ATEVK527 Atmel, ATEVK527 Datasheet - Page 10

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ATEVK527

Manufacturer Part Number
ATEVK527
Description
KIT EVAL PWM AVR USB 4 SERIES
Manufacturer
Atmel
Series
AVR®r
Datasheet

Specifications of ATEVK527

Main Purpose
Power Management, Battery Charger
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
ATmega16U4, ATmega32U4
Primary Attributes
1 Cell- Li-Ion
Secondary Attributes
Graphical User Interface, USB Interface
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
3.6.1 PWM frequency
10
AVR146
The PWM speed for the PWM is programmed to the maximum (64MHz). The source
clock is the PLL output (96MHz) used both by USB and PWM.
A postscaler offers a 1.5 division for the PLL signal: 96MHz/1.5 = 64MHz (see
PLLTM1 and PLLTM0 in PLLFREQ register).
The result on the PWM output signal is a 250kHz frequency:
64MHz / 256 = 250kHz
Where 256 is the size in bit of the in OCR4A compare register used in Timer 4.
Figure 3-2. PWM output signal.
The software controls the battery voltage/current in modifying the duty cycle of PWM
output. If ton increases, the battery voltage/current receives a more important energy
load.
PWM
output
t
on
t
off
7801A-AVR-06/08
t

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