User manual

Atmel SAM4E Xplained Pro [USER GUIDE]
42216A-MCU-01/2014
10
Pin number Name RGB interface
description
MCU interface
description
42 TWI SDA
I
2
C data line (maXTouch
®
)
43 TWI SCL I
2
C clock line (maXTouch)
44 IRQ1 maXTouch interrupt line
45 IRQ2 Interrupt line for other I
2
C devices
46 PWM Backlight control
47 RESET Reset for both display and maxTouch
48 VCC 3.3V power supply for extension board
49 VCC 3.3V power supply for extension board
50 GND Ground
3.4.3 Xplained Pro Power Header
The power header can be used to connect external power to the SAM4E Xplained Pro kit. The kit will
automatically detect and switch to the external power if supplied. The power header can also be used as supply
for external peripherals or extension boards. Care must be taken not to exceed the total current limitation
of the on-board regulator for the 3.3V regulated output. To locate the current measurement header, refer to
Figure 1-1, “SAM4E Xplained Pro Evaluation Kit Overview” on page 4
Table 3-6. Power header PWR
Pin number PWR header Pin name Description
1 VEXT_P5V0 External 5V input
2 GND Ground
3 VCC_P5V0 Unregulated 5V (output, derived
from one of the input sources)
4 VCC_P3V3 Regulated 3.3V (output, used as
main power for the kit)
Note
If the board is powered from a battery source it is recommended to use the PWR header. If there
is a power source connected to EDBG USB, the EDBG is activated and it will consume more
power.