nhng thng s ny c ly t thc t v gn mc ngng ph hy ca linh kin ,khi thit k chng ta khng c tnh ton vt qu mc ngng ny .

1 s nh sn xut cn cho chng ta bng khuyn co cc thng s nn s dng (thng s c trng-typical) . Di in p hot ng , dng tiu th , mc logic , bng trng thi ,iu kin test th nghim .

Ngoi ra , ngi k s d hnh dung th datasheet cn cung cp cho ta nhng th , c tuyn lm vic ca linh kin :

i vi nhng IC logic th i km vi n lun c bng trng thi Truth tables, vi cc ch H(high) ,L(low),X ngha l mc logic khng xc nh , chnh v vy m khi thit k ta phi quan tm n cc iu kin m bo cho chip hiu c mc logic , vic mc logic mc 0 ,1 l do ngun cung cp quyt nh .Nu Vout > =2/3 Vcc th hiu l mc 1 ,v Vout < 1/3Vcc l mc thp, trong k thut s th ch c 2 mc, nhng thc ra n vn tn ti 1 khong m chip khng th hiu c l mc g , khng phi 0 ,khng phi 1 (Uncertain) .Thc ra , hiu r hn th cc bn c th nghin cu v mng logic m (Fuzzy) hoc tham kho quyn sch Fuzzy logic keyword ( Logic m ) .

i vi cc IC to xung , clock , Timing th n cn c thm gin xung :

V iu quan trng nht ca con linh kin m ngi k s quan tm nht l , con linh kin ng dng lm ci g ? s dng trong lnh vc g ? Th datasheet s cung cp cho chng ta nhng ng dng in hnh ca linh kin .Cc mu thit k ng dng tiu biu :

C thm cc mch mu :

Ngoi ra , i vi cc linh kin c nhng yu cu thit k layout ring , c bit th datasheet cn c phn hng dn cch thit k layout sao cho ph hp v ti u nht , vic thit k layout s nh hng rt ln n cht lng ca mch ,thit k pcb trnh b nhiu , suy gim tn hiu , EMI ,..V trang cui cng ca datasheet s lun l quy cch ng gi package .y l nhng thng s rt quan trng c dng thit k footprint cho linh kin .

Ngun tham kho : Sparkfun Electronic .