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DS1993L-F5+
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P17
DS19
92/
DS199
3
7
of
17
Fig
ure
6. ME
M
OR
Y FUNC
TION
S F
LO
W
CH
ART
M
a
s
t
er T
X M
em
or
y
Func
t
i
on C
om
m
an
d
Y
DS
19
9
x
se
ts Scrat
chpad
Of
fs
et =
(T
4:T
0)
and
Clears (PF
, OF,
A
A)
DS
19
9
x
s
ets (
E4:
E0)
= Sc
r
atc
hp
ad
O
f
f
s
et
DS
19
9
x
I
nc
r
em
ents
Scra
tchpa
d Offse
t
Bus
M
as
t
er
T
X
T
A1 (
T
7:T
0)
Bus
M
as
t
er
T
X
T
A2 (
T
15:T
8)
M
a
s
t
er T
X Dat
a B
yt
e
T
o Scr
atc
h
p
ad O
f
f
s
et
Bus
M
as
t
er
T
X R
es
e
t
?
N
0FH
W
rit
e
?
Scra
tchpa
d
N
Bus
M
as
t
er
TX
D
at
a
?
Y
N
PF =
1
N
Y
Bus
M
as
t
er
T
X R
es
e
t
?
T
o Fig
ur
e 6
S
ec
ond P
a
rt
Bus
M
as
t
er
R
X
T
A1 (
T
7:T
0)
Bus
M
as
t
er
R
X
T
A2 (
T
15:T
8)
M
a
s
t
er R
X
En
di
ng
Off
se
t wi
th Da
ta
Status (E/
S)
DS
19
9
x
S
ets
Scra
tchpa
d
Of
fs
et=(T
4:T
0)
Bus
M
as
t
er
T
X R
es
e
t
?
DS
19
9
x
I
nc
r
em
ents
Scra
tchpa
d Offse
t
Y
M
a
s
t
er R
X
D
at
a
B
yte Fr
om
Scra
tchpa
d Offse
t
N
N
Scra
tch
-
p
ad O
f
f
s
et =
11
11
1b ?
Y
Y
Scra
tchpa
d
AAH
Rea
d
?
Bus
M
as
t
er
RX "1
"s
Fr
om F
ig
ur
e 6
S
ec
ond P
a
rt
OF =
1
Scra
tch
-
p
ad O
f
f
s
et =
11
11
1b ?
N
P
ar
t
i
al
By
te W
ri
tte
n
?
N
Y
Y
Y
DS
19
9
x TX
Pr
e
s
enc
e Puls
e
(S
ee Fi
gu
r
e 9)
DS19
92/
DS199
3
8
of
17
Fig
ure
6. ME
M
OR
Y FUNC
TION
S F
LO
W
CH
ART
(c
o
nti
n
ue
d)
Y
N
Bus
M
as
t
er
T
X
T
A1 (
T
7:T
0)
Bus
M
as
t
er
T
X
T
A2 (
T
15:T
8)
Scra
tchpa
d
55H
C
op
y
?
N
Y
Fr
om F
ig
ur
e 6
First P
art
Bus
M
as
t
er
T
X
E/S Byt
e
DS
19
9
x
C
opi
es
Sc
r
a
tc
h
p
ad D
at
a
T
o Mem
or
y
Aut
h
or
i
z
at
i
on
C
od
e M
at
c
h
?
DS
19
9
x
TX "1"s
DS
19
9
x
TX "0"s
AA = 1
F0H
R
ead M
em
or
y
?
N
T
o Fig
ur
e 6
First P
art
Y
N
Bus
M
as
t
er
T
X R
es
e
t
?
Bus
M
as
t
er
T
X R
es
e
t
?
Y
N
Y
Y
Bus
M
as
t
er
T
X
T
A1 (
T
7:T
0)
Bus
M
as
t
er
T
X
T
A2 (
T
15:T
8)
DS
19
9
x
s
ets M
emor
y
Addr
es
s
= (T
1
5:T
0)
N
Y
N
M
a
s
t
er R
X
D
at
a
B
yte Fr
om
M
em
or
y Ad
dr
ess
Bus
M
as
t
er
T
X R
es
e
t
?
M
em
or
y
DS
19
9
x
Addr
es
s
C
ount
er
Inc
r
em
ent
s
Bus
M
as
t
er
RX "1
"s
Addr
es
s
=
21
Dh ?
DS19
92/
DS199
3
9
of
17
MEM
ORY F
U
NCTI
ON EX
AMPLES
Examp
le: Wr
i
t
e t
wo dat
a Bytes
t
o
me
mo
r
y
lo
c
at
io
ns 0
0
2
6
h a
nd 0
0
2
7
h (
t
he
s
e
ve
nt
h a
nd
e
ig
ht
h B
yt
es
o
f
page 1)
. Read ent
i
r
e
m
e
mor
y.
MAS
TER MODE
DATA (LSB FIRST)
COMM
EN
TS
TX
Reset
Rese
t
puls
e (480
µ
s to 960
µ
s)
RX
Presence
Presence p
u
l
s
e
TX
CCh
Issu
e sk
ip RO
M co
mma
nd
TX
0Fh
Issu
e wr
ite
scrat
chpad co
mmand
TX
26h
TA1, b
eginning o
ff
set = 6
TX
00h
TA2, address
= 0026h
TX
<2 dat
a By
t
es>
Wri
t
e 2 B
y
t
es of data to scrat
chpad
TX
Reset
Reset
pulse
RX
Presence
Presence p
u
l
s
e
TX
CCh
Issu
e sk
ip RO
M co
mma
nd
TX
Aa
h
Issue read scr
at
chpad co
mm
a
n
d
RX
26h
Read TA1, beg
inning o
ffset = 6
RX
00h
Read TA2, add
ress =
0026h
RX
07h
Read E/S
, ending o
ffset = 7, flags = 0
RX
<2 dat
a By
t
es>
Read scrat
chpad dat
a and verify
TX
Reset
Reset
pulse
RX
Presence
Presence p
u
l
s
e
TX
CCh
Issu
e sk
ip RO
M co
mma
nd
TX
55h
Issue co
py
scr
at
chpad co
mm
a
nd
TX
26h
T
A1
TA2 A
UT
HORIZATION CODE
E/S
TX
00h
TX
07h
TX
Reset
Reset
pulse
RX
Presence
Presence p
u
l
s
e
TX
CCh
Issu
e sk
ip RO
M co
mma
nd
TX
F0
h
Issue read
mem
o
r
y
co
mmand
TX
00h
TA1, b
eginning o
ff
set = 6
TX
00h
TA2, address
= 0000h
RX
<128 By
t
es (DS1992)>
<512 By
t
es (DS1993)>
Read ent
i
re
memor
y
TX
Reset
Reset
pulse
RX
Presence
Presence p
u
l
s
e,
do
ne
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P17
DS1993L-F5+
Mfr. #:
Buy DS1993L-F5+
Manufacturer:
Maxim Integrated
Description:
iButtons & Accessories 1Kb/4Kb Memory iButton
Lifecycle:
New from this manufacturer.
Delivery:
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TNT
EMS
Payment:
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Products related to this Datasheet
DS1993L-F5+
DS1992L-F5+
