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CAT521 View Datasheet(PDF) - Catalyst Semiconductor => Onsemi

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CAT521 Datasheet PDF : 10 Pages
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CAT521
the 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 CAT521 allows temporary changes in the 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 settings may be
changed as many times as required. The temporary
setting remains in effect long as CS remains high. When
CS returns low the DPP will return to the output value
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 CAT521’s internal control circuitry discards
from the programming register the new data two clock
cycles after receiving it if no PROG signal is received.
Figure 3. Temporary Change in Output
to 1 2 3 4 5 6 7 8 9 10 11 12
N N+1 N+2
CS
DI
DO
PROG
RDY/BSY
DPP
OUTPUT
NEW DPP DATA
1 A0 A1 D0 D1 D2 D3 D4 D5 D6 D7
CURRENT DPP DATA
D0 D1 D2 D3 D4 D5 D6 D7
CURRENT
DPP VALUE
NON-VOLATILE
NEW
DPP VALUE
VOLATILE
CURRENT
DPP VALUE
NON-VOLATILE
APPLICATION CIRCUITS
+5V
Vi
Ri
RF
CONTROL
& DATA
VDD
VREFH
CAT521
GND
VREFL
+15V
+ OP 07
-15V
VOUT
VOUT
=
VDPP
(RI+RF)-VIRF
RI
For RI = RF
VOUT = 2VDPP -VI
DPP INPUT
MSB LSB
1111 1111
DPP OUTPUT
VDPP = —C2O—5D5—E (VFS- VZERO ) + VZERO
VFS = 0.99 V
VZERO = 0.01 V
—2255—55 (.98 VREF) + .01 VREF= .990 VREF
ANALOG
OUTPUT
VREF = 5V
R I = RF
VOUT = +4.90V
1000 0000
0111 1111
0000 0001
—1225—85 (.98 VREF) + .01 VREF= .502 VREF
—1225—75 (.98 VREF) + .01 VREF= .498 VREF
—215—5 (.98 VREF + .01 VREF = .014 VREF
VOUT = +0.02V
VOUT = -0.02V
VOUT= -4.86V
0000 0000 —205—5 (.98 VREF) + .01 VREF = .010 VREF
VOUT = -4.90V
CONTROL
& DATA
Bipolar DPP Output
+5V
RI
RF
VDD
VREFH
+15V
CAT521
GND
VREFL
+ OP 07
-15V
VOUT
=
(1
+
RF)
RI
VDPP
Amplified DPP Output
V OUT
7
Doc. No. 2003, Rev. F
 

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