AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

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.

As soon as a conversion is requested thanks to the ADSC bit, the Analog to Digital Conversion

is started. In case the amplifier output is modified during the sample phase of the ADC, the on-

going conversion is aborted and restarted as soon as the output of the amplifier is stable. This

ensure a fast response time. The only precaution to take is to be sure that the trig signal (PSC)

frequency is lower than ADCclk/4.

Figure 21-16. Amplifier synchronization timing diagram for AT90PWM2B/3B

With change on analog input signal

Delta V

4th stable sample

Signal to be

measured

PSC

Block

PSCn_ASY

AMPLI_clk

(Sync Clock)

CK ADC

ADC

ADSC

ADC

Activity

ADC

Conv

ADC

Sampling

ADCResult

Ready

Valid sample

ADC

Conv

ADC

Sampling

ADCResult

Ready

4317K–AVR–03/2013

Figure 21-17. Amplifier synchronization timing diagram for AT90PWM2B/3B

ADSC is set when the amplifier output is changing due to the amplifier clock

switch.

254

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