VREF

Table 1. Internal Voltage Reference Characteristics⁽¹⁾
Symbol	Description	Min.	Typ.	Max.	Unit
t_start	Start-up time	-	25	-	µs
V_DD	Power supply voltage range for 0V55	1.8	-	5.5	V
	Power supply voltage range for 1V1	1.8	-	5.5
	Power supply voltage range for 1V5	1.8	-	5.5
	Power supply voltage range for 2V5	3.0	-	5.5
	Power supply voltage range for 4V3	4.8	-	5.5

Note:

1.These parameters are for design guidance only and are not production tested.

Table 2. ADC Internal Voltage Reference Characteristics⁽¹⁾
Symbol⁽²⁾	Description	Condition	Min.	Typ.	Max.	Unit
1V1	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [0 - 105]°C	-2.0		2.0	%
0V55 1V5 2V5 4V3	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [0 - 105]°C	-3.0		3.0
0V55 1V1 1V5 2V5 4V3	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [-40 - 125]°C	-5.0		5.0

Notes:

1.These values are based on characterization and not covered by production test limits.
2.The symbols xVxx refer to the respective values of the ADC0REFSEL bit field in the VREF.CTRLA register.

Table 3. AC Internal Voltage Reference Characteristics⁽¹⁾
Symbol⁽²⁾	Description	Condition	Min.	Typ.	Max.	Unit
0V55 1V1 1V5 2V5	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [0 - 105]°C	-3.0		3.0	%
0V55 1V1 1V5 2V5 4V3	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [-40 - 125]°C	-5.0		5.0	%

Notes:

1.These values are based on characterization and not covered by production test limits.
2. The symbols xVxx refer to the respective values of the AC0REFSEL bit field in the VREF.CTRLA register.