ATEVK527 Atmel, ATEVK527 Datasheet - Page 2

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

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

2 Description
This document describes an application running on the EVK527 evaluation kit. The
EVK527 is dedicated to ATmega16/32U4.
The USB offers a 5V power supply on the VBUS pin. The available current range is
from 100mA to 500mA. This is enough to charge a Li-Ion battery cell.
A Li-Ion cell needs a precise control of voltage and current during charge.
ATmega16/32U4 offers a USB full speed interface, PWM channels and 10 bit-ADC
channels. All these features are used to perform a Li-Ion battery charger via USB.
Figure 2-1. Hardware Description.
EVK527
PC
USB Link
Battery
For a user friendly interface, all charging parameters (charging status, battery voltage,
charge current, battery temperature…) are displayed on the PC without the use of
measurement tools.
After the USB enumeration, a virtual communication port is declared (see Fig1.2). A
HyperTerminal window connected to this communication port displays charging
parameters. The communication port is virtual therefore HyperTerminal port settings
(speed, parity…) are not taken into account. The user can select the default
configuration.
AVR146
2
7801A-AVR-06/08