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lamaPLC project: Digitales Potentiometer Board Moduls
A digital potentiometer (or “digipot”), such as the Renesas X9C series, is a semiconductor device that replicates the function of a mechanical potentiometer—varying resistance—but replaces the manual knob with digital control signals.
Renesas X9C series
The X9C102, X9C103, X9C104, and X9C503 are digitally controlled (XDCP) potentiometers. The device consists of a resistor array, wiper switches, a control section, and nonvolatile memory. The wiper position is controlled by a three-wire interface.
The potentiometer is implemented using a resistor array composed of 99 resistive elements and a wiper-switching network. Between each element and at either end are tap points accessible to the wiper terminal. The position of the wiper element is controlled by the CS, U/D, and INC inputs. The wiper position can be stored in non-volatile memory and recalled upon subsequent power-up.
The device can be used as a three-terminal potentiometer or a two-terminal variable resistor in a wide variety of applications, from control to signal processing to parameter adjustment.
| Model | Total Resistance (R total) | Step Size (approx.) | Temp.Coefficient | Max Terminal Voltage Differential (ΔV) |
|---|---|---|---|---|
| X9C102 | 1 KΩ | 10.1 Ω | +600 ppm/°C | 4 V |
| X9C103 | 10 KΩ | 101 Ω | +300 ppm/°C | 10 V |
| X9C104 | 100 KΩ | 505 Ω | +300 ppm/°C | 10 V |
| X9C503 | 50 KΩ | 1010 Ω | +300 ppm/°C | 10 V |
- Resolution: 100 Wiper Tap Points (0–99).
- Interface: 3-wire serial (CS, U/D, INC).
- Memory: Non-volatile EEPROM (retains position for 100 years).
- Supply Voltage (Vcc): 5V
- Resistance Tolerance: ±20% end-to-end.
- Typical Wiper Resistance: 40 Ω at 1 mA
Full datasheet: https://www.renesas.com/en/document/dst/x9c102-x9c103-x9c104-x9c503-datasheet
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