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參數(shù)資料
| 型號(hào)： | DS1802 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Dual Audio Taper Potentiometer with Push Button Control(帶按鈕控制的雙路音頻抽頭電位器) |
| 中文描述： | DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 65 POSITIONS, PDIP20 |
| 封裝： | 0.300 INCH, DIP-20 |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大小： | 97K |
| 代理商： | DS1802 |
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DS1802
022698 10/15
Zero–Crossing Detection
The DS1802 provides a zero–crossing detection capa-
bility when using the 3–Wire Serial interface. Zero–
crossing detection provides a means for minimizing any
audible noise that may result from sizable discrete wiper
transitions when using the part n audio applications. The
zero–crossing detect feature allows independent wiper
changes only when the two terminals of the potentiome-
ter have equal potentials and within a 50 ms time window
from the fall of the RST signal. If at 50 ms the DS1802
has not detected a zero–crossing, the wiper position of
the potentiometer(s) will change regardless of the state
of the input signal. Zero–crossing detection is activated
when the ZCEN input level is in a low–state. When high,
the ZCEN input deactivates both the 50 ms time require-
ment and zero–detection crossing.
Zero–crossing detection is also available when using the
part in push–button operation. When a push–button is
activated, the part will change wiper position during the
first detected zero–crossing or at the end of a 50 ms time
window.
When operating n push–button operation with a continu-
ous input pulse, the wiper position will change once dur-
ing the initial 1 second time period. This change is dic-
tated by a detected zero–crossing or 50 ms time window.
Subsequent changes when operating with continuous
input pulse occur on 100 ms time intervals and are
dependent on zero–crossing or 50 ms timeouts.
MUTE CONTROL
The DS1802 provides a mute control feature which can
be accessed by the user through hardware or software.
Hardware control of the device is achieved through the
MUTE input pin. This pin is internally pulled up through a
50K
resistor. When this input is driven low, the wiper
outputs of both potentiometers will be internally con-
nected to the low terminal of their respective potentiome-
ters. This input performs as a toggle input, with the first
activity on this pin connecting the wiper outputs to the ow
end of the resistive array on each potentiometer. The
next input activity on this pin will return the wiper position
to the previous state before the muting occurred. Also, if
operating n push–button mode, mute will be deactivated
if an input is received over the VU, VD, UC0, UC1, DC0,
DC1 inputs. This input, like the push–button inputs, is
internally debounced and requires no external circuitry.
When the device powers up, the first activity on the mute
pin will internally connect the wipers to the low end of the
resistor array.
Software mute control was briefly discussed in 3–wire
protocol and operation. Bits 6 and 14 of the 16–bit I/O
shift register are reserved for mute control of potentiome-
ter–0 and potentiometer–1, respectively. Unlike hard-
ware mute control, software muting allows the user indi-
vidual
control
of
each
potentiometer–0and potentiometer–1 can be indepen-
dently muted). Software muting of potentiometer–0
would require bit 6 to have a value of 1 while for poten-
tiometer–1, bit 14 should have a value 1. When the user
desires to release the mute of any potentiometer through
software the complete 16–bit I/O shift register must be
rewritten with the desired potentiometer wiper settings
and bits 6 and 14 having zero value.
potentiometer
(i.e.,
3–Wire Serial Port Vs push–button
Operation
In applications where both the 3–Wire Serial port and the
push–button inputs will be used to control the part, there
may exist times when activity is present on both control
interfaces simultaneously. This section describes how
the DS1802 handles these situations.
In all instances, the DS1802 ‘ 3–Wire serial port takes
precedence over push–button input control.
The DS1802 will not allow push–button inputs to change
wiper position during 3–Wire serial port activity.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1802+ | 功能描述:數(shù)字電位計(jì) IC Dual Audio Taper Potentiometer RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1802E | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1802E/T&R | 制造商:Maxim Integrated Products 功能描述:DUAL AUDIO TAPER W/PB TSSOP T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC POT DL AUDIO TAP W/PB 20TSSOP |
| DS1802E/T&R | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1802E+ | 功能描述:數(shù)字電位計(jì) IC Dual Audio Taper Potentiometer RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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