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參數(shù)資料
| 型號(hào)： | S9518S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Nonvolatile DACPOT Electronic Potentiometer With Debounced Push Button Interface |
| 中文描述： | 非易失DACPOT電子電位隨著去抖按鈕接口 |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大小： | 43K |
| 代理商： | S9518S |
2
S9518
2017-04 4/24/99
Analog Section
The S9518 is an 8-bit, voltage output digital-to-analog
converter (DAC). The DAC consists of a resistor network
that converts 8-bit digital values into equivalent analog
output voltages in proportion to the applied reference
voltage.
Reference Inputs
The voltage differential between the V
L
and V
H
inputs
sets the full-scale output voltage range. V
L
must be equal
to or greater than ground (a positive voltage). V
H
must be
greater than V
L
and less than or equal to V
DD
. See
specifications on page 5 for guaranteed operating limits.
Output Buffer Amplifier
The voltage output is from a precision unity-gain follower
that can slew up to 1V/
μ
s.
Digital Interface
The interface provides simple push button control of an
up/down counter that drives the DAC. The DAC output is
a ratiometric voltage output.
UP
is an active low push-button input. An internal pull-up
resistor, with nominal value of 50kohm, eliminates an
external resistor that would be required with push button
control. 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 V
H
reference
input. If the
UP
push-button is kept depressed, the
counter will continue to increment at the rate of one count
every 250ms for one second. After one second the
PINOUT
UP
DWN
VH
GND
8
7
6
5
V
DD
STR
VL
VOUT
1
2
3
4
2017 ILL1.1
counter increments faster, one count every 50ms, until
the push-button is released. Changes to the DAC output
using the
UP
input do not alter the data stored in
EEPROM. The
STR
input updates the nonvolatile
EEPROM memory.
DWN
is an active low push-button input that decrements
the counter and moves the potentiometer output voltage
towards the V
L
reference input. The
DWN
control input
also includes an internal 50kohm pull-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
push-
button is kept depressed, the counter continues to decre-
ment at the rate of one count every 250ms for one second.
After one second the counter decrements at one count
every 50ms until the push-button 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 en-
abled. When V
DD
powers-down an automatic store
cycle takes place that updates the nonvolatile
EEPROM memory.
2)
STR
is an active low push-button 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 S9518 will store the
current potentiometer position to EEPROM.
PIN NAMES
Symbol
Description
UP
PB Input, Moves V
OUT
Toward
V
H
Input
DWN
PB Input, Moves V
OUT
Toward
V
L
Input
V
H
Vref High
GND
Ground
V
OUT
Trimmed Voltage Output
V
L
Vref Low
STR
Store Input, Providing a Control
Input to Initiate a Store Operation
V
DD
Supply Voltage (2.7V to 5.5V)
2017 PGM T1.0
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