DS1721：Digital Thermometer and Thermostat
The DS1721 digital thermometer and thermostat features ±1°C accuracy over a -10°C to +85°C range. Thermometer data is read out over a 2-wire serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable). The DS1721 features three address inputs, allowing users to multidrop up to eight DS1721 devices on one bus. The DS1721 offers thermostatic functionality with over-temperature (TH) and under-temperature (TL) user-programmable trip-points stored in on-chip SRAM. The two trip-points provide programmable thermostat hysteresis: the thermostat output is asserted when the measured temperature exceeds TH and it remains active until the temperature falls below TL. The DS1721 is available in 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages. For applications requiring higher precision, the DS1631 provides ±0.5°C accuracy and is functionally compatible with the DS1721.
Key Features
| DS1721: Functional Block Diagram Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| DS1721 Data Sheet | DS1721.pdf |
Parametrics
| Part Number | Sensor Type | Interface | Channels | Accuracy (±°C) | Parasite Pwr. | Temp. Thresh. | Temp. Resolution (bits) | Multi Droppable | Oper. Temp. (°C) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|
| See Notes | |||||||||||
| DS1721 | Local | 2-Wire/I2C/SMBus | One | 1 | No | Programmable | 9 10 11 12 | Yes | -55 to +125 | µMAX/8 SOIC(N)/8 | $1.80 @1k |
Quality and Environmental Data
Related Products
- DS1631：High-Precision Digital Thermometer and Thermostat
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| DS1721S | No Longer Available | DS1721S+ | SOIC(N),;8 pin;30.9 mm² | -55°C to +125°C | No |
| DS1721S+ | Active | SOIC(N),;8 pin;30.9 mm² | -55°C to +125°C | Lead Free | |
| DS1721S+T&R | Active | SOIC(N),;8 pin;30.9 mm² | -55°C to +125°C | Lead Free | |
| DS1721S/T&R | No Longer Available | DS1721S/T&R+W | SOIC(N),;8 pin;30.9 mm² | -55°C to +125°C | No |
| DS1721S/T&R+W | Active | SOIC(N),;8 pin;30.9 mm² | -55°C to +125°C | Lead Free | |
| DS1721U | No Longer Available | DS1721U+ | µMAX,;8 pin;15.6 mm² | -55°C to +125°C | No |
| DS1721U+ | Active | µMAX,;8 pin;15.6 mm² | -55°C to +125°C | Lead Free | |
| DS1721U+T&R | Active | µMAX,;8 pin;15.6 mm² | -55°C to +125°C | Lead Free | |
| DS1721U/T&R | No Longer Available | DS1721U/T&R+W | µMAX,;8 pin;15.6 mm² | -55°C to +125°C | No |
| DS1721U/T&R+W | Active | µMAX,;8 pin;15.6 mm² | -55°C to +125°C | Lead Free |
- DS1721.pdf DS1721
- DS1721.pdf DS1721
- DS1721.pdf DS1721
- Understanding Multidrop Address Assignments for Thermal Sensors MAX7504
- Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices MAX31826
- Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621 DS1721
- DS1721.pdf DS1721
- DS1721.pdf DS1721
