AN4092 datasheet(6/38 Pages) STMICROELECTRONICS

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Power Management Controller (PMC)

AN4092

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Doc ID 023080 Rev 2

Power Management Controller (PMC)

The SPC564Axx / SPC563Mxx devices require three separate power supplies, nominally:

●

5V (VDDREG, VDDEHx, VDDA);

●

3.3V (VRC33, VDDEHx, VDDEx);

●

1.2V (VDD, VDDPLL);

In addition, an optional 0.95 - 1.2 / 2 - 5.5 V Vstby for the SRAM stand-by functionality may

be required(a).

Different modes of operations are possible:

●

Single 5V system power supply (SPC564Axx: QFP176 only, SPC563Mxx: QFP144

only)

●

Three external power supplies

●

5V and 3.3V provided externally (1.2 V internally controlled)

●

5V and 1.2V provided externally (3.3 V internally generated)

1.1

Single 5 V system power supply

The SPC564Axx in QFP176 and the SPC563Mxx in QFP144 devices can operate from a

single 5 volt system power supply. An on-chip regulator is provided for 3.3 volts, and an on-

chip regulator controller is provided for the 1.2 volt supply. The 1.2 volt controller requires an

external NPN ballast transistor and external bypassing for proper operation. This section

covers the requirements for the regulator controller and the bypass capacitors for the

device.

The Voltage Regulator Supply (VDDREG) is the 5V input to the internal 3.3V regulator and

the 1.2 regulator controller. This input can be tied to VSS to disable these feature. However

grounding VDDREG disables also the low voltage inhibit (LVI) circuit. Refer to Section 1.2:

External power supply configuration for more details.

The SPC564Axx in BGA324 and the SPC563Mxx in QFP176 devices instead cannot

operate from a single 5 volt system power supply. Most of the SPC564Axx EBI interface

pins (main difference between BGA324 and QFP176) can’t be powered with 5V, therefore

an additional external voltage supply (3.3 V) is needed. Similarly, SPC563Mxx QFP176

Nexus pins (ALT_MDOx, ALT_MSEOx, ALT_EVTI, ALT_EVTO and ALT_MCKO) must be

supplied with 3.3 V.

1.1.1

External power supply slew rate

Make sure that all power supply ramps are not too fast and in line to what is specified in the

device datasheet. Higher slew rates might cause false ESD trigger.

1.1.2

3.3 V power supply

The 3.3V regulator circuitry is completely contained within the device and it requires only the

5V input supply (VDDREG) and a bypass capacitor on the regulator output(s), VRC33. This

Refer to Section 1.6: Stand-by RAM functionality

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