900844 datasheet(82/118 Pages) FREESCALE

82 / 118 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

Figure 47. VSDIO Detailed Internal Block Diagram

MAIN FEATURES

• Uses 3.3 V as the main power supply

• 215 mA maximum continuous output current

• Optimized for a 2.2 µF external filter capacitor with a maximum of 10 m

Ω ESR

• Uses an internal pass FET on LDO mode, and external pass FET on Switch mode.

• The output is monitored for under-voltage and over-current conditions in LDO mode.

POWER SWITCHES

Freescale’s power management solution for the Ultra-mobile platform for Netbooks, Tablets and Slates, includes 1 dedicated

power switch, housed in the 900844 PMIC. Table 45 shows its power characteristics.

VPNL33 uses an internal switch and are supplied from the 3.3 V output voltage.

Table 44. VSDIO Control Register Structure and Bits Description

Name

Bits

Description

VSDIOCNT (ADDR 0x4D - R/W - Default Value: 0x64)

CTLVSDIO

2:0

VSDIO State Control

x0 = Reserved

x1 = Reserved

x2 = Reserved

x3 = Reserved

x4 = OFF

x5 = Low Power

x6 = Active

x7 = Active

AOACCTLVSDIO

5:3

VSDIO State Control during AOAC Exit (when Exit pin is EXITSTBY pin is asserted). These bits will be initialized

by the system SPI controller after power up.

X0 = Do not copy

x1 = Do not copy

x2 = Do not copy

x3 = Do not copy

x4 = OFF

x5 = Low Power

x6 = Active

x7 = Active

SELVSDIO

7:6

VSDIO output voltage selections:

X0 = 1.8 V

x1 = 3.3 V

x2 = Reserved

x3 = Reserved

Table 45. 900844 Power Switch Voltage Rail

Switch

Typ. Voltage

Max Current

Description

VPNL33

3.3 V

100 mA

Power Switch with integrated MOSFET and less than 1% voltage drop.

LDO/Switch

Controller

VOSDIO

Output Monitor

SPI

Interface

COSDIO

VOCCP

CTLVSDIO

AOACCTLVSDIO

VSDIOFAULT

VREF

Discharge

FBSDIO

V33

MSDIO

SDIOGT

SELVSDIO

CINSDIO

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