LC823450 datasheet(105/112 Pages) ONSEMI

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LC823450

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105

KeyInt RTC Mode (RTCMODE = 0)

By the master command from Cortex−M3, internal

sequencer of RTC controls BACKUPB signal for isolation

and power off. KEYINT input or internal RTCINT signal

can generate power on sequence. Power off sequence using

BACKUPB is also available for activation of power off by

external source.

it is necessary to detect the drop of the voltage of VDDRTC

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

stops).

Figure 58.

NOP

PWRON

(RTCINT − HiZ)

Wait for

Power ON

Wait for

KEYINT or

Int ernal RTCINT

PWROFF

(RTCINT = L)

ISOLATOR off

ISOLATOR

INIT

Wait for

Xt al

oscillat ion

Release Cort ex−M3 Core0 reset

Wait for RTC mast er command

RTCMASTER

VDET

Sequencer runs on XIN32K

and makes st at e t ransit ion

VDET

RTCINT

(PWRON)

ISOLATOR control

(Internal)

XIN32K

Any St at e

XIN32K

BACKUPB

STATE (Internal)

STATE

(Internal)

32 kH clk to

(Int ernal)

ISOLATOR control

(Internal 1: off 0: on)

RESET to VDD1 Power Area

(internal 1: release, 0: reset)

RESET to VDD1 Power Area

(internal 1: release, 0: reset)

VDD1 Power Area

32 kH clk to

VDD1 Power Area

(Internal 1: off 0: on)

VDD1

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