Quad Digital Potentiometer - Dallas Semiconductor
Description
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DS1844 Quad Digital Potentiometer
PIN ASSIGNMENT
PS H2 H3 W3 L3 L2 W2 R/W, A0 A2, RST GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC H1 H0 W0 L0 L1 W1 SCL, CLK SDA, DIN A1, DOUT
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FEATURES
§ § § Four independent, digitally controlled 64position potentiometers Two interface control options - 5-wire serial - 2-wire addressable Standard resistance values - DS1844-010 10 kW - DS1844-050 50 kW - DS1844-100 100 kW Mixed resistor value combinations (contact factory for availability) Operating Temperature Range - Industrial: -40°C to +85°C
§ §
Device Description 20-Pin SOIC (300-mil)
20-Pin TSSOP (173-mil)
20-Pin DIP (300-mil)
PIN DESCRIPTION
VCC PS A0, A1, A2 SDA SCL R/ W
RST
DIN CLK DOUT H0-H3 L0-L3 W0-W3 GND
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2.
7V to 5.
5V Port Select Device Select Pins (2-Wire) Serial Data I/O (2-Wire) Serial Clock (2-Wire) Read/Write enable (5-Wire) Serial Port Reset Input (5-Wire) Serial Port Data Input (5-Wire) Serial Port Clock Input (5-Wire) Cascade Data Output (5-Wire) High-end Terminal of Pot Low-end Terminal of Pot Wiper Terminal of Pot Ground
DESCRIPTION
The DS1844 Quad Digital Potentiometer is a four-channel, digitally controlled linear potentiometer.
Each potentiometer is comprised of 63 equi-resistive sections and has three terminals accessible to the user.
These include the high side terminals, HX, the wiper terminals, WX, and the low-side terminals, LX.
The wiper position on the resistor ladder is selected via an 8-bit register value.
Communication and control of the device are supported by two types of serial interface.
These include a 5-wire I/O shift register interface and a 2-wire addressable interface.
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DS1844
The DS1844 is available in standard 10 kW, 50 kW, and 100 kW versions.
Mixed resistor combinations are also available through custom setups.
The DS1844 is specified to operate over the industrial temperature range: -40°C to +85°C.
Packages for the DS1844 include 20-pin DIPs, SOICs, and TSS...
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