AT90PWM2 datasheet(51/365 Pages) ATMEL

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4317K–AVR–03/2013

AT90PWM2/3/2B/3B

When the BOD is enabled (by programming the BODLEVEL [2..0] Fuse).

When the bandgap reference is connected to the Analog Comparator (by setting the

ACBG bit in ACSR).

When the ADC is enabled.

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

VBG

Bandgap reference voltage

1.1

tBG

Bandgap reference start-up time

µs

IBG

Bandgap reference current

consumption

µA

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