TPL0102-100RUCR vs TPL0501-100DCNR
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| Category | Digital Potentiometers ICs | Digital Potentiometers ICs |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | IC DGT POT 100KOHM 256TAP 14QFN | IC DGTL POT 100KOHM 256TAP SOT23 |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | - | - |
| Features | Selectable Address | - |
| Interface | I²C | SPI |
| Voltage - Supply | 2.7V ~ 5.5V, ±2.25V ~ 2.75V | 2.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 14-XFQFN | SOT-23-8 |
| Supplier Device Package | 14-QFN (2x2) | SOT-23-8 |
| Tolerance | ±20% | ±20% |
| Number of Circuits | 2 | 1 |
| Configuration | Potentiometer | Potentiometer |
| Memory Type | Non-Volatile | Volatile |
| Taper | Linear | Linear |
| Number of Taps | 256 | 256 |
| Resistance (Ohms) | 100k | 100k |
| Temperature Coefficient (Typ) | 92ppm/°C | 35ppm/°C |
| Resistance - Wiper (Ohms) (Typ) | 25 | 25 |
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1. What is a digital potentiometer IC?
A digital potentiometer IC is a new type of CMOS digital and analog mixed signal processing integrated circuit that generates an analog output through digital input control and can replace traditional mechanical potentiometers. Digital potentiometers are also called programmable resistors or digitally controlled programmable resistors. They achieve circuit adjustment through CPU digital communication without the need to build a complex circuit environment.
Digital potentiometer ICs have many unique features and advantages. First, they do not require a wiper, making them more rugged and reliable. Second, digital potentiometers can be controlled, set, and change resistance values or voltage divider ratios through processors and software, providing flexibility and precision that mechanical devices cannot match. In addition, digital potentiometers can also be remotely adjusted through firmware to meet the requirements of high reliability and precise control.
There are several factors to consider when selecting a digital potentiometer IC. First, select the number of potentiometers and the number of sliders based on application requirements. Second, consider the resistance value of the resistor and whether there is a buffer contact. Finally, you also need to consider the packaging form and whether you need to remember the position when power is off. -
2. What is the value of a digital potentiometer?
The value of a digital potentiometer depends on its wiper position and bit value. The value of a digital potentiometer is usually determined by its tap position. The more taps, the higher the resolution and the finer the value change. For example, an 8-bit digital potentiometer has 256 taps, while a 5-bit digital potentiometer has 32 taps.
The value of a digital potentiometer can be changed by programming its tap position. For example, when the potentiometer is coded in the middle position, the upper and lower resistance values are equal; at the full scale position, the upper resistance is 0 and the lower resistance is the maximum value; at the 0 position, the lower resistance is 0 and the upper resistance is the maximum value. Specifically, the value range and accuracy of a digital potentiometer depend on its design and bit value. For example, an 8-bit digital potentiometer can provide 256 different resistance values, while a 5-bit digital potentiometer provides 32 different resistance values. -
3. What are the components of a digital potentiometer?
A digital potentiometer mainly consists of two parts: a voltage divider and a controller.
The voltage divider consists of a series of resistor elements that divide the input voltage according to a certain ratio. Each resistor element is connected to the input pin of the controller. The controller is responsible for reading the control signal and opening or closing the corresponding switch according to the level of the signal, thereby changing the total resistance. -
4. What is the difference between potentiometers and digital potentiometers?
The main difference between potentiometers and digital potentiometers is their working principle, structure and application scenarios.
Potentiometer is a traditional electronic component that adjusts the resistance value mechanically. Potentiometers usually consist of a resistor and a movable brush. When the brush moves on the resistor, the resistance value can be changed, thereby adjusting the current or voltage in the circuit. The structure of the potentiometer is relatively simple. It mainly consists of a resistor and a rotating or sliding system. The resistance value is changed by manually adjusting the shaft or slider.
Digital potentiometer is a programmable electronic component that controls the resistance value through digital signals. It consists of a register unit and a digital isolator. The digital isolator can be a matrix, tree or serial type. Digital potentiometers do not require mechanical contacts and control the resistance value through a microprocessor and digital signals. They have high precision and flexibility. Digital potentiometers are more accurate and reliable when adjusting circuit parameters and are not easily affected by wear or environment.
