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STTS2002 数据表(PDF) 26 Page - STMicroelectronics |
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STTS2002 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 52 page ![]() Temperature sensor registers STTS2002 26/52 Doc ID 15389 Rev 5 4.4.1 Alarm window trip The device provides a comparison window with an upper temperature trip point in the alarm upper boundary register, and a lower trip point in the alarm lower boundary register. When enabled, the event output will be triggered whenever entering or exiting (crossing above or below) the alarm window. 4.4.2 Critical trip The device can be programmed in such a way that the event output is only triggered when the temperature exceeds the critical trip point. The critical temperature setting is programmed in the critical temperature register. When the temperature sensor reaches the critical temperature value in this register, the device is automatically placed in comparator mode, which means that the critical event output cannot be cleared by using software to set the clear event bit. Table 15. Temperature trip point register format P3 P2 P1 P0 Name Register description Width (bits) Type (R/W) Default state (POR) 0 0 1 0 UPPER Alarm temperature upper boundary 16 R/W 00 00 0 0 1 1 LOWER Alarm temperature lower boundary 16 R/W 00 00 0 1 0 0 CRITICAL Critical temperature 16 R/W 00 00 Table 16. Alarm temperature upper boundary register format Sign MSB LSB(1) Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit(2) 1 Bit(3) 0 000 Alarm window upper boundary temperature 00 1. Bit 2 is LSB for default 10-bit mode. 2. Depending on status of the resolution register, bit 1 may display 0.125 °C value. 3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value. Table 17. Alarm temperature lower boundary register format Sign MSB LSB(1) Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit(2) 1 Bit(3) 0 00 0 Alarm window lower boundary temperature 00 1. Bit 2 is LSB for default 10-bit mode. 2. Depending on status of the resolution register, bit 1 may display 0.125 °C value. 3. Depending on status of the resolution register, bit 0 may display 0.0625 °C value. |
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