MPC5606S datasheet(74/136 Pages) FREESCALE

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MPC5606S Microcontroller Data Sheet, Rev. 6

Freescale Semiconductor

The HPREG has a “soft startup” profile which increases the supply in steps of approximately 50 mV in a series of approximately

25 steps. Therefore, the peak current is within 750 mA of the maximum current during startup. This eliminates any noise on the

VDDR supply during startup and charging of NPN emitter stability capacitance of 40

F (minimum).

Soft startup also occurs when waking up from standby mode to limit noise on the VDDR supply.

In case VDDR is shared between the device and the ballast, it must be star routed on the board or isolated as much as possible

to avoid any noise injected by the ballast. Soft startup will help to limit this noise but a VDDR capacitor close to the ballast pin

is critical here. A minimum capacitance of 10

F is needed.

Table 29 shows the typical and maximum startup currents.

3.7.6

HPREG load regulation characteristics

The HPREG exhibits a very strong load-regulation behavior (the transition from low- to high-current state is regulated quickly).

This is illustrated in Figure 12, which shows a 10–150 mA jump over 10 ns. Under any case of load transition, the HPREG

responds within 100 ns and stabilizes within 5

s. This helps improve the stability of the 1.2 V supply and settling time.

Figure 11. HPREG load regulation

3.8

I/O pad electrical characteristics

3.8.1

I/O pad types

The device provides five main I/O pad types:

•

Slow pads — These are the most common pads, providing a good compromise between transition time and low

electromagnetic emission.

•

Medium pads — These are provided in two types (M1 and M2) and provide transitions fast enough for the serial

communication channels. M2 pads include slew rate control.

Table 29. Startup current

Symbol

Parameter

Value

Unit

Typ

Max

ISTART

T Startup current

300

800

1.2 V supply

Base control

3 V input supply

Load

MPC5606S Datasheet(PDF) 74 Page - Freescale Semiconductor, Inc

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