ISL12024IRTCZ-T Intersil, ISL12024IRTCZ-T Datasheet - Page 23

• Manufacturer Part Number: ISL12024IRTCZ-T
• Description: IC RTC/CALENDER 64BIT 8-TDFN
• Manufacturer: Intersil
• Type: Clock/Calendar/EEPROMr

Specifications of ISL12024IRTCZ-T

• Memory Size: 4K (512 x 8)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Once the registers are set, the following waveform will be
seen at IRQ/F
Note that the status register AL0 bit will be set each time the
alarm is triggered, but does not need to be read or cleared.
I
Operation in Battery Backup Mode is affected by the BSW
and SBIB bits as described earlier. These bits allow flexible
operation of the serial bus and EEPROM in Battery Backup
Mode, but certain operational details need to be clear before
utilizing the different modes. Table 8 describes four different
modes possible with using the BSW and SBIB bits, and how
they affect the serial interface and battery backup operation.
• Mode A - In this mode, selection bits indicate a Standard
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2
B (X1226
C Communications During Battery Backup
Mode switchover combined with I
Backup Mode. When the V
lower of V
Backup Mode. If the microcontroller and bus pull-ups are
MODE
Mode)
C
D
A
RTC AND ALARM REGISTERS ARE BOTH 30s
TRIP
SBIB BIT
OUT
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0
0
1
1
or V
:
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
BAT
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BSW BIT
, then the device will enter Battery
60s
0
1
0
1
23
DD
voltage drops below the
2
V
V
Standard Mode,
Standard Mode,
C operation in Battery
SWITCHOVER
Legacy Mode,
Legacy Mode,
TRIP
TRIP
V
V
VOLTAGE
DD
DD
V
= 2.2V typ
= 2.2V typ
BAT
< V
< V
BAT
BAT
I
2
ISL12024IRTCZ
C ACTIVE IN
BACKUP?
BATTERY
Yes
Yes
NO
NO
TABLE 8.
WRITE/READ
IN BATTERY
BACKUP?
• Mode B - In this mode selection, bits indicate Legacy
• Mode C - This mode combines Standard Mode battery
• Mode D - This mode combines Legacy Mode battery
Note that the IRQ/F
battery backup for all modes, allowing clocking of devices
while in Battery Backup Mode. The pull-up on the pin will
need to go to V
increase accordingly.
EEPROM
also powered by the battery, then the ISL12024IRTCZ can
communicate in Battery Backup Mode.
Mode switchover combined with I
Backup Mode. When the V
the device will enter Battery Backup Mode. If the
microcontroller and bus pull-ups are also powered by the
battery, then the ISL12024IRTCZ can communicate in
Battery Backup Mode. This mode places the
ISL12024IRTCZ device in the same operating mode as
the X1226 legacy device.
switchover with no I
When the V
V
the I
drain.
switchover with no I
When the V
enter Battery Backup Mode and the I
disabled, minimizing V
NO
NO
NO
NO
BAT
2
, then the device will enter Battery Backup Mode and
C interface will be disabled, minimizing V
pull-up to V
pull-up to V
pull-up to V
pull-up to V
YES, needs
YES, needs
YES, needs
YES, needs
DD
DD
FREQ/IRQ
ACTIVE?
BAT
voltage drops below the lower of V
voltage drops below V
, and thus battery mode current draw will
OUT
2
2
BAT
BAT
BAT
BAT
C operation in Battery Backup Mode.
C operation in Battery Backup Mode.
open drain output pin is active in
BAT
V
V
V
V
needed on I
Battery Backup.
V
V
V
BAT
TRIP
BAT
BAT
BAT
TRIP
BAT
DD
current drain.
switchover at lower of V
. Pull-ups needed on I
to operate in Battery Backup.
switchover at <V
switchover at lower of V
.
switchover at <V
voltage drops below V
2
C operation in Battery
2
C to V
2
BAT
NOTES
C interface will be
, the device will
BAT
DD
DD
to operate in
BAT
. Pull-ups
.
August 8, 2008
2
TRIP
C to
current
BAT
BAT
FN6749.0
BAT
or
or
or
,