Safety mechanism detection device with temperature and voltage detection

Abstract

The safety mechanism detection device includes a temperature detection circuit and a voltage detection circuit. The temperature detection circuit detects a plurality of operating temperatures of the chip to generate a plurality of temperature values. The voltage detection circuit detects whether the power supply voltage used to drive the chip has been fully energized to generate a valid signal, detects a voltage under test in the chip to generate first and second voltage values, generates a plurality of voltage detection signals based on the first and second voltage values, and generates a voltage detection result based on the plurality of voltage detection signals when the valid signal is a predetermined value, indicating whether a voltage error has occurred in the chip. When the valid signal is a predetermined value, the plurality of temperature values ​​are used to generate a temperature detection result to determine whether a temperature error has occurred in the chip.

Claims

1. A safety mechanism detection device, comprising: a temperature detection circuit for detecting a plurality of operating temperatures of a chip to generate a plurality of temperature values; and a voltage detection circuit for detecting whether a power supply voltage for driving the chip has been fully energized to generate a valid signal, detecting a voltage under test in the chip to generate a first voltage value and a second voltage value, generating a plurality of voltage detection signals based on the first voltage value and the second voltage value, and generating a voltage detection result based on the plurality of voltage detection signals when the valid signal is a predetermined value, to indicate whether a voltage error has occurred in the chip; wherein when the valid signal is the predetermined value, the plurality of temperature values ​​are used to generate a temperature detection result to determine whether a temperature error has occurred in the chip.

2. The security mechanism detection device of claim 1, wherein the voltage detection circuit generates a first voltage detection signal among the plurality of voltage detection signals based on the first voltage value, generates a second voltage detection signal among the plurality of voltage detection signals based on the second voltage value, and generates a third voltage detection signal among the plurality of voltage detection signals based on a difference between the first voltage value and the second voltage value.

3. If the valid signal of the security mechanism detection device in request item 1 is not the predetermined value, the voltage detection result and the temperature detection result shall be deemed invalid.

4. The security mechanism detection device as described in claim 1, wherein the plurality of operating temperatures correspond to different locations on the chip.

5. The security mechanism detection device as claimed in claim 1, wherein the temperature detection circuit comprises: a first temperature sensor for detecting a first operating temperature among a plurality of operating temperatures of the chip to generate a first temperature value among a plurality of temperature values; a second temperature sensor for detecting a second operating temperature among the plurality of operating temperatures of the chip to generate a second temperature value among a plurality of temperature values; a subtractor circuit for determining a difference between the first temperature value and the second temperature value; a target register for storing a first temperature target value and a second temperature target value associated with the chip; a first absolute temperature detector for comparing the first temperature value and the first temperature target value to generate a first temperature detection signal; a second absolute temperature detector for comparing the second temperature value and the first temperature target value to generate a second temperature detection signal; and a relative temperature detector for comparing the difference with the second temperature target value to generate a third temperature detection signal; wherein, The temperature detection result is generated based on the first temperature detection signal, the second temperature detection signal, and the third temperature detection signal.

6. The security mechanism detection device of claim 1, wherein the voltage detection circuit comprises: a power-on detection circuit for detecting whether the power supply voltage has been fully energized to generate the valid signal; a first voltage sensor for detecting the voltage to be measured to generate the first voltage value; a second voltage sensor for detecting the voltage to be measured to generate the second voltage value; a subtractor circuit for determining a difference between the first voltage value and the second voltage value; a target register for storing a first voltage target value and a second voltage target value associated with the chip; a first absolute voltage detector for comparing the first voltage value and the first voltage target value to generate a first voltage detection signal from the plurality of voltage detection signals; and a second absolute voltage detector for comparing the second voltage value and the first voltage target value to generate a second voltage detection signal from the plurality of voltage detection signals. A relative voltage detector compares the difference with the second voltage target value to generate a third voltage detection signal; and an error detection circuit generates the voltage detection result based on the first voltage detection signal, the second voltage detection signal, and the third voltage detection signal.

7. The security mechanism detection device of claim 6 further includes: a logic control circuit that controls each of the first voltage sensor and the second voltage sensor to detect the voltage to be measured, controls the target register to output the first voltage target value to the first absolute voltage detector and the second absolute voltage detector, and outputs the second voltage target value to the relative voltage detector.

8. The safety mechanism detection device as described in claim 6, wherein the relative voltage detector is selectively activated based on a consistent energy signal.

9. The safety mechanism detection device of claim 1, wherein the temperature detection circuit generates a plurality of temperature voltage values ​​based on the plurality of temperature values, and the voltage detection circuit generates the temperature detection result based on the plurality of temperature voltage values.

10. The security mechanism detection device of claim 9, wherein the temperature detection circuit comprises: a first temperature sensor for detecting a first operating temperature among the plurality of operating temperatures of the chip to generate a first temperature value among the plurality of temperature values; a second temperature sensor for detecting a second operating temperature among the plurality of operating temperatures of the chip to generate a second temperature value among the plurality of temperature values; a first temperature-to-voltage conversion circuit for generating a first temperature voltage value among the plurality of temperature voltage values ​​based on the first temperature value; and a second temperature-to-voltage conversion circuit for generating a second temperature voltage value among the plurality of temperature voltage values ​​based on the second temperature value.

Images