AT73C224-A_14 datasheet(11/75 Pages) ATMEL

Part #	AT73C224-A

Description	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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11

6266A–PMAAC–08-Sep-08

AT73C224

Figure 5-1 illustrates the complete automatic start-up sequence of the AT73C224-A and

AT73C224-F, whereas Figure 5-2 illustrates the automatic start-up sequence of the other

AT73C224-x device versions.

Figure 5-1.

Start up Sequence of the AT73C224-A and AT73C224-F

3ms

BOOST1

User Command:

. AT73C224-A: Through Dynamic mode (using TWI or SPI)

. AT73C224-F: Through Static mode (using D1 pin)

45ms typ

3ms

EN (Wake-up of the system)

(Pushbutton)

VINT

(internal supply)

PWRGDINT

(internal- Vth = 1.6V)

POK -> uP

(Start-up sequence

completed)

VMON

(internal Vth = 2.8V)

POR

(internal Vth = 1.6V)

VBAT

36 ms typ.

VBG

30 ms min

Automatic Start-up Sequence:

BUCK2

(Default value: 1.8V)

LDO4

(Default value: 2.8V)

LDO3

(Default value: 2.7V)

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AT73C224-A Datasheet(PDF) 11 Page - ATMEL Corporation

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