DS1802S

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Data Acquisition – Digital Potentiometers

DS1802S is a digital potentiometer made by Maxim Integrated, widely used as a variable resistor in various electronic applications. It is a dual-axis device that features a 7-bit resolution per axis, offering up to 128 distinct resistance steps. This single-chip solution helps to save space and improve the overall system performance. DS1802S is targeted towards industrial, consumer, medical, networking, and communication (NFC) applications.

Application Field

DS1802S can be used as an adjustable resistor or a digital potentiometer in a variety of applications, from consumer goods to industrial products. For example, it can be used to adjust the gain of transducers such as IMU (Inertial Measurement Units) for consumer and industrial applications, adjust the sensitivity of microphones for an audio system, and stored programming data for recall automation. It is also used in systems such as motor control, LCD and LED displays, voltage regulators, and a wide range of other applications.

In the consumer electronics and digital audio domain, it enables low-noise, high-linearity potentiometers, continuous volume control and finer vocal level adjustments. It is also used in touch detection and tracking, replacing mechanical knobs and switches. Additionally, automotive, LED lighting, and IoT applications all benefit from the integrated design of DS1802.

Working Principle

The DS1802 is an adjustable, dual-axis digital potentiometer. It is a two-channel device with a 7-bit resolution per axis, providing 128 distinct resistance steps. The resistance steps are generated by adjusting the selection voltage of two internal thin-film resistors. The digital interconnections are used for control and communication between the devices and the host.

The DS1802 can be controlled through either digital input pins or via the serial I²C or SPI interface. The devices feature active charge pump circuitry for low power consumption, and thin-film resistors for high accuracy and low noise performance. The digital potentiometers also feature a power-on reset that maintains the output in a predetermined state.

The device operates using a supply voltage range from 1.8V up to 5.5V and also features a volatile RAM that can be programmed via the I²C/SPI interface. The volatile RAM stores the current setting of the device when the power is removed and can be used to store user-defined settings. When the power is applied, the current RAM setting is recalled and stored in the device, allowing fast and accurate operation.

In summary, the DS1802 is an ideal solution for applications such as volume control, variable gain control, and variable voltage regulation. It is a low-power, space-saving alternative to traditional variable resistors, and provides high accuracy and stable performance at an affordable cost.

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