Key facts
- Brand
- Maxim
- Model
- DS1621
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-04-11
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Maxim DS1621 Digital Thermometer and Thermostat Datasheet
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.
Maxim DS1621 specifications
| 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 |
Source: Maxim DS1621 Digital Thermometer and Thermostat Datasheet
All Maxim DS1621 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What temperature range does the DS1621 measure?
It measures from –55 °C up to +125 °C.
From: Maxim DS1621 Digital Thermometer and Thermostat Datasheet
How is temperature data read from the DS1621?
Temperature is provided as a 9‑bit two’s‑complement value over the 2‑wire serial interface.
From: Maxim DS1621 Digital Thermometer and Thermostat Datasheet
What temperature range does the DS1621 cover?
It measures temperatures from –55 °C to +125 °C.
From: Maxim DS1621 Digital Thermometer and Thermostat Datasheet
What communication interface does the DS1621 use?
It uses a 2‑wire serial (I²C‑compatible) interface with SDA and SCL open‑drain lines.
From: Maxim DS1621 Digital Thermometer and Thermostat Datasheet