QSEVEN-Q7ALx2 - Preliminary User Guide, Rev. 0.7
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5.8.4.
Input Power Sequencing
The following figure illustrates the Q7ALx2 module’s inputs power start and stop sequence requirements.
Figure 11: Input Power Start and Stop Sequence
VCC_RTC
VCC_SB
VCC
PWGIN
PWGIN is an active high input for the Qseven® module and indicate that the all the power
rails on the carrier board are ready for use.
Start sequence
VCC_RTC must come up at the same time or before VCC_SB comes up (T1)
VCC_SB must come up at the same time or before VCC comes up (T2)
PWGIN must be active at the same time or after VCC comes up (T3)
Stop Sequence
PWGIN must be inactive at the same time or before VCC goes down (T4)
VCC must go down at the same time or before VCC_SB goes down (T5)
VCC_SB must go down at the same time or before VCC_RTC goes down (T6)
5.8.5.
Power Management
Power management options are available within the BIOS setup. The Q7ALx2 implements the Advanced Configuration
and Power Interface (ACPI) ACPI 3.0 hardware specification to control typical features such as power button and
suspend states.
If power is removed, 5 VDC can be applied to VCC_SB pins (pins 205 and 206) to support the suspend-states:
Suspend-to-Disk (S4)
Soft-off state (S5)
Implementing the wake-up event (S0) requires a connection to power, as the module will be started.
