PXD10 datasheet(75/130 Pages) FREESCALE

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Electrical characteristics

PXD10 Microcontroller Data Sheet, Rev. 1

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 27 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 10, 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 9. 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:

Table 27. 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

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