59.2.7 Analog Reference, Analog Front-End and DAC
| Signal Name | Recommended Pin Connection | Description | |
|---|---|---|---|
| Analog Voltage References | |||
| VREFP | 2.0V to VDDIN LC Filter is required. | Positive reference voltage. VREFP is a pure analog input. VREFP is the voltage reference for the AFEC (ADC, PGA DAC and Analog Comparator). To reduce power consumption, if analog features are not used, connect VREFP to GND. Noise must be lower than 100 μVrms | |
| VREFN | Analog Negative Reference | AFE, DAC and Analog Comparator negative reference VREFN must be connected to GND or GNDANA. | |
| 12-bit Analog Front-End | |||
| AFEx_AD0–AFEx_AD11 | 0 to VREFP | AFE inputs channels All are pulled-up inputs (100 kΩ) to VDDIO at reset. | |
| AFEx_ADTRG | Application dependent. (Pulled-up on VREFP) | AFE external trigger input All are pulled-up inputs (100 kΩ) to VDDIO at reset. | |
| 12-bit Digital-to-Analog Converter | |||
| DAC0–DAC1 | Application dependent. 0 to VREFP | Analog output All are pulled-up inputs (100 kΩ) to VDDIO at reset. | |
| DATRG | Application dependent. | DAC external trigger input Pulled-up input (100 kΩ) to VDDIO at reset. | |
Note:
- AFE0_AD11 is not an actual pin but is connected to a temperature sensor.