AT90PWM2 datasheet(252/361 Pages) ATMEL

252 / 361 page

252

4317J–AVR–08/10

AT90PWM2/3/2B/3B

Until the conversion is not achieved, it is not possible to start a conversion on another channel.

In order to have a better understanding of the functioning of the amplifier synchronization, a tim-

ing diagram example is shown Figure 21-15 for AT90PWM2/3.

Figure 21-15. Amplifier synchronization timing diagram for AT90PWM2/3.

It is also possible to auto trigger conversion on the amplified channel. In this case, the conver-

sion is started at the next amplifier clock event following the last auto trigger event selected

thanks to the ADTS bits in the ADCSRB register. In auto trigger conversion, the free running

mode is not possible unless the ADSC bit in ADCSRA is set by soft after each conversion.

Only PSC sources can auto trigger the amplified conversion. In this case, the core must have a

clock synchronous with the PSC. If the PSC uses the PLL clock, the core must use the PLL/4

clock source.

AT90PWM2B/3B:

On PWM2B/3B, the amplifier has been improved in order to speed-up the conversion time.The

proposed improvement takes advantage of the amplifier characteristics to ensure a conversion

in less time.

In order to have a better understanding of the functioning of the amplifier synchronization, a tim-

ing diagram example is shown Figure for AT90PWM2B/3B.

Valid sample

Delta V

4th stable sample

Signal to be

measured

AMPLI_clk

(Sync Clock)

CK ADC

Amplifier Sample

Enable

Amplifier Hold

Value

PSCn_ASY

PSC

Block

Amplifier

Block

ADASCR

ADSC

ADC

ADC Result Ready

ADC

Sampling

AT90PWM2 Datasheet(PDF) 252 Page - ATMEL Corporation

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