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8/13/2019 How to Interface the 24LC256 EEPROM to Arduino
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How to interface the 24LC256
EEPROM to Arduino.
The 24LC256 EEPROM:
The Microchip 24LC256 is a 32K x 8 (256 Kbit) Serial Electrically Erasable P!M" capable o#operatio$ across a broa% &olta'e ra$'e (*+ to 55+) ,t has bee$ %e&elope% #or a%&a$ce%" lo-.
po-er applicatio$s s/ch as perso$al co00/$icatio$s or %ata ac1/isitio$
This %e&ice also has a pa'e -rite capability o# /p to 64 bytes o# %ata This %e&ice is capable o#
both ra$%o0 a$% se1/e$tial rea%s /p to the 256K bo/$%ary /$ctio$al a%%ress li$es allo- /p toei'ht %e&ices o$ the sa0e b/s" #or /p to 2 Mbit a%%ress space This %e&ice is a&ailable i$ the
sta$%ar% 8.pi$ plastic ,P" S!,C" TSS!P" MS!P a$% paca'es
Feature:
• Si$'le S/pply -ith !peratio$ o-$ to 25+ #or 24LC256 e&ices
• Lo-.Po-er CM!S Tech$olo'y
• 7 cti&e c/rre$t 499 /" typical
• 7 Sta$%by c/rre$t 99 $" typical
• 2.:ire Serial ,$ter#ace" ,2C; Co0patible
• Casca%able /p to Ei'ht e&ices
• Sch0itt Tri''er ,$p/ts #or oise S/ppressio$
• !/tp/t Slope Co$trol to Eli0i$ate <ro/$% =o/$ce
• 99 >? a$% 499 >? Cloc Co0patibility
• Pa'e :rite Ti0e 5 0s 0ax
• Sel#.Ti0e% Erase@:rite Cycle
Pinout:
The 24LC256 EEP!M has the pi$o/t sho-$ i$ the #ollo-i$' pict/res
8/13/2019 How to Interface the 24LC256 EEPROM to Arduino
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Pi$s A!" A# and A2 select the ,2C a%%resses"
9 9 2 9 x
So i# yo/ co$$ect pi$s 9" " 2 to < the ,2C a%%ress -ill be 99999 A 9B59 i$
hexa%eci0al
The $P pi$ is -rite protectD" set this lo- #or rea%@-rite or hi'h #or rea% o$ly :e are 'oi$' toli$ it to <
Pi$ %cc -ill recei&e the 5+
Pi$ % is the <
&CL and &'A pi$s are the pi$s /se% by the ,2C b/s
(nterfacin) with Arduino
To i$ter#ace the 24LC256 chip to r%/i$o , %e&elope% a si0ple boar% /si$' a stripboar%
,t is sho-$ i$ the #ollo-i$' pict/re
8/13/2019 How to Interface the 24LC256 EEPROM to Arduino
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,# yo/ %eci%e to b/il% this boar%" re0eber that the copper tracs shall be o$ the botto0 si%e so
-he$ yo/ c/t the tracs yo/ ha&e to 0irror the abpo&e pict/re
o- yo/ ha&e to co$$ect" -ith so0e -ires" yo/r r%/i$o -ith this boar%
GND <--> GND
DA <--> A4
CL <--> A5
5V <--> 5V
Tetin) the *oard
o- letFs 0ae so0e test" the co%e to %o the test is &ery si0ple
#include <Wire.h> // for I2C
#define i2caddr !5 // de"ice addre for lef$-hand chi% on our
&read&oard
&'$e d() // da$a $o $ore in or read fro* $he ++,
"oid setup01
Serial.&e3in0521) // Ini$ialie $he erial line
Wire.&e3in01) // 6a7e u% $he I2C
Serial.%rin$ln08Wri$in3 da$a...81)
for 0in$ i() i<2) i991
6ri$eDa$a0i:i1)
;
Serial.%rin$ln08DN+81)
Serial.%rin$ln08eadin3 da$a...81)
for 0in$ i() i<2) i991
Serial.%rin$0i1) Serial.%rin$08 81)
8/13/2019 How to Interface the 24LC256 EEPROM to Arduino
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d(readDa$a0i1)
Serial.%rin$ln0d: D+C1)
;
Serial.%rin$ln08DN+81)
;
// 6ri$e a &'$e of da$a in *e*or' loca$ion addr
"oid 6ri$eDa$a0uni3ned in$ addr: &'$e da$a1
Wire.&e3in=ran*iion0i2caddr1)
// e$ $he %oin$er %oi$ion
Wire.6ri$e00in$10addr >> 11)
Wire.6ri$e00in$10addr ? !@@11)
Wire.6ri$e0da$a1)
Wire.end=ran*iion01)
dela'01)
;
// read a &'$e of da$a fro* *e*or' loca$ion addr&'$e readDa$a0uni3ned in$ addr1
&'$e reul$)
Wire.&e3in=ran*iion0i2caddr1)
// e$ $he %oin$er %oi$ion
Wire.6ri$e00in$10addr >> 11)
Wire.6ri$e00in$10addr ? !@@11)
Wire.end=ran*iion01)
Wire.reue$@ro*0i2caddr:1) // 3e$ $he &'$e of da$a
reul$ ( Wire.read01)
re$urn reul$)
;
"oid loop01
;
,# all is -ori$' #i$e the o/tp/t o$ the serial li$e sho/l% be as #ollo-s
:riti$' %ataG
!E
ea%i$' %ataG
2 2
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B B
DN+
