CAT524WI-TE10 datasheet(7/13 Pages) CATALYST

Part #	CAT524WI-TE10

Description	Configured Digitally Programmable Potentiometer

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Manufacturer	CATALYST [Catalyst Semiconductor]

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7 / 13 page

CAT524

7

Doc. No. 2006, Rev. E

OPT 504

GND

VDD

VREFH

VREFL

CONTROL

& DATA

+

–

OP 07

VOUT

-15V

+15V

+5V

RR

i

F

V

= (1 + –––) V

OUT

DPP

RF

R I

APPLICATION CIRCUITS

Since this value is 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 CAT524 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 four DPPs in any order or sequence.

The temporary setting(s) remain in effect long as CS

remains high. When CS returns low all four DPPs will

return to the output values stored in non-volatile memory.

When it is desired to save a new setting acquired using

Figure 3. Temporary Change in Output

this feature, the new value must be reloaded into the

DPP control register prior to programming. This is

because the CAT524’s internal control circuitry discards

the new data from the programming register two clock

cycles after receiving it (after reception is complete) if no

PROG signal is received.

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

Bipolar DPP Output

Amplified DPP Output

CAT524

MSB

LSB

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

—— (.98 V

) + .01 V

= .010 V

V

= -4.90V

REF

IF

V

= 5V

REF

255

OUT

DPP INPUT

DPP OUTPUT

ANALOG

R = R

OUTPUT

REF

OUT

128

255

127

255

REF

OUT

1

255

REF

OUT

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

GND

VDD

VREFH

VREFL

CONTROL

& DATA

+

–

OP 07

(

) -V RF

R +

i

-15V

+15V

+5V

RR

i

F

Ri

i

RF

VDPP

For R =

i

RF

V

= 2V

-V

OUT

i

DPP

Vi

VOUT

OUT

V

=

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