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PDF DS1802 Data sheet ( Hoja de datos )
| Número de pieza | DS1802 | |
| Descripción | Dual Audio Taper Potentiometer With Pushbutton Control | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1802
Dual Audio Taper Potentiometer
With Pushbutton Control
FEATURES
§ Ultra-low power consumption
§ Operates from 3V or 5V supplies
§ Two digitally controlled, 65-position
potentiometers including mute
§ Logarithmic resistive characteristics (1 dB
per step)
§ Zero-crossing detection eliminates noise
caused by wiper movement
§ Digital or mechanical pushbutton wiper
control
§ Serial port provides means for setting and
reading both potentiometers wipers
§ 20-pin SOIC and 20-pin TSSOP for surface
mount applications
§ Operating Temperature Range:
-40°C to +85°C
§ Software and hardware mute
§ Resistance Available: 45 kΩ
PIN ASSIGNMENT
GND
COUT
CLK
D
RST
ZCEN
MODE
W0
L0
H0
1
2
3
4
5
6
7
8
9
10
20 VCC
19 VU (UC1)
18 VD (DC1)
17 B0 (UC0)
16 B1 (DC0)
15 MUTE
14 AGND
13 H1
12 L1
11 W1
20-Pin DIP (300-mil)
20-Pin SOIC (300-mil)
20-Pin TSSOP (173-mil)
See Mech. Drawings Section
PIN DESCRIPTION
L0, L1
H0, H1
W1,W2
VCC
- Low End of Resistor
- High End of Resistor
- Wiper End of Resistor
- 3V/5V Power Supply Input
RST
D
CLK
MODE
UC0, UC1
DC0, DC1
VU, VD
B0, B1
GND
MUTE
AGND
- Serial Port Reset Input
- Serial Port Data Input
- Serial Port Clock Input
- Mode Select Input
- Up Control Pushbutton Inputs
- Down Control Pushbutton
Inputs
- Volume-Up/Volume-Down
Inputs
- Balance Pot-0, Pot-1 Inputs
- Digital Ground
- Mute
- Analog Ground
ZCEN
COUT
- Zero-Crossing Detect Input
- Cascade Output
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SINGLE PUSHBUTTON CONFIGURATION Figure 2(a)
DS1802
DUAL PUSHBUTTON CONFIGURATION Figure 2(b)
Contact closure is defined as the transition from a high level to a low level on the contact closure input
terminals. The DS1802 interprets input pulse widths as the means of controlling wiper movement. A
single pulse input over the UCx or DCx input terminals will cause the wiper to move one position. A
transition from high to low on these inputs is considered the beginning of pulse activity or contact
closure. A single pulse is defined as being greater than 1 ms but lasting no longer than a second. This is
shown is Figure 4(a).
Repetitive pulsed inputs can be used to step through each resistive position of the device in a relatively
fast manner (see Figure 4(b)). The requirement for repetitive pulsed inputs is that pulses must be
separated by a minimum time of 1 ms. If not, the DS1802 will interpret repetitive pulses as a single pulse.
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DS1802
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 50 kΩ resistor. When this input is driven low, the wiper outputs of both
potentiometers will be internally connected to the low terminal of their respective potentiometers. This
input performs as a toggle input, with the first activity on this pin connecting the wiper outputs to the low
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 in pushbutton mode, mute
will be deactivated if an input is received over the VU, VD, UC0, UC1, DC0, DC1 inputs. This input, like
the pushbutton 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 potentiometer-0 and potentiometer-1, respectively.
Unlike hardware mute control, software muting allows the user individual control of each potentiometer
(i.e., potentiometer-0 and potentiometer-1 can be independently muted). Software muting of
potentiometer-0 would require bit 6 to have a value of 1 while for potentiometer-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 0 value.
3-Wire Serial Port Vs. Pushbutton
Operation
In applications where both the 3-wire serial port and the pushbutton inputs will be used to control the
part, there may be 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 pushbutton input control.
The DS1802 will not allow pushbutton inputs to change wiper position during 3-wire serial port activity.
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet DS1802.PDF ] | |
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