REF: BBONEBLK_SRM
BeagleBone Black System
Reference Manual
Rev A5.2
Page 41 of 108
6.1.7
Power Consumption
The power consumption of the board varies based on power scenarios and the board boot
processes. Measurements were taken with the board in the following configuration:
DC powered and USB powered
HDMI monitor connected
USB HUB
4GB Thumbdrive
Ethernet connected @ 100M
Serial debug cable connected
Table 4
is an analysis of the power consumption of the board in these various scenarios.
Table 4.
BeagleBone Black Power Consumption(mA@5V)
MODE
USB
DC
DC+USB
Reset
TBD
TBD
TBD
Idling @ UBoot
210
210
210
Kernel Booting (Peak)
460
460
460
Kernel Idling
350
350
350
Kernel Idling Display Blank
280
280
280
Loading a Webpage
430
430
430
The current will fluctuate as various activates occur, such as the LEDs on and
uSD/eMMC accesses.
6.1.8
Processor Interfaces
The processor interacts with the
TPS65217C
via several different signals. Each of these
signals is described below.
6.1.8.1
I2C0
I2C0 is the control interface between the processor and the
TPS65217C
. It allows the
processor to control the registers inside the
TPS65217C
for such things as voltage
scaling and switching of the input rails.
6.1.8.2
PMC_POWR_EN
On power up the
VDD_RTC
rail activates first. After the RTC circuitry in the processor
has activated it instructs the
TPS65217C
to initiate a full power up cycle by activating
the
PMIC_POWR_EN
signal by taking it HI. When powering down, the processor can
take this pin low to start the power down process.
