Features
- Volatile Solid-State Potentiometer
- I2C Serial Bus Interface
- DCP Terminal Voltage, 2.7V to 5.5V
- Low Tempco
- Rheostat - 45 ppm/°C Typical
- Divider - 15 ppm/°C Typical
- 128 Wiper Tap Points
- Wiper Resistance 70Ω Typ at VCC = 3.3V
- Low Power CMOS
- Active Current, 200µA Max
- Standby Current, 500nA Max
- Available RTOTAL Values = 50kΩ, 10kΩ
- Power-on Preset to Midscale
- Packaging
- 6 Ld SC-70
- Pb-Free (RoHS Compliant)
Description
The Intersil ISL90727 and ISL90728 are digitally controlled potentiometers (XDCP™). Each device consists of a resistor array, wiper switches, and a control section. The wiper position is controlled by an I2C Bus™. The potentiometer is implemented by a resistor array composed of 127 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 SDA and SCL inputs.
Parameters
| Attributes | Value |
|---|---|
| Resistance Taper | Linear |
| Taps (#) | 128 |
| Resistance Options (kΩ) | 10, 50 |
| Channels (#) | 1 |
| Interface | I2C |
| Memory Type | Volatile |
| Supply Voltage Vcc Range | 2.7 to 5.5 |
| Supply Current Icc (µA) | 0.5 |
| Single Supply Voltage Range (V) | 0 - 5.5 |
| Wiper Current (mA) | 3 |
| Wiper Resistance (ohms) | 85 |
| VL Terminal Voltage (Min) (V) | 0 |
| VL Terminal Voltage (Max) (V) | 5.5 |
| End-to-End Temperature Coefficient (ppm/°C) | 45 |
| Middlepoint Ratiometric Tempco | 15 |
| Advanced Features | Same as ISL90728 with different I2C address; RL connected to GND |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SC70 | 2.0 x 1.2 x 0.50 | 6 | 0.7 |
Application Block Diagrams
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Smart Water Monitoring System
LTE-based water monitoring system with MQTT-based leak detection and automated valve control for remote use.
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Additional Applications
- Mechanical Potentiometer Replacement
- Transducer Adjustment of Pressure, Temperature,
- Position, Chemical, and Optical Sensors
- RF Amplifier Biasing
- LCD Brightness and Contrast Adjustment
- Gain Control and Offset Adjustment