Rev 2.0
Page 142 of 164
Generic Qseven Carrier Board Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
3.2
Power Output to Qseven CPU Module
The Qseven Generic Carrier Board provides all the necessary power to Qseven CPU Modules as
mentioned in the Qseven Specification. Qseven CPU modules r5V (VCC) as a Main power input
and two optional power rails for +5V standby voltage & +3V RTC supply voltage.
Table 48: Power Output to Qseven CPU Modules
Sl. No.
Power Rail
Min (V)
Typical (V)
Max(V)
1
VCC
4.75V
5V
5.25V
2
VCC_5V_SB
4.75V
5V
5.25V
3
VCC_RTC
-
3V
-
The Qseven Generic Carrier Board Power Output sequencing to Qseven CPU modules are explained
below.
Figure 45: Power Sequence to Qseven CPU Module
Table 49: Power Sequence Timing to Qseven CPU Module
Item
Description
Value
Power Up
Sequence
T1
VCC_RTC rise time to VCC_5V_SB rise time
≥ 0 ms
T2
VCC_5V_SB rise time to VCC rise time
0 ms
T3
VCC rise time to PWGIN rise time
0 ms
Power Down
Sequence
T4
PWGIN fall time to VCC fall time
0 ms
T5
VCC fall time to VCC_5V_SB fall time
0 ms
T6
VCC_5V_SB fall time to VCC_RTC fall time
≥ 0 ms
Note: PWGIN is the Power Good output to Qseven CPU module. This pin is default pulled to VCC_5V_SB
power in Qseven Generic Carrier Board. Generic Carrier Board also optionally supports Power Good
circuit and default not populated.
