ATEVK527 Atmel, ATEVK527 Datasheet - Page 8

• 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

3.3.3 Electrical pinout
3.4 VBUS Supply Voltage
8
AVR146
This application uses a particular type of lithium-ion batteries and all configurations
presented here are based on manufacturer’s data. Other lithium-ion batteries may
naturally be used but it is up to the user to look up battery data from manufacturer’s
data sheets and make sure necessary adjustments are made to firmware and
hardware.
The figure below illustrates connection pads of the lithium-ion batteries used in this
application.
Figure 3-2. Connection pads of a VARTA™ EasyPack cell.
The battery is connected to the battery charger as follows.
Table 3-3. Connecting battery to charger
USB powered applications fall into one of the three following categories:
• Low-Power Bus The low power bus powered functions derive all their power from
• High-Power Bus The high power bus powered functions derive all their power
Battery Connector
- (minus)
NTC
ID
+ (plus)
VBUS and must not draw more than 1 unit load (100mA) according to the USB
standard. It must also be able to work between the VBUS voltage of 4.40V and
5.25V.
from VBUS and cannot draw more than 100mA until it has been configured. Once
configured, it can draw up to 5 unit loads (500mA) by requesting it in its descriptor.
At full load, it must be able to work between the VBUS voltage of 4.75V and
5.25V.
Charger Connector
BATTERY-
NTC/RID
SCL
BATTERY+
Note
Battery temperature measurement
RID, Battery identification resistor
7801A-AVR-06/08