2.1.18.3 Temperature Monitor

For the Temperature Monitor, the analog‑to‑digital converter (ADC) result represents temperature in degrees Kelvin (K).

When using the internal reference voltage (VREF = 2.56 V) and a 10‑bit resolution, each least significant bit (LSB) of the ADC result corresponds to 1 K. This relationship generalizes for the internal VREF as follows:

• 8‑bit mode: 1 LSB = 4 K
• 10‑bit mode: 1 LSB = 1 K
• 12‑bit mode: 1 LSB = 0.25 K

Examples

• 8‑bit mode:

  ADC value = 01001010b (74)

  Temperature = 74 * 4 = 296 K

• 10‑bit mode:

  ADC value = 0100101010b (298)

  Temperature = 298 * 1 = 298 K

• 12‑bit mode:

  ADC value = 000100101010b (298)

  Temperature = 298 * 0.25 = 74.5 K

Temperature Conversion Constant

The temperature conversion constant is defined as:

K = 2.30358 * 0.0000087248

These constants are derived from the diode equation.

Threshold Calculation

The calculated threshold for the Temperature Monitor is determined using the following equation:

Calculated Threshold = User Threshold(K)* K * Gain

where:

• User Threshold (K): Is the temperature threshold specified by the user.
• K : Is the temperature conversion constant.
• Gain: Is the gain applied by the Temperature Monitor (Gain = 12.5).