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STDS75DS2F Arkusz danych(PDF) 6 Page - STMicroelectronics |
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STDS75DS2F Arkusz danych(HTML) 6 Page - STMicroelectronics |
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6 / 37 page  Description STDS75 6/37 1 Description The STDS75 is a high-precision CMOS (digital) temperature sensor IC with a delta-sigma analog-to-digital (ADC) converter and an I2C-compatible serial digital interface (see Figure 1 on page 7). It is targeted for general applications such as personal computers, system thermal management, electronics equipment, and industrial controllers, and is packaged in the industry standard 8-lead TSSOP and SO8 packages (see Figure 2 on page 8). The device contains a band gap temperature sensor and programmable 9-to 12-bit ADC which monitor and digitize the temperature to a resolution up to 0.0625°C. The STDS75 is typically accurate to (±3°C - max) over the full temperature measurement range of –55°C to 125°C with ±2°C accuracy in the –25°C to +100°C range. At power-up, the STDS75 defaults to 9-bit resolution for software compatibility with the STLM75. STDS75 is specified for operating at supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the supply current is typically (125 µA). The on-board delta sigma analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrated in °C; for Fahrenheit applications a lookup table or conversion routine is required. The STDS75 is factory-calibrated and requires no external components to measure temperature. 1.1 Serial communications The STDS75 has a simple 2-wire I2C-compatible digital serial interface which allows the user to access the data in the temperature register at any time. It communicates via the serial interface with a master controller which operates at speeds up to 400kHz. Three pins (A0, A1, and A2) are available for address selection, and enable the user to connect up to 8 devices on the same bus without address conflict. In addition, the serial interface gives the user easy access to all STDS75 registers to customize operation of the device. 1.2 Temperature sensor output The STDS75 temperature sensor has a dedicated open drain over-limit signal/alert (OS/INT/Alert) output which features a thermal alarm function. This function provides a user-programmable trip and turn-off temperature. It can operate in either of two selectable modes: ● Comparator mode, and ● Interrupt mode. At power-up the STDS75 comes up in 9-bit mode and immediately begins measuring the temperature and converting the temperature to a digital value. The resolution of the digital output data is user-configurable to 9, 10, 11, or 12 bits which correspond to temperature increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively. |
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