STCN75_08 Datasheet, PDF (7/35 Pages) STMicroelectronics – Digital temperature sensor and thermal watchdog

STCN75
Description
1.2
Note:
Temperature sensor output
The STCN75 Temperature Sensor has a dedicated open drain over-limit signal/interrupt
(OS/INT) 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
● Section 2.4: Interrupt mode.
At power-up the STCN75 immediately begins measuring the temperature and converting
the temperature to a digital value.
The measured temperature value is compared with a temperature limit (which is stored in
the 16-bit (T_OS) READ/WRITE register), and the hysteresis temperature (which is stored in
the 16-bit (T_HYS) READ/WRITE register). If the measured value exceeds these limits, the
OS/INT pin is activated (see Figure 3 on page 8).
See Pin descriptions on page 8 for details.
Figure 1. Logic diagram
VDD
SDA⁽¹⁾
SCL
A0
A1
A2
STCN75
OS/INT⁽¹⁾
GND
AI11899
1. SDA and OS/INT are open drain.
Table 1. Signal names
Pin
Sym
Type/direction
1
SDA⁽¹⁾
Input/ Output
2
SCL
3
OS/INT⁽¹⁾
Input
Output
4
GND
Supply Ground
5
A₂
Input
6
A₁
Input
7
A₀
Input
8
V_DD
Supply power
1. SDA and OS/INT are open drain.
Description
Serial data input/output
Serial clock input
Over-limit signal/interrupt alert output
Ground
Address2 Input
Address1 Input
Address0 Input
Supply voltage (2.7 V to 5.5 V)
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