900844 datasheet(69/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

VBG

VBG is a low drop-out (LDO) fully integrated regulator with a P-CH Pass FET. It is high performance, low noise, and high

PSRR, with a low quiescent current and fast transient response. VBG is actively discharged during shutdown.

VBG shares an input voltage pin (PVIN1P8) and a reference ground pin (GND1P8) with the VCCA regulator, yet each has

independent control. PVIN1P8 is supplied from the VDDQ voltage if VDDQ output is set to 1.8 V, otherwise connect to V21 when

VDDQ is set to 1.5 V.

Figure 34. VBG Detailed Internal Block Diagram

Main Features

• Uses VDDQ or V21 as the main power supply

•2.0 mA maximum continuous output current

• Optimized for a 1.0 µF external filter capacitor with a maximum of 10 m

Ω ESR

• Uses an internal pass FET

• The output for each LDO is monitored for over-current conditions and under-voltage events

VBG Status/Control Registers and Bits Description

Reference the register map for read/write conditions and default state for each of these registers.

VCCA

VCCA is a low drop-out (LDO) fully integrated regulator with a P-CH Pass FET. It is high performance, low noise, and high

PSRR, with a low quiescent current and fast transient response. VCCA is actively discharged during shutdown.

Table 31. VBG Control Register Structure and Bits Description

Name

Bits

Description

VLBGCNT (ADDR 0x3F - R/W - Default Value: 0 x24)

CTLVBG

2:0

VBG State Control

x0 = Reserved

x1 = Reserved

x2 = Reserved

x3 = Reserved

x4 = OFF

x5 = Low Power

x6 = Active

x7 = Active

AOACCTLVBG

5:3

VBG State Control during AOAC Exit (when the 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

Reserved

7:6

Reserved

Controller

VOBG

VDDQ

PVIN 1P8

VOUTBG

Output Monitor

IOBG

SPI

Interface

CIN1P8

COBG

VOBG

CTLVBG

AOACCTLVBG

VBGFAULT

VREF

GND1P8

Discharge

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