50.7.16 Temperature Sensor Characteristics
The temperature sensor provides an output voltage (VTEMP) that is proportional to absolute temperature (PTAT). This voltage can be measured through the channel number 7 of the 12-bit ADC. Improvement of the raw performance of the temperature sensor acquisition can be achieved by performing a single temperature point calibration to remove the initial inaccuracies (VTEMP and ADC offsets).
| Symbol | Parameter | Conditions | Min | Max | Unit |
|---|---|---|---|---|---|
| VDD3V3 | Supply voltage range (VDD3V3) | – | 2.5 | 3.6 | V |
| VVREFTEMP | Bandgap output voltage | TA = 25° C | 1.19 | 1.21 | V |
| dVVREFTEMP | Bandgap output voltage drift with temperature(3) | dVVREFTEMP =
VREFTEMP(TA) - VVREFTEMP Over TA range [-40°C to +85°C] | -25 | +25 | mV |
| VTEMP | Output voltage | TA = 25° C | 0.585 | 0.665 | V |
| tS | VTEMP settling time | When VTEMP is sampled by the 12-bit ADC, the required track time to ensure 1°C accurate settling | – | 10 | μs |
| TACC | Temperature reading accuracy(1, 2, 3) | After offset calibration
Over TA range [-40°C to +85°C] | -5 | +5 | °C |
| After offset calibration
Over TA range [-20°C to +70°C] | -4 | +4 | °C | ||
| tON | Start-up time(3) | – | – | 12 | μs |
Note:
- Does not include errors due to A/D conversion process.
- Using the output voltage sensitivity to temperature dVTEMP/dT = 2.07 mV / °C.
- Simulation data.