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Summit Microelectronics

SMP9517 Datasheet Preview

SMP9517 Datasheet

Electronic Potentiometer

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SUMMIT
MICROELECTRONICS, Inc.
Nonvolatile DACPOT™ Electronic Potentiometer
With Debounced Push Button Interface
SMP9517
FEATURES
Digitally Controlled Electronic Potentiometer
• 7-Bit Digital-to-Analog Converter (DAC)
– Independent Reference Inputs
– Differential Non-Linearity of ±0.5LSB max
– Integral Non-Linearity of ±1LSB max
www.DataSheet4UV.cOomUT Value in EEPROM for Power-On Recall
– Equivalent to 128-Step Potentiometer
• Unity Gain Op Amp Drives up to 1mA
• Simple Trimming Adjustment
– Debounced Pushbutton Interface
• Low Noise Operation
• “Clickless” Transitions between DAC Steps
• No Mechanical Wear-out Problem
– 1,000,000 Stores (typical)
– 100 Year Data Retention
• Operation from 2.7V to 5.5V Supply
• Low Power: 1mW max at 5V
OVERVIEW
The SMP9517 DACPOT trimmer is an 7-bit nonvolatile
DAC designed to replace mechanical potentiometers.
The SMP9517 includes a unity-gain amplifier to buffer the
DAC output and enables VOUT to swing from rail to rail.
The DACPOT trimmer operates over a supply voltage
range of 2.7V to 5.5V.
The SMP9517’s simple pushbutton input provides an ideal
interface for operator adjusted equipment. This interface
allows for quick and easy adjustment of even the most
sophisticated systems.
The SMP9517 is a pin-compatible performance upgrade
for other industry nonvolatile potentiometers. For higher
resolution applications the pin-compatible S9518 pro-
vides 256 steps with the same pushbutton interface. Both
the SMP9517 and the S9518 provide ‘clickless’ transitions
of VOUT.
FUNCTIONAL BLOCK DIAGRAM
VDD
8
7-Bit
E2PROM
Debounce Circuit
& Write Control
Logic
7-Bit Data
Register
1 27
UP# DWN# STR#
4
GND
7-Bit DAC
3 VH
5 VOUT
6 VL
2035 T BD 3.0
© SUMMIT MICROELECTRONICS, Inc. 2000 • 300 Orchard City Drive, Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • Fax 408-378-6586 • www.summitmicro.com
Characteristics subject to change without notice
2035 3.0 5/10/00
1




Summit Microelectronics

SMP9517 Datasheet Preview

SMP9517 Datasheet

Electronic Potentiometer

No Preview Available !

SMP9517
PIN NAMES
PINOUT
Symbol
Description
UP#
DWN#
VH
GND
PB input, moves VOUT toward VH input
PB input, moves V toward V input
OUT
L
VREF high
Ground
VOUT
www.DataSheet4U.comVL
STR#
VDD
Trimmed voltage output
VREF low
Store input, providing a control input
to initiate a store operation
Supply voltage (2.7V to 5.5V)
2035 Table01 3.0
Analog Section
The SMP9517 is an 7-bit, voltage output digital-to-analog
converter (DAC). The DAC consists of a resistor network
that converts 7-bit digital values into equivalent analog
output voltages in proportion to the applied reference
voltage.
Reference Inputs
The voltage differential between the VL and VH inputs sets
the full-scale output voltage range. VL must be equal to or
greater than ground (a positive voltage). VH must be
greater than VL and less than or equal to VDD. See
specifications for guaranteed operating limits.
Output Buffer Amplifier
The voltage output is from a precision unity-gain follower
that provides a rail-to-rail output swing.
Digital Interface
The interface provides simple pushbutton control of an
up/down counter that drives the DAC. The DAC output is
a ratiometric voltage output.
UP# is an active low pushbutton input. An internal pull-up
resistor, with nominal value of 50k, eliminates an exter-
nal resistor. A 30ms debounce period is included in the
input timing to prevent multiple pulsing of the counter.
Either a switch closure to ground or a low logic level will,
after the debounce time, change the potentiometer tap
position. UP# moves the output voltage towards the VH
reference input.
If the UP# pushbutton is kept depressed the counter will
continue to increment at the rate of one count every
250ms for one second. After one second the counter
increments faster, one count every 50ms, until the
pushbutton is released. Changes to the DAC output using
the UP# input do not alter the data stored in EEPROM.
8-Pin SOIC
UP#
DWN#
VH
GND
1
2
3
4
8 VDD
7 STR#
6 VL
5 VOUT
2035 T PCon 3.0
DWN# is an active low pushbutton input that decrements
the counter and moves the potentiometer output voltage
towards the VL reference input. The DWN# control input
also includes an internal 50kpull-up resistor and a 30ms
debounce period to prevent multiple pulsing. A low logic
level will also change the potentiometer tap position after
the debounce period.
If the DWN# pushbutton is kept depressed the counter
continues to decrement at the rate of one count every
250ms for one second. After one second the counter
decrements at one count every 50ms until the pushbutton
is released. Changes to the DAC output using the DWN#
input do not alter the data stored in EEPROM.
STR# This input can be used in two ways:
1) If the input is tied low, then AUTOSTORE is enabled.
When VDD powers down, an automatic store cycle
takes place that updates the nonvolatile EEPROM
memory.
2) STR# is an active low pushbutton input that also
updates the nonvolatile memory. The input is
debounced but does not have an internal pull-up
resistor. For every valid push the SMP9517 will store
the current potentiometer position to EEPROM.
2
2035 3.0 5/10/00
SUMMIT MICROELECTRONICS, Inc.


Part Number SMP9517
Description Electronic Potentiometer
Maker Summit Microelectronics
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