This product is a thermometer and thermostat. It can measure temperature, including range, resolution, power supply voltage, temperature conversion time, data reading and writing mode, application scenarios.
The DS1621 is a digital thermometer and thermostat that measures temperature from –55 °C to +125 °C in 0.5 °C steps. Temperature data is output as a 9‑bit two’s‑complement value over a 2‑wire serial bus, and user‑defined high (TH) and low (TL) temperature thresholds are stored in non‑volatile memory for thermostat operation.
The device operates from a 2.7 V to 5.5 V supply, supports both standard (100 kHz) and fast (400 kHz) I²C‑compatible bus speeds, and offers continuous‑conversion or one‑shot modes. Electrical characteristics, pin assignments, and timing diagrams are detailed for system integration.
| Temperature range | -55 °C to +125 °C |
|---|---|
| Temperature resolution | 0.5 °C increments |
| Supply voltage | 2.7 V to 5.5 V |
| Temperature data format | 9‑bit two’s‑complement |
| Conversion time | 750 ms |
| I²C clock speed (fast mode) | 400 kHz |
| Input capacitance (typical) | 5 pF |
It measures from –55 °C up to +125 °C.
Temperature is provided as a 9‑bit two’s‑complement value over the 2‑wire serial interface.
High (TH) and low (TL) temperature thresholds are stored in non‑volatile registers and control the thermostat output.
The device operates from 2.7 V to 5.5 V.