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PDF DS1801 Data sheet ( Hoja de datos )
| Número de pieza | DS1801 | |
| Descripción | Dual Audio Taper Potentiometer | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1801 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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DS1801
Dual Audio Taper Potentiometer
www.dalsemi.com
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
Serial port provides means for setting and
reading both potentiometers wipers
14-pin PDIP, 16-pin SOIC, and 14-pin
TSSOP packages
Operating Temperature Range:
- Industrial: -40°C to +85°C
Software mute
Resistance available: 45 kΩ
PIN DESCRIPTION
L0, L1
- Low End of Resistor
H0, H1
- High End of Resistor
W0,W1
- Wiper End of Resistor
VCC - 3V or 5V Power Supply Input
RST
D
CLK
GND
AGND
- Serial Port Reset Input
- Serial Port Data Input
- Serial Port Clock Input
- Digital Ground
- Analog Ground
ZCEN
COUT
NC
- Zero-Crossing Detect Input
- Cascade Output
- No Connect
PIN ASSIGNMENT
GND
COUT
RST
ZCEN
W0
L0
H0
1
2
3
4
5
6
7
14 VCC
13 CLK
12 D
11 AGND
10 H1
9 L1
8 W1
DS1801 14-Pin PDIP (300-mil)
DS1801 14-Pin TSSOP (173-mil)
GND
COUT
RST
ZCEN
NC
W0
L0
H0
1
2
3
4
5
6
7
8
16 VCC
15 CLK
14 D
13 NC
12 AGND
11 H1
10 L1
9 W1
DS1801S 16-PIN SOIC (300-mil)
See Mech. Drawings Section
DESCRIPTION
The DS1801 is a dual audio taper potentiometer having logarithmic resistive characteristics over the
device range. Each potentiometer provides 65 wiper positions with a 1 dB increment per step and device
mute. The 3-wire serial interface, using a CPU, provides the user the ability of reading or writing exact
wiper positions of the two potentiometers. Additionally, the part contains a zero-crossing detection
feature that minimizes noise resulting from wiper transitions. Packages for the part include a 14-pin
PDIP, 16-pin SOIC, and 14-pin TSSOP.
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1 page  
DS1801
CASCADE OPERATION
A feature of the DS1801 is the ability to control multiple devices from a single processor. Multiple
DS1801s can be linked or daisy-chained as shown in Figure 4. As a data bit is entered into the I/O shift
register of the DS1801, bit 0 of the I/O shift register will appear at the COUT output after a maximum delay
of 50 nanoseconds.
The COUT output of the DS1801 can be used to drive the D input of another DS1801. When connecting
multiple devices, the total number of bits sent is always 16 times the number of DS1801s in the daisy
chain.
An optional feedback resistor can be placed between the C OUT terminal of the last device and the D input
of the first DS1801 thus allowing the controlling processor to read as well as write data or circularly
clock data through the daisy chain. The value of the feedback or isolation resistor should be in the range
from 2 to 10 kohms.
When reading data via the COUTpin and isolation resistor, the D line is left floating by the reading device.
When RST is driven high, bit 0 is present on the COUT pin, which is fed back to the input D pin through
the isolation resistor. When the CLK input transitions low to high, bit 0 is loaded into the first position of
the I/O shift register and bit 1 becomes present on COUT and D of the next device. After 16 bits (or 16
times the number of DS1801s in the daisy chain), the data has shifted completely around and back to its
original position. When RST transitions to the low state to end data transfer, the value (the same as before
the read occurred) is loaded into wiper-0 and wiper-1.
CASCADING MULTIPLE DEVICES Figure 4
Zero-Crossing Detection
The DS1801 provides a zero-crossing detection capability that minimizes any audible noise that may
result from sizable discrete wiper transitions when using the part in audio applications. The zero-crossing
detect feature allows independent wiper changes only when the two terminals of the potentiometer have
equal potentials and are within a 50 ms time window from the fall of the RST signal. If at 50 ms the
DS1801 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 requirement and zero
detection crossing.
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5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS1801.PDF ] | |
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