DS1859 Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors
The DS1859 is a dual, temperature‑controlled, non‑volatile variable resistor offering two 50 kΩ or two 20 kΩ, 256‑position linear resistors. It provides five monitored channels (Temperature, VCC, MON1, MON2, MON3) and a direct‑to‑digital temperature sensor, all accessible via a 2‑wire serial interface.
The device includes EEPROM storage for resistor settings, supports external analog inputs, and operates from a 3.3 V or 5 V supply across an industrial temperature range. Detailed electrical characteristics, timing diagrams, and programming procedures are provided for system integration.
| Supply Voltage (VCC) | 2.85 V to 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +95 °C |
| Resistor Options | Two 50 kΩ or two 20 kΩ, 256‑position linear |
| Monitored Channels | 5 (Temperature, VCC, MON1, MON2, MON3) |
| EEPROM Size | 128 × 8 bits |
The device operates with a supply voltage between 2.85 V and 5.5 V.
It is rated for operation from –40 °C up to +95 °C.
Each resistor offers 256 linear positions.