AT25DF161-SH ATMEL [ATMEL Corporation], AT25DF161-SH Datasheet - Page 9

• Manufacturer Part Number: AT25DF161-SH
• Description: 8-bit Atmel Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

5 Peripherals
5.1 Serial flash
5.2 Atmel AVR QTouch button
5.3 Battery backup system
8394B-AVR-02/12
The Atmel AVR XMEGA-A3BU Xplained has an external Atmel AVR AT45DB642D
DataFlash device mounted. A footprint is also available for adding an industrial
standard serial flash like the AT25 series from Atmel. Compatible serial flash devices
for both footprints are listed in
Table
The footprints share the same SPI lines including the chip select, and therefore it is
not possible to mount devices on both footprints at the same time.
Table 5-1. Serial flash connection.
Table 5-2. Compatible devices for the footprints.
The XMEGA-A3BU Xplained kit has one Atmel QTouch button and the connection to
the Atmel AVR XMEGA is shown in
located on the second layer of the board (same as GND layer). The sensor is
shielded by the third layer (VCC layer) and therefore the sensor is not affected by any
touches from the back side of the board.
Table 5-3. QTouch button connection.
The battery backup system backs up the RTC of the XMEGA. It consists of a coin cell
battery, a battery holder and a jumper that can be used to disconnect the battery from
the XMEGA. A manganese dioxide lithium battery (CR1220) from Panasonic with a
nominal voltage of 3V and nominal capacity of 35mAh is used in this design. In order
Pin on XMEGA
PD1
PD3
PD2
PF4
Atmel AVR AT45DB
AT45DB64D2-CNU (mounted)
AT45DB321D-MWU
AT45DB161D-SS
AT45DB081D-SS
AT45DB041D-SS
AT45DB021D-SS
AT45DB011D-SS
Pin on XMEGA
PF6
PF7
5-1.
Table 5-2
Serial flash
SCK
MOSI
MISO
SS
Atmel AVR AT25DF
AT25DF641A-SH
AT25DF321A-SH
AT25DF161-SH
AT25DF081-SSH
AT25DF021-SSH
QButton
SNS
SNSK
Table
and the connection to the MCU is shown in
5-3. The QTouch sensor, a copper fill, is
Atmel AVR1923
9