DS1267-100

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Data Acquisition - Digital Potentiometers - DS1267-100 Application Field and Working Principle.

The DS1267-100 is a digitally controlled dual adjustable potentiometer, that is part of the family of digitally controlled devices developed by Dallas Semiconductor (DS). It is composed of two digitally-controlled components mounted onto an thin, low-profile printed circuit board, allowing for usage in tight spaces. The device itself is often referred to as a digital potentiometer, since the two sides of it mimic a traditional potentiometer (pot)’s resistance.

The DS1267-100 contains two user-adjustable resistance elements on each side, allowing the user to fine-tune the resistance on each side separately with 12-bit resolution. These two resistance elements present two separate, parallel paths of low-resistance, and can be used in an optional configuration with either one of them behaving as a voltage divider, or as a current divider. The DS1267-100 also offers 34 available resistance values. Autopoint, which is an algorithm used by Dallas Semiconductor, allows the user to set the maximum possible resistance that still fits the requirements of the application.

The primary application of the DS1267-100 is in systems requiring digital adjustment of the resistance. The device can be used in a wide variety of areas, including automotive electronics, power supplies, consumer audio systems and a variety of other consumer products, as well as industrial automation systems that call for precise digital control of the resistance. The device is also used in various impedance matching circuits, like those for amplifiers, where the user needs to be able to adjust the resistance of the circuit. Furthermore, due to its low-profile packaging, it is suitable for use in portable electronics.

As mentioned, the device consists of two resistance elements, and it is important to note that the two halves are not connected with each other. Instead each output is individually connected to the adjustment pin of its corresponding wiper. The draw of the wiper is also provided with a static current path, in order to avoid any voltages or currents that can damage the device.

On the architecture level, the DS1267-100 contains three operational control pins. The INC-pin allows the user to increase the resistance by several steps; the DEC-pin allows them to decrease the resistance; and the LOAD pin enables the user to save the actual resistance value of the two wiper elements to its internal non-volatile EEPROM. This way, the device may store several latching states and it is able to remember these settings even when power is removed for a few days.

The DS1267-100 also features optional interrupts that allow the user to monitor the resistance values, and reset the device, when the wiper elements arrive at the eeprom stored settings. The device can be easily programmed using a serial digital data bus such as I2C or SPI, however even simpler and more cost-efficient solutions can be used, due to the device’s simple communication interfaces.

To sum it up, the DS1267-100 enables users to control two imaginary rotary knobs – with only a few pins – to get precise resistance values which fit the system requirements. It can be used in many application fields, with any microcontroller on board, hence providing a great way of controlling and fine-tuning the system, while keeping the device relatively small in size.

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