AT73C224-F_14 Datasheet, PDF (12/75 Pages) ATMEL Corporation – Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

Figure 5-2.
Automatic Start-up Sequence of all Other Versions of the AT73C224-x Device Series
POK (Automatic Start-up
sequence completed)
V
BUCK2
(Default value: 1.2V)
LDO4
(Default value: 1.8V)
LDO3
(Default value: 1.8V)
BOOST1
User Command:
. AT73C224-B: Through Dynamic mode (using TWI or SPI)
AT73C224-B, AT73C224-G
3ms
3ms
3ms
BUCK2
(Default value: 1.8V)
LDO4
(Default value: 2.8V)
LDO3
(Default value: 2.7V)
BOOST1
User command:
. AT73C224-C: Through Dynamic mode (using TWI or SPI)
. AT73C224-G: Through Static mode (using D1 pin)
AT73C224-C, AT73C224-H
BUCK2
(Default value: 1.2V)
LDO4
(Default value: 1.8V)
LDO3
(Default value: 1.8V)
BOOST1
User Command:
. AT73C224-D: Through Dynamic mode (using TWI or SPI)
BUCK2
User command:
. AT73C224-E: Through Dynamic mode (using TWI or SPI)
. AT73C224-H: Through Static mode (using D2 pin)
LDO4
(Default value: 3.3V)
LDO3
(Default value: 3V)
BOOST1
(Default value: 5.2V)
12 AT73C224
AT73C224-D, AT73C224-I
AT73C224-E, AT73C224-J
6266A–PMAAC–08-Sep-08