SMP9517S datasheet(3/8 Pages) SUMMIT

Nome de Peças	SMP9517S

Descrição Electrónicos	Nonvolatile DACPOT??Electronic Potentiometer With Debounced Push Button Interface

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Fabricante Electrônico	SUMMIT [Summit Microelectronics, Inc.]

Página de início	http://www.summitmicro.com

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SMP9517

3

SUMMIT MICROELECTRONICS, Inc.

2035 3.0 5/10/00

There are five main blocks to the SMP9517: an 7-bit

EEPROM memory; input debounce circuits, control logic,

and 7-bit counter; 7-bit data register; decode section and

resistor ladder (DAC); and the buffer amplifier.

The input control section operates just like an up/down

counter. The output of this counter is fed to the data

register and then decoded to activate one of 127 electronic

switches connected to the resistor ladder. The ladder is

comprised of 128 resistors of equal value connected in

series. At the bottom of the ladder and at the junctions of

the resistors there are electronic switches that transfer the

voltage at each point to the buffer amplifier and then to the

output.

The SMP9517 is designed to interface directly to two

pushbutton switches that effectively move the potentiom-

eter wiper up or down. The UP# and DWN# inputs,

respectively, increment or decrement the 7-bit counter.

The data input to the DAC is decoded to select one of the

128 wiper positions along the resistive ladder. The wiper

increment input UP# and the wiper decrement input

DWN# are connected to internal pull-ups so that they

normally remain high. When pulled low by an external

pushbutton switch or a logic low level input, the wiper will

be switched to the next adjacent tap position. Internal

debounce circuitry prevents inadvertent switching of the

wiper position if UP# or DWN# remain low for less than

30ms (typical).

Each of the buttons can be pushed either once for a single

increment/decrement or held low continuously for multiple

increments/decrements. The number of increments/dec-

rements of the wiper position depends on how long the

button is pushed. When making a continuous push, after

the first second, the increment/decrement speed in-

creases. For the first second the device will be in the slow

scan mode. Then, if the button is held for longer than one

second, the device will go into the fast scan mode. As soon

as the button is released the SMP9517 will return to a

standby condition.

The DAC, whether set to 00HEX or FFHEX, acts like its

mechanical equivalent and does not move beyond the last

position. That is, the counter does not wrap around when

clocked up to FFHEX or down to 00HEX.

AUTOSTORE

The value of the counter is stored in EEPROM memory

whenever the chip senses a power-down of VDD while

STR# is enabled (held low). When power is restored the

contents of the memory are recalled and the counter reset

to the last value stored. If AUTOSTORE is to be imple-

mented, STR# is typically hard wired to GND. If STR# is

held high during power-up and then taken low the wiper will

not respond to the UP# or DWN# inputs until STR# is

brought high and the store is complete. See Figure 1.

Manual (Pushbutton) Store

When STR# is not enabled (held high) a pushbutton switch

may be used to pull STR# low and released to perform a

manual store of the wiper position in EEPROM memory.

See Figure 2.

Effect of VDD Removal

The resistor ladder, connected between VH and VL, does

not change value when VDD is removed. However, the

buffer amplifier no longer functions, and consequently a

high impedance appears at the VOUT pin.

Figure 2: Typical circuit with STR store pin

controlled by push button switch

Figure 1: Typical circuit with STR store pin used in

AUTOSTORE mode

DEVICE OPERATION

UP#

DWN#

VH

GND

VDD

STR#

VL

VOUT

8

7

6

5

1

2

3

4

VDD

3.3µF

2035 T Fig01 3.0

UP#

DWN#

VH

GND

VDD

STR#

VL

VOUT

8

7

6

5

1

2

3

4

VDD

20k

Ω

2035 T Fig02 3.0

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