Microchip Technology MCP3421DM-WS 데이터 시트
MCP3421
DS22003E-page 20
© 2009 Microchip Technology Inc.
FIGURE 5-3:
iming Diagram For Reading From The MCP3421 With 18-Bit Mode.
9
1
9
1
9
1
9
1
9
1
9
1
11
0
1
A
2
A1
A0
D
RDY
O
/C
AC
K
b
y
MCP34
2
1
R/
W
St
a
rt
B
it
b
y
Mast
er
Re
peat
of D17 (MSB
)
2n
d B
y
te
Upper
Dat
a
Byte
(Dat
a on Clocks
1-
6th
can be igno
red)
ACK by
Mast
er
AC
K
b
y
Mast
er
AC
K by
Maste
r
T
o
con
tin
ue:
A
C
K
b
y
Mast
er
17
D
16
D
15
D
14
D
13
D
12
D
11
D
10
D
9
D
8
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
C
1
C
0
S
1
S
0
G
1
G
0
1
s
t B
y
te
MCP34
21 Addr
ess Byt
e
3rd Byt
e
Mi
ddle Dat
a
B
y
te
4t
h Byte
Lo
w
e
r Da
ta
Byte
5t
h Byte
Con
fig
uration
B
y
te
(Op
tio
nal)
C
1
C
0
S
1
S
0
G
1
G
0
NAK
by
Master
St
o
p
B
it
b
y
Mast
er
(Op
tio
nal)
Nt
h Repea
te
d
B
y
te
:
Con
fig
uration
Byte
Note:
– MCP3
421
de
vice code is
1101
.
– Se
e
for
det
a
ils in Address
Byte.
– S
top bi
t or NAK
b
it
can
b
e
issued an
y
time duri
ng readi
ng.
– Dat
a
b
it
s
on
clo
cks 1 - 6th
i
n
2nd byte are repe
ated MSB an
d ca
n be ign
o
red.
– Configu
ration byte repea
ts
as lon
g
a
s
clo
ck
is provi
ded af
ter
the
5
th byte.
SC
L
SD
A
RDY
O
/C
T
o
e
nd:
NAK
b
y
Mast
er