STW4510 datasheet(13/57 Pages) STMICROELECTRONICS

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STw4510

Functional description

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Functional description

3.1

Introduction

The STw4510 integrates supplies for the processor cores and associated peripherals

●

Two step down DC/DC converters

–

Vsdc1 (programmable start-up and 1.2V default value), programmable via I2C

interface, for the processor cores (

Table 18)

–

Vsdc2, 1.8 V, for the Input/Output supply of all the system devices and for all

peripherals which require 1.8 V supply (

Table 19)

●

Five low drop regulators for general purposes.

–

Four of them, Vana(i) (i=1 to 3) and Vdig can be used for critical features like PLL

or analog and digital processor peripherals. These low-drop regulator output

voltage values are programmable through Vdig_sel [n] and Vana(i)_sel[j] pads

connected to Vbat or to ground.

Table 5 shows the available output voltages. The

electrical characteristics are listed in

Table 20, Table 21 and Table 22.

–

The last one is Vmmc and can supply different feature and in particular SD/MMC

card. This regulator is completely controlled via the I2C interface.

Table 6 shows

the available output voltages. The electrical characteristics are indicated in

Table 21.

Table 5.

Low drop regulator output voltage programmable values

LDO

I (mA)

Output voltage values (V)

1.0

1.2

1.5

1.8

2.5

2.8

3.0

3.3

Vdig

250

X(1)

(100mA)

X means available output voltage value.

Vana1

150

Vana2

150

Vana3

150

Table 6.

Vmmc low drop regulator output voltage

LDO

I (mA)

Output voltage values (V)

1.8

2.5

2.85

3.0

Vmmc

150

X(1)

X means available output voltage value.

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