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DP7172 Datasheet(PDF) 8 Page - Copal Electronics

Part # DP7172
Description  256-Position SPI
PDF  11 Pages
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Manufacturer  COPAL [Copal Electronics]
Direct Link  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

DP7172 Datasheet(HTML) 8 Page - Copal Electronics

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DP7172
8
Basic Operation
The DP7172 is a
r.
is
s
a
as
as CS
high.
is
e re
ed via he SPI
i
rf
.
The
edge
CS
as
d
S
are
r.
I
is
(12
If CS is
DP7172
(W =
This
is
has
CS
as
Programming: Variable Resistor
Rheostat Mode
The
A
RAB has a
k
k
has 256
B
.
W
e
256
The
r s
is
B
g
a
W
as
a
is a
e
is a
d
RON
FET
DP7172
. Thus a
a
r
k
1
(RWB = RAB/256 + RW =
6
1
.
Figure 1
a
is
1
B
Figure 14. DP7172 Equivalent DP Circuit
RS
Wiper
Register
and
Decoder
A
W
B
RS
RS
RS
The
R
WB
D
256
R
AB
R
W
(eq. 1)
e D is
d
W
r RAB is
a
RW is
sis
e
I
if RAB
k
he
i
resis
RWB
e s
r
W
Table 7. CODES AND CORRESPONDING RWB
RESISTANCE FOR RAB =100 k ,VDD =5V
D (Dec.)
RWB ( )
Output State
255
99,559
Full Scale (RAB –1LSB+RW)
128
50,050
Midscale
1
441
1 LSB
0
50
Zero Scale
(Wiper Contact Resistance)
Be
e
W
dB
a
d
s
f
r
r
f
DP
W
A
a
RWA.
are
B
e
RWA
.
The
is
R
WA(D)
256
D
256
R
AB
R
W
(eq. 2)



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