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:
  1. AFE0_AD11 is not an actual pin but is connected to a temperature sensor.