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Please consider that power consumption is strongly dependent on the board's configuration, on number of processor cores active and from the interfaces that are
SW enabled. PCI-express and SATA interface are particularly significant for power consumption, so it is strongly recommended to disable them (via SW) if they are
not used.
2.3.2
Power Rails meanings
In all the tables contained in this manual, Power rails are named with the following meaning:
_S: Switched voltages, i.e. power rails that are active only when the board is in ACPI's S0 (Working) state. Examples: +3.3V_S, +5V_S.
_A: Always-on voltages, i.e. power rails that are active both in ACPI's S0 (Working), S3 (Standby) and S5 (Soft Off) state. Examples: +5V_A, +3.3V_A.
Other suffixes are used for application specific power rails, which are usually derived from same value of voltage, switched rails (for example, +3.3V_CAM is
derived from +3.3V_S, and so on).
2.3.3
Inrush current
In the following pictures are shown the inrush current relative to the total current drawn by Q7-928 module (with the only exception of the battery absorbed by the
battery, drawn from VCC_RTC pin).
Measurements have been made on all modules of Qseven i.MX6 family, no significant differences exist between various modules. For this reason, only graphs
related to i.MX6 Solo equipped with 512MB of DRAM and i.MX6 Quad with 4GB of DRAM are shown.
Current measurements are made using a Current Probe Chauvin Arnoux E3N 10-100A/V and an Oscilloscope Tektronix TDS2022C
I
current drawn from +5V_S power rail on MXM connector
VCC
I
current drawn from +5V_A power rail on MXM connector
SB
Fig. 1
I
+ I
Current consumption i.MX6 Solo 512MB DDR3
VCC
VSB
Q7-928
Q7-928 User Manual - Rev. First Edition: 1.0 - Last Edition: 3.0 - Author: S.B. - Reviewed by P.Z Copyright © 2016 SECO S.r.l.
Fig. 2
I
Current consumption i.MX6 Solo 512MB DDR3
VCC
16
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