The DS1844 Quad Digital Potentiometer is a four-channel, digitally controlled linear potentiometer. Each potentiometer is made up of 63 equally spaced resistive sections, with three terminals accessible to the user. These include the high-end terminal, HX, wiper terminal, satellite, and the low-end terminal, LX. "Selecting the wiper position on the resistor ladder is via an 8-bit register value. Communication and control of the device supports two types of serial interfaces. These include a 5-wire I/O shift register interface and a 2-wire seekable address interface. The DS1844 is available in standard 10 kW, 50 kW and 100 kW versions. Mixed resistor combinations are also available through custom settings. The DS1844 is specified over the industrial operating temperature range: -40°C to +85°C. The DS1844's Software package, including 20-pin DIP, SOIC, and TSSOP packages. The DS1844 contains four 64-bit potentiometers. Each potentiometer is independent and has three access terminals, including HX, LX, and WX. Each potentiometer is Resistive element consisting of 63 individuals. Between each resistive element is a dig point multiplexed wiper terminal, WX. In addition, the wiper terminal can be directly multiplexed, the final terminal, HX and LX. The DS1844 supports two interface control options. These two options allow direct placement of the wiper position of the resistor ladder. Each wiper has an associated 6-bit register that holds its position value. The DS1844 is a volatile device that will always be set with the wiper in the wiper (position 32 decimal) .Terminals at the end of HX will have a wiper position value of 63 decimal and LX terminals will have a wiper position value of 0 decimal. Since the DS1844 is a 64-bit device, only 6 bits of data are necessary to write a wiper value. However, with the DS1844 The communication will need to use the full 8 bits, with the remaining 2 bits specifying the selected potential. A proper discussion of the communication protocol is under the section titled Serial Port Operation.