Overview
The DS3903 contains three nonvolatile (NV) low-temperature coefficient digital potentiometers, which can be accessed through a 2-wire bus. It operates in both 3V and 5V systems, and it features a write-protect pin that can lock the positions of the potentiometers. An address pin allows two DS3903s to be placed on the same 2-wire bus
| Part Number | DS3903, DS3903E-020 |
| Function | Triple 128-Position Nonvolatile Digital Potentiometer |
| Package | 20-Pin TSSOP type |
| Manufacturer | Maxim Integrated |
| Datasheet | Download PDF  |
DS3903 Features
- Three 128-Position Linear Potentiometers (Two 10kW, One 90kW)
- NV Wiper Storage
- 0 to 5.5V on Any Potentiometer Terminal Independent of VCC
- Low End-to-End Temperature Coefficient
- Operates on an Industry-Standard 2-Wire Bus
- Write-Protect Pin
- Supply Voltage: 3V or 5V
- Operating Temperature Range: -40°C to +85°C
- Packaging: 20-Pin TSSOP
DS3903 Specifications
| The voltage on VCC Pin Relative to the Ground | The voltage on VCC Pin Relative to Ground |
| The voltage on VCC Pin Relative to the Ground | -0.5V to VCC + 0.5V |
| Voltage on L0, L1, L2, W0, W1, W2, H0, H1, and H2 Relative to Ground | -0.5V to +6.0V |
| Current Through W0, W1, and W2 | ±4mA |
| Operating Temperature Range | -40°C to +85°C |
| Programming Temperature Range | 0°C to +70°C |
| Storage Temperature Range | -55°C to +125°C |
| Soldering Temperature | See IPC/JEDEC J-STD-020A Specification |
DS3903 Pinout
Pin Definitions
| PIN | NAME | FUNCTION |
| 1 | SDA | 2-Wire Serial Data. Input/output for 2-wire data. |
| 2 | SCL | 2-Wire Serial Clock. Input for 2-wire clock. |
| 3 | A0 | Address-Select Input. Determines device 2-wire address. |
| 4 | WP | Write-Protect Input. Must be grounded to write to the potentiometer registers. An internal pullup locks the potentiometer positions if this pin is not connected. |
| 5, 16, 17 18, 19 | N.C. | No Connection |
| 6, 8, 9 | L0, L1, L2 | Potentiometer Low Terminals. Voltages on these pins should remain between GND and +5.5V while VCC is above +2.7V. Low terminals can be at potentials above the wiper or high terminals. |
| 7, 12, 14 | W1, W2, W0 | Potentiometer Wiper Terminal. Voltages on these pins should remain between GND and +5.5V while VCC is above +2.7V. |
| 10 | GND | Ground Terminal |
| 11, 13, 15 | H2, H1, H0 | Potentiometer High Terminals. Voltages on these pins should remain between GND and +5.5V while VCC is above +2.7V. High terminals can be at potentials below the low terminals. |
| 20 | VCC | Supply Voltage Terminal |
Applications
- A Small and Low-Cost Replacement for Mechanical Potentiometers
- Fiber Optic Transceiver Modules
- Mobile Phones and PDAs
- Portable Electronics
- Power Supply Calibration
DS3903 Datasheet
Download the DS3903 IC Datasheet from the link given below.
