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CAT522WI-TE10 Datasheet(PDF) 7 Page - Catalyst Semiconductor

No. de pieza CAT522WI-TE10
Descripción Electrónicos  Configured Digitally Programmable Potentiometer
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT522WI-TE10 Datasheet(HTML) 7 Page - Catalyst Semiconductor

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CAT522
7
Doc. No. 2004, Rev. E
Figure 3. Temporary Change in Output
same as that which had been there previously no change
in the DPP’s output is noticed. Had the value held in the
control register been different from that stored in non-
volatile memory then a change would occur at the read
cycle’s conclusion.
TEMPORARILY CHANGE OUTPUT
The CAT522 allows temporary changes in DPP’s output
to be made without disturbing the settings retained in
non-volatile memory. This feature is particularly useful
when testing for a new output setting and allows for user
adjustment of preset or default values without losing the
original factory settings.
Figure 3 shows the control and data signals needed to
effect a temporary output change. DPP wiper settings
may be changed as many times as required and can be
made to any of the two DPPs in any order or sequence.
The temporary setting(s) remain in effect long as CS
remains high. When CS returns low all two DPPs will
return to the output values stored in non-volatile memory.
When it is desired to save a new setting acquired using
this feature, the new value must be reloaded into the
DPP wiper control register prior to programming. This is
because the CAT522’s internal control circuitry discards
from the programming register the new data two clock
cycles after receiving it if no PROG signal is received.
Amplified DPP Output
APPLICATION CIRCUITS
Bipolar DPP Output
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
D0
D1
D2
D3
D4
D5
D6
D7
1
NEW DPP DATA
CURRENT DPP DATA
DO
DI
CS
PROG
DPP
OUTPUT
t
1
2
3
4
5
6
7
8
9
10
11
12
N
N+1 N+2
o
CURRENT
DPP VALUE
NON-VOLATILE
NEW
DPP VALUE
VOLATILE
CURRENT
DPP VALUE
NON-VOLATILE
RDY/BSY
MSB
LSB
1111
1111
—— (.98 V
) + .01 V
= .990 V
V
= +4.90V
1000
0000
—— (.98 V
) + .01 V
= .502 V
V
= +0.02V
0111
1111
—— (.98 V
) + .01 V
= .498 V
V
= -0.02V
0000
0001
—— (.98 V
) + .01 V
= .014 V
V
= -4.86V
0000
0000
—— (.98 V
) + .01 V
= .010 V
V
= -4.90V
REF
REF
REF
IF
V
= 5V
REF
255
255
OUT
DPP INPUT
DPP OUTPUT
ANALOG
R = R
OUTPUT
REF
REF
REF
OUT
128
255
127
255
REF
REF
REF
OUT
1
255
REF
REF
REF
OUT
REF
REF
REF
OUT
0
255
V
= 0.99 V
FS
REF
V
= 0.01 V
ZERO
REF
V
= ——— (V
- V
) + V
DPP
CODE
255
FS
ZERO
ZERO
CAT522
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
OP 07
VOUT
-15V
+15V
+5V
RR
I
F
V
= (1 + –––) V
OUT
DPP
RF
RI
CAT522
GND
VDD
VREFH
VREFL
CONTROL
& DATA
+
OP 07
V
=
(
) -V
OUT
RF
R +
i
-15V
+15V
+5V
RR
i
F
Ri
i
RF
V DPP
For R =
i
RF
V
= 2V
-V
OUT
i
DPP
Vi
VOUT


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