Overview
The STCN75DS2F, produced by STMicroelectronics, is a high-precision digital CMOS temperature sensor IC. It features a sigma-delta temperature-to-digital converter and an I2C-compatible serial digital interface. This device is designed for various applications, including personal computers, system thermal management, electronics equipment, and industrial controllers. The STCN75DS2F is packaged in an industry-standard 8-lead TSSOP package and is pin-for-pin and software compatible with the TCN75, making it a drop-in replacement.
The sensor includes a bandgap temperature sensor and a 9-bit ADC, which together monitor and digitize the temperature to a resolution of up to 0.5 °C. The device operates over a wide temperature range of –55 °C to 125 °C, with an accuracy of ±3 °C over the full range and ±2 °C accuracy from –25 °C to +100 °C. It is factory-calibrated and requires no external components to measure temperature.
Key Specifications
| Parameter | Value |
|---|---|
| Temperature Measurement Range | –55 °C to 125 °C (–67 °F to +257 °F) |
| Accuracy | ±0.5 °C (typ), ±2 °C (max) from –25 °C to +100 °C, ±3 °C (max) over full range |
| Operating Voltage | 2.7 V to 5.5 V |
| Supply Current | 125 µA (typ) at 3.3 V |
| Conversion Time | 45 ms (typ) |
| Interface | 2-wire I2C/SMBus-compatible serial interface |
| Package | MSOP8 (TSSOP8) |
| Address Selection | Up to 8 devices on the same bus with selectable bus address |
Key Features
- Measures temperatures from –55 °C to +125 °C (–67 °F to +257 °F)
- High accuracy: ±0.5 °C (typ), ±2 °C (max) from –25 °C to +100 °C, ±3 °C (max) over full range
- Low operating current: 125 µA (typ)
- No external components required for temperature measurement
- 2-wire I2C/SMBus-compatible serial interface
- Selectable bus address allows connection of up to eight devices on the bus
- Wide power supply range: 2.7 V to 5.5 V
- Programmable temperature threshold and hysteresis set points
- Pin- and software-compatible with TCN75 (drop-in replacement)
- Power-up defaults permit standalone operation as a thermostat
- Shutdown mode to minimize power consumption
- Output pin (open drain) can be configured for interrupt or comparator/thermostat mode (dual-purpose event pin)
Applications
The STCN75DS2F is suitable for a variety of applications, including:
- Personal computers and system thermal management
- Electronics equipment and industrial controllers
- Thermostat and thermal watchdog functions
- General temperature monitoring in various industrial and consumer electronics
Q & A
- What is the temperature measurement range of the STCN75DS2F?
The STCN75DS2F measures temperatures from –55 °C to +125 °C (–67 °F to +257 °F).
- What is the accuracy of the STCN75DS2F?
The accuracy is ±0.5 °C (typ), ±2 °C (max) from –25 °C to +100 °C, and ±3 °C (max) over the full range.
- What is the operating voltage range of the STCN75DS2F?
The operating voltage range is from 2.7 V to 5.5 V.
- What is the typical supply current of the STCN75DS2F at 3.3 V?
The typical supply current is 125 µA at 3.3 V.
- What type of interface does the STCN75DS2F use?
The STCN75DS2F uses a 2-wire I2C/SMBus-compatible serial interface.
- How many devices can be connected on the same bus?
Up to eight devices can be connected on the same bus with selectable bus address.
- Does the STCN75DS2F require external components for temperature measurement?
No, the STCN75DS2F does not require external components for temperature measurement.
- What is the conversion time of the STCN75DS2F?
The conversion time is typically 45 ms.
- Can the STCN75DS2F be used as a thermostat?
Yes, the STCN75DS2F can operate as a thermostat with power-up defaults permitting standalone operation.
- What is the purpose of the output pin (OS/INT) on the STCN75DS2F?
The output pin (OS/INT) can be configured for interrupt or comparator/thermostat mode (dual-purpose event pin).
