LC823450 datasheet(103/112 Pages) ONSEMI

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LC823450

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103

INTERNAL POWER DOMAIN CONTROL

This LSI has eight power isolated region of internal core

for leakage current reduction, these can be power supply

OFF separately. Power isolated region ISOLATED−X (X

means one of the eight region ISOLATED A to I.

ISOLATED F doesn’t exist) described in Figure 37. Power

ON / OFF for each power domain is controlled by the

appropriate bit of System Controller of power control

ProgrammersModel_SystemController for details.

Each power isolation region and its contents, the flag of

the corresponding power control register (LSISTBY) and

power control register (LSISTBY) is as follows.

Table 59.

Name

Content

LSISTBY

ISOCNT

ISOLATED−A

Audio Block

Bit0 STBYA

Bit0 ISOCNTA

ISOLATED−B

Internal SRAM(seg 3/4/5)

Bit0 STBYB

Bit0 ISOCNTB

ISOLATED−C

Internal SRAM(seg 6/7/8)

Bit0 STBYC

Bit0 ISOCNTC

ISOLATED−D

Internal SRAM(seg 9)

220KB LPDSP32 ROM

Bit0 STBYD

Bit0 ISOCNTD

ISOLATED−E

USB 2.0 Holt Controller

SRAM for USB

Bit0 STBYE

Bit0 ISOCNTE

ISOLATED−G

Cache for S−Flash I/F

Bit0 STBYG

Bit0 ISOCNTG

ISOLATED−H

SD Card I/F

Memory Stick I/F

Bit0 STBYH

Bit0 ISOCNTH

ISOLATED−I

Internal ROM 256KB

Bit0 STBYI

Bit0 ISOCNTI

POWER SUPPLY SEQUENCE

Background

The basic sequence of power on/off of power supply is the

following order.

(Simultaneous power on/off is acceptable)

• Power on Vdd*(Internal) → Vdd*(IO) → Vsig(Signal)

• Power off Vsig(Signal) → Vdd*(IO) → Vdd*(Internal)

Power on of Vdd*(IO) while Vdd *(Internal) are power

off might generate the glitch on IO signals and flow of

through current.

To avoid it, the sequence mentioned above is recommended

as the basic sequence.

Recommendation

Following sequence is recommended (Simultaneous

power on/off is acceptable).

• Power on 1 → 2 → Vsig(signal)

• Power off Vsig(signal) → 2 → 1

NOTE:

The sequence of

1(Internal) → 2(IO) causes LSI

hard reset and prevent from making IO glitch

3(RTC) has dedicated power supply and

sequence which is described on the following

section.

Power Supply Group

1. Internal core, analog power supply (1V power

supply)

Vdd1, VddXT1, AVddPLL1, AVddPLL2,

AVddUSBPHY1, DVddUSBPHY1

2. External IO power supply (3V power supply)

Vdd2, VddSD0, VddSD1, VddSD2, VddQSPI

AVddUSBPHY2, AVddADC, AVddPLL3

AVddDAMPL, AVddDAMPR

3. RTC power supply

VddRTC

(Dedicated power supply and sequence is dedicated

power on/off sequence is described in the following

sections)

RTC Terminal Control Sequence

A power supply sequence and other terminal control

sequence of RTC are described as follows.

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