Power Supply; Measuring Sam4E Power Consumption; Standard Headers And Connectors; Xplained Pro Standard Extension Header - Atmel SAM4E Xplained Pro User Manual

Data Field
Minimum Voltage [mV]
Maximum Voltage [mV]
Maximum Current [mA]
3.3

Power Supply

The SAM4E Xplained Pro kit can be powered either by USB or by an external power source through the 4-
pin power header, marked PWR. This connector is described in
The available power sources and specifications are listed in
Pro" on page 7.
Table 3-3. Power Sources for SAM4E Xplained Pro
Power input
External power
Embedded debugger
USB
Target USB
The kit will automatically detect which power sources are available and choose which one to use according to
the following priority:
1. External power
2. Embedded debugger USB
3. Target USB
Note
External power is required when the 500mA through the USB connector is not enough to power a
connected USB device in a USB host application.
3.3.1

Measuring SAM4E Power Consumption

As part of an evaluation of the SAM4E it can be of interest to measure its power consumption. Because the
device has a separate power plane (VCC_MCU_P3V3) on this board it is possible to measure the current
consumption by measuring the current that is flowing into this plane. The VCC_MCU_P3V3 plane is connected
via a jumper to the main power plane (VCC_TARGET_P3V3) and by replacing the jumper with an ammeter it is
possible to determine the current consumption. To locate the current measurement header, refer to
"SAM4E Xplained Pro Evaluation Kit Overview" on page
Warning Do not power the board without having the jumper or an ampere meter mounted. This can cause
the SAM4E to be powered through its I/O pins and cause undefined operation of the device.
3.4

Standard Headers and Connectors

3.4.1

Xplained Pro Standard Extension Header

All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension headers. Xplained Pro MCU boards
have male headers while Xplained Pro extensions have their female counterparts. Note that all pins are not
always connected. However, all the connected pins follow the defined pin-out described in
Data Type
uint16_t
uint16_t
uint16_t
Voltage requirements
5V ± 2 % (± 100mV) for
USB host operation.
4.3V to 5.5V if USB host
operation is not required
4.4V to 5.25V
(according to USB spec)
4.4V to 5.25V
(according to USB spec)
Example Content
3000
3600
30
"Xplained Pro Power Header" on page
Table 3-3, "Power Sources for SAM4E Xplained
Current requirements
Recommended
minimum is 1A to
be able to provide
enough current for
connected USB
devices and the board
itself. Recommended
maximum is 2A due
to the input protection
maximum current
specification.
500mA (according to
USB spec)
500mA (according to
USB spec)
4.
Atmel SAM4E Xplained Pro [USER GUIDE]
10.
Connector marking
PWR
DEBUG USB
TARGET USB
Figure 1-1,
Table 3-4, "Xplained
7
42216A-MCU-01/2014