MPC5644B datasheet(56/114 Pages) FREESCALE

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MPC5646C Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

EMI/decoupling cap (CREGP) at each VDD_LV/VSS_LV pin pair.

4.8.1.1

Recommendations

•

The external NPN driver must be BCP68 type.

•VDD_LV should be implemented as a power plane from the emitter of the ballast transistor.

•10

F capacitors should be connected to the 4 pins closest to the outside of the package and should be evenly

distributed around the package. For BGA packages, the balls should be used are D8, H14, R9, J3–one cap on each side

of package.

— There should be a track direct from the capacitor to this pin (pin also connects to VDD_LV plane). The tracks ESR

should be less than 100 m

.

— The remaining VDD_LV pins (exact number will vary with package) should be decoupled with 0.1 F caps,

connected to the pin as per 10

F.

(see Section 4.4, “Recommended operating conditions”).

4.8.2

VDD_BV options

•

Option 1: VDD_BV shared with VDD_HV_A

VDD_BV must be star routed from VDD_HV_A from the common source. This is to eliminate ballast noise injection on

the MCU.

•

Option 2: VDD_BV independent of the MCU supply

VDD_BV > 2.6 V for correct functionality. The device is not monitoring this supply hence the external component must

meet the 2.6 V criteria through external monitoring if required.

Table 22. Voltage regulator electrical characteristics

Symbol

Parameter

Conditions1

Value2

Unit

Min

Typ

Max

CREGn

SR — External ballast stability capacitance

—

F

RREG

SR — Stability capacitor equivalent serial

resistance

——

—

0.2



CREGP

SR — Decoupling capacitance (Close to

the pin)

VDD_HV_A/HV_B/VSS_HV

pair

100

—

VDD_LV/VSS_LV pair

100

—

CDEC2

SR — Stability capacitance regulator

supply (Close to the ballast collector)

VDD_HV_A/VSS_HV

—

F

VMREG

CC P Main regulator output voltage

Before trimming

—

1.32

—

After trimming

—

1.28

—

IMREG

SR — Main regulator current provided to

VDD_LV domain

——

—

350

IMREGINT

CC D Main regulator module current

consumption

IMREG = 200 mA

—

IMREG = 0 mA

—

VLPREG

CC P Low power regulator output voltage

After trimming

—

1.23

—

ILPREG

SR — Low power regulator current

provided to VDD_LV domain

—

——

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