Power Supply; Measuring Sam4L Power Consumption; Standard Headers And Connectors; Xplained Pro Standard Extension Header - Atmel Xplained Pro SAM4L User Manual

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

Power supply

The SAM4L 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
er sources and specifications are listed in
Table 3.3. Power sources for SAM4L 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 SAM4L power consumption

As part of an evaluation of the SAM4L it can be of interest to measure its power consumption. Because the de-
vice has a separate power plane (VCC_MCU_P3V3) on this board it is possible to measure the current con-
sumption 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 ampere meter
it is possible to determine the current consumption. To locate the current measurement header, please refer to
Figure 1.1, "SAM4L Xplained Pro evaluation kit
Warning Do not power the board without having the jumper or an ampere meter mounted. This can cause
the SAM4L 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 contains 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
Table 3.3, "Power sources for SAM4L Xplained
Voltage requirements
5 V +/- 2 % (+/- 100 mV)
for USB host operation.
4.3 V to 5.5 V if USB
host operation is not re-
quired
4.4V to 5.25V (accord-
ing to USB spec)
4.4V to 5.25V (accord-
ing to USB spec)
overview.".
Example Content
3000
3600
30
"Power header" on page
Current requirements
Recommended mini-
mum is 1A to be able to
provide enough current
for connected USB de-
vices and the board it-
self.
Recommended maxi-
mum is 2A due to the in-
put protection maximum
current specification.
500 mA (according to
USB spec)
500 mA (according to
USB spec)
Atmel SAM4L Xplained Pro [USER GUIDE]
10. The available pow-
Pro".
Connector marking
PWR
DEBUG USB
TARGET USB
Table 3.4, "Stan-
8
42074A-MCU-02/13