Design Checklist for PowerQUICC II Pro MPC8313E Processor
Design Checklist for PowerQUICC II Pro MPC8313E Processor
Design Checklist for PowerQUICC II Pro MPC8313E Processor
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Functional Blocks<br />
6.10 PMC<br />
The core power (V DD ) can be switched off as part of power management. The simple connection diagram<br />
shows how the external signals of <strong>MPC8313E</strong> help to implement the feature. However, a partial core<br />
(V DDC) is always provided with power and should not be switched off.<br />
This figure illustrates using FET to switch of V DD .<br />
Regulator<br />
Figure 13. Switching off V DD Using FET<br />
This figure illustrates using a regulator to switch off V DD .<br />
V DDC/AV DD2<br />
1 V<br />
V DDC /AV DD2<br />
Regulator<br />
1 V<br />
Keep the following points in mind:<br />
EXT_PWR_CTRL V DD AV DD1<br />
<strong>MPC8313E</strong><br />
<strong>MPC8313E</strong><br />
Regulator<br />
EXT_PWR_CTRL<br />
Figure 14. Switching off V DD using a Regulator<br />
• Only core PLL (AV DD1 ) can be switched off. Do not switch off the power to system PLL at any<br />
time.<br />
• When two regulators are used to generate V DD and V DDC individually, make sure the voltage<br />
difference between the two are within the limits described in the hardware specs.<br />
• Recommended devices <strong>for</strong> switchable V DD supply are as follows:<br />
— FET: TPC6004 from Toshiba (Use low RDS devices)<br />
— Regulator: MAX1510ETB + from Maxim<br />
<strong>Design</strong> <strong>Checklist</strong> <strong>for</strong> <strong>PowerQUICC</strong> <strong>II</strong> <strong>Pro</strong> <strong>MPC8313E</strong> <strong>Pro</strong>cessor, Rev. 3<br />
32 Freescale Semiconductor<br />
1 V<br />
PMC_PWR_OK<br />
V DD<br />
Filter<br />
Filter<br />
AV DD1
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