Datasheet

51
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
1. When the BOD is enabled (by programming the BODLEVEL [2..0] Fuse).
2. When the bandgap reference is connected to the Analog Comparator (by setting the
ACBG bit in ACSR).
3. When the ADC is enabled.
4. When the DAC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC or the DAC,
the user must always allow the reference to start up before the output from the Analog Compar-
ator or ADC or DAC is used. To reduce power consumption in Power-down mode, the user can
avoid the three conditions above to ensure that the reference is turned off before entering
Power-down mode.
9.1.2 Voltage Reference Characteristics
Note: 1. Values are guidelines only.
Table 9-4. Internal Voltage Reference Characteristics
(1)
Symbol Parameter Condition Min. Typ. Max. Units
V
BG
Bandgap reference voltage 1.1 V
t
BG
Bandgap reference start-up time 40 µs
I
BG
Bandgap reference current
consumption
15 µA