REL 1.2
Page 67 of 82
i.MX6 Qseven PMIC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
3.1.2
Power Input Sequencing
i.MX6 Qseven PMIC SOM’s Power Input sequence requirement is explained below.
Power up Sequence:
VCC_RTC must come up at the same time or before VCC comes up.
PWGIN signal from Qseven Edge must be active at the same time or after VCC comes up.
Power down Sequence:
PWGIN signal from Qseven Edge must be inactive at the same time or before VCC goes down.
VCC must go down at the same time or before VCC_RTC goes down.
Figure 12: Qseven SOM Power Sequence
Table 16: Power Sequence Timing
Item
Description
Value
T1
VCC_RTC rise time to VCC rise time
≥ 0 ms
T2
VCC rise time to PWGIN rise time
≥ 0 ms
T3
PWGIN fall time to VCC fall time
≥ 0 ms
T4
VCC fall time to VCC_RTC fall time
≥ 0 ms
Important Note: All carrier board power supplies should be powered ON only after the SOM is powered ON
completely. This is to ensure that there is no back voltage (leakage) from any supply on the board towards the CPU
GPIO pins which may affect the booting.