CAT524LI-T2 datasheet(8/15 Pages) ONSEMI

Part #	CAT524LI-T2

Description	Quad Digitally Programmable Potentiometer (DPPtm) with 256 Taps and Microwire Interface

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Manufacturer	ONSEMI [ON Semiconductor]

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8 / 15 page

CAT524

Not Recommended for New Design

Doc. No. MD-2006 Rev. I

8

Characteristics subject to change without notice

READING DATA

Each time data is transferred into a DPP wiper control

register currently held data is shifted out via the D0

pin, thus in every data transaction a read cycle

occurs. Note, however, that the reading process is

destructive. Data must be removed from the register

in order to be read. Figure 2 depicts a Read Only

cycle in which no change occurs in the DPP’s output.

This feature allows µPs to poll DPPs for their current

setting without disturbing the output voltage but it

assumes that the setting being read is also stored in

non-volatile memory so that it can be restored at the

end of the read cycle. In Figure 2 CS returns low

before the 13th clock cycle completes. In doing so the

non-volatile memory setting is reloaded into the DPP

wiper control register.

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 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.

Figure 2. Reading from Memory

Figure 3. Temporary Change in Output

A0

A1

1

DO

DI

CS

PROG

DPP

OUTPUT

t

1

2

3

4

5

6

7

8

9

10

11

12

o

CURRENT

DPP VALUE

NON-VOL ATILE

D0

D1

D2

D3

D4

D5

D6

D7

CURRENT DPP DATA

RDY/BSY

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-VOL ATILE

NEW

DPP VALUE

VOLATILE

CURRENT

DPP VALUE

NON-VOL ATILE

RDY/BSY

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CAT524LI-T2 Datasheet(PDF) 8 Page - ON Semiconductor

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