MPC5645S datasheet(68/146 Pages) FREESCALE

68 / 146 page

Qorivva MPC5645S Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

4.6

EMI (electromagnetic interference) characteristics

4.7

Power management

4.7.1

Voltage regulator electrical characteristics

The internal voltage regulator requires an external NPN (BCP68 or NJD2873) ballast to be connected as shown in Figure 6 as

well as an external capacitance (CREG) to be connected to the device in order to provide a stable low voltage digital supply to

the device. Capacitances should be placed on the board as near as possible to the associated pins. Care should also be taken to

limit the serial inductance of the board to less than 15 nH.

For the MPC5645S microcontroller, 100 nF should be placed between each VDD12/VSS12 supply pair and also between the

VDDPLL/VSSPLL pair. Additionally, 10 F should be placed between the VDDR pin and the adjacent VSS pin.

VDDR = 3.0 V to 3.6 V / 4.5 V to 5.5 V, TA = -40 to 105 °C, unless otherwise specified.

Table 16. EMI testing specifications12

1 The reported emission level is the value of the maximum emission, rounded up to the next whole number.

2 IEC Level Maximum:, L is less than or equal to 24 dBµV, K is less than or equal to 30 dBµV.

Symbol

Parameter

Conditions

Clocks

Frequency

Range

Level

(Typ)

Unit

Radiated

Emissions

VEME

Device Configuration,

test conditions and EM

testing per standard

IEC61967-2

FOSC – 8MHz, External

Crystal

FCPU – 124MHz

FBUS – 124MHz

No PLL Frequency

Modulation

150 kHz – 50

MHz

dBµV

50 MHz –

150 MHz

150 MHz –

500 MHz

500 MHz –

1000 MHz

IEC Level

—

FOSC - 8MHz, External

Crystal

FCPU -124MHz

FBUS -124MHz

2% PLL Frequency

Modulation

150 kHz – 50

MHz

dBµV

50 MHz –

150 MHz

150 MHz –

500 MHz

500 MHz –

1000 MHz

IEC Level

—

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