STTS75M2F datasheet(6/39 Pages) STMICROELECTRONICS

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Description

STTS75

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Description

The STTS75 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 STTS75 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 STTS75 defaults

to 9-bit resolution for software compatibility with the STLM75.

STTS75 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 (75 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 STTS75 is factory-calibrated and requires no external components to measure

temperature.

1.1

Serial communications

The STTS75 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 400 kHz. 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 STTS75 registers to

customize operation of the device.

1.2

Temperature sensor output

The STTS75 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:

●

Section 2.3: Comparator mode, and

●

Section 2.4: Interrupt mode.

At power-up the STTS75 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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