ATtiny202/204/402/404/406

33.14 VREF

Table 33-20. Internal Voltage Reference Characteristics
Symbol	Description	Min.	Typ.	Max.	Unit
T_Start	Start-up time	-	25	-	µs
V_DDINT055V	Power supply voltage range for INT055V	1.8	-	5.5	V
V_DDINT11V	Power supply voltage range for INT11V	1.8	-	5.5
V_DDINT15V	Power supply voltage range for INT15V	1.9	-	5.5
V_DDINT25V	Power supply voltage range for INT25V	2.9	-	5.5
V_DDINT43V	Power supply voltage range for INT43V	4.75	-	5.5

Table 33-21. ADC Internal Voltage Reference Characteristics⁽¹⁾
Symbol⁽²⁾	Description	Condition	Min.	Typ.	Max.	Unit
INT11V	Internal reference voltage	V_DD = [1.8V, 3.6V] T = [0, 105]°C	-2.0		2.0	%
INT055V INT15V INT25V	Internal reference voltage	V_DD = [1.8V, 3.6V] T = [0, 105]°C	-3.0		3.0
INT055V INT11V INT15V INT25V INT43V	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [-40, 125]°C	-5.0		5.0

Note:

These values are based on characterization and not covered by production test limits.
The symbols INTxxV refer to the respective values of the ADC0REFSEL and DAC0REFSEL bit fields in the VREF.CTRLA register.

Table 33-22. AC Internal Voltage Reference Characteristics⁽¹⁾
Symbol⁽²⁾	Description	Condition	Min.	Typ.	Max.	Unit
INT055V INT11V INT15V INT25V	Internal reference voltage	V_DD = [1.8V, 3.6V] T = [0, 105]°C	-3.0		3.0	%
INT055V INT11V INT15V INT25V INT43V	Internal reference voltage	V_DD = [1.8V, 5.5V] T = [-40, 125]°C	-5.0		5.0	%

Note:

These values are based on characterization and not covered by production test limits.
The symbols INTxxV refer to the respective values of the ADC0REFSEL and DAC0REFSEL bit fields in the VREF.CTRLA register.

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