Table 4-4 GPIO Header
Pin on EXT connector
Silk screen marking
5
GPIO1
6
GPIO2
4.2.4.
UART Header
I/O1 Xplained Pro features a 2-pin header with access to the UART pins of the 20-pin extension
connector. This two pin header comes with a jumper mounted to enable the UART to work in loopback
mode. Both UART lines are terminated with 39Ω series resistors.
Table 4-5 UART Header
Pin on EXT connector
Silk screen marking
14
TX
13
RX
4.3.
Peripherals
4.3.1.
LED
There is one yellow LED available on the I/O1 Xplained Pro extension board that can be controlled by
Pulse Width Modulation (PWM) or regular GPIO operation. The LED can be activated by driving the
connected I/O line to GND.
Table 4-6 LED Connection
Pin on EXT connector
Silk screen marking
7
LED
4.3.2.
Low Pass Filter
I/O1 Xplained Pro features a first order low-pass filter with a cutoff frequency of ~2340Hz. It is realized
with a 680Ω resistor and a 100nF capacitor. This filter can be used to filter a PWM generated signal which
can be sampled with an ADC pin.
Table 4-7 Low Pass Filter Connections
Pin on EXT connector
Silk screen marking
8
PWM
4
ADC
4.3.3.
Temperature Sensor
I/O1 Xplained Pro extension board features an Atmel AT30TSE758 temperature sensor chip with an 8kb
serial EEPROM inside. The sensor includes programmable high and low temperature alarms, user-
selectable temperature resolution up to 12 bits, and an I
2
C/SMBus
™
compatible serial interface.
Atmel I/O1 Xplained Pro [USER GUIDE]
Atmel-42078B-IO1-Xplained-Pro_User Guide-10/2015
9
