LC823450 datasheet(104/112 Pages) ONSEMI

Part #	LC823450

Description	Low Power & High-Resolution Audio Processing System LSI

PDF	112 Pages

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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LC823450

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104

General RTC Mode (RTCMODE = 1)

When only RTC operates, it is necessary to detect the drop

of the voltage of Vdd1 and Vdd2 power supply, and set

BACKUPB to Low which isolates VddRTC Domain from

Vdd1 Domain.

Moreover, it is necessary to detect the drop of the voltage

of VddRTC power supply, and set VDET to Low. (The RTC

operation stops).

Figure 56.

BACKUPB

0.2

× VDDRTC

VDDRTC

Min 0 ns

0.2

× VDDRTC

VDET

VDDRTC

VDD1

XIN32K

…

0.7

× VDDRTC

0.2

× VDDRTC

NRES

0.25

× VDD2

VDD2

2.7 V

Min 0 ns

1 & 2 is a reset condition of the

internal logic circuit.

Please refer to a chapter of Power

supply sequence during the

period when you should meet

these 2 conditions.

0.93 V

Min 0 ns

102.

Internal control logic for isolation.

Figure 57.

103.

VDD1 can be shut down while BACKUPB = Low

BACKUPB

ALL OUTPUT

ALL INPUT

ALL OUTPUT

VDD1 Domain

VDDRTC Domain

LC823450 Datasheet(PDF) 104 Page - ON Semiconductor

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