TEMPERATURE ESTIMATION CIRCUIT AND COUNT VALUE CORRECTION CIRCUIT

摘要

According to one embodiment, a temperature estimation circuit includes a first oscillator, a second oscillator, an enable period setting unit, a first counter, a first memory, a second memory, and an operation unit. The operation unit executes a computation to calculate an operation temperature based on an operation-time count value that is outputted from the first counter during a normal operation, the first count value, and the second count value.

主权项

1. A temperature estimation circuit comprising:
a first oscillator to generate a first oscillating signal having a smaller temperature-related change rate of an oscillating frequency than a predetermined value and having a small temperature-related change; a second oscillator to generate a second oscillating signal having an oscillating frequency linearly changing with respect to a temperature; an enable period setting unit to set a count period for a predetermined number of oscillations of the first oscillating signal as an enable period; a first counter to count the number of oscillations of the second oscillating signal during the enable period; a first memory to store therein a count output value outputted from the first counter when a test at a first temperature is performed, as a first count value; a second memory to store therein a count output value outputted from the first counter when a test at a second temperature is performed, as a second count value; and an operation unit to execute a computation to calculate an operation temperature based on an operation-time count value outputted from the first counter during a normal operation, the first count value, and the second count value.