Rev 1.0
Page 65 of 69
Generic Q7 Carrier Card Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.23
Power Supply
The Q7 Generic Carrier Card has 12V power jack for external power supply input and uses on
board voltage regulators for internal power management.
Table 7: Power Sequence Table
Regulators
Voltage
Sequence
VCC_12V
12V
Always power
VCC_5VA
5V
Always power, generated from
VCC_12V
VCC_5V
5V
This rail enable after VCC_5VA reaches
power good
VCC_3V3A
3.3V
Always power, generated from
VCC_12V
VCC_3V3
3.3V
This rail enable after VCC_3V3A
reaches power good
VCC_1V8
1.8V
This rail enable after VCC_5V reaches
power good
VCC_2V8_CAM
2.8V
This rail enable after VCC_5V reaches
power good
2.23.1
Power Jack
A 2.5mm x 6.5mm barrel connector is used which should fit standard DC Plugs with an inner
dimension of 2.5mm and an outer dimension of 5.5mm, and it is placed on top of board. If an
alternate power supply is used (not the original, supplied power supply), it should supply no
more than 12V output. If a Power Supply is properly connected to the Q7 Generic Carrier Card,
and the four Red 5V, 5VA, 3V3A, 3V3 power LED indicator is not lit, it could mean that either
the fuse has been blown, or that the voltage output of the power supply is too high.
12V power from an external power supply is connected to the Q7 Generic Carrier Card at
connector J3. From the connector, the 12V supply is sent directly to a 5A over current
protection fuse (F1). Reverse polarity protection is provided using Schottky diode B560C-13-F
(D14) and for over voltage protection Zener diode DFLZ12-7 (D15) is used. The circuit is shown
below in Figure.
