ISL12026IBZ Intersil, ISL12026IBZ Datasheet - Page 22

• Manufacturer Part Number: ISL12026IBZ
• Description: IC RTC/CALENDAR EEPROM 8-SOIC
• Manufacturer: Intersil
• Type: Clock/Calendar/EEPROMr

Specifications of ISL12026IBZ

• 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-SOIC (3.9mm Width)
• Clock Format: HH
• Clock Ic Type: RTC
• Interface Type: I2C, Serial
• Memory Configuration: 512 X 8
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: SOIC
• Rohs Compliant: Yes
• 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 9 describes 4 different
modes possible with using the BSW and SBIB bits, and how
they are affect the serial interface and battery backup
operation.
REGISTER
2
REGISTER
CONTROL
ALARM0
C Communications During Battery Backup
B (X1226
MODE
MNA0
MOA0
DWA0
Mode)
SCA0
HRA0
DTA0
INT
C
D
A
RTC AND ALARM REGISTERS ARE BOTH “30” SEC
7 6 5 4 3 2 1 0 HEX
1 0 1 0 0 0 0 0 x0h Enable Alarm and Int
SBIB BIT BSW BIT
7 6 5 4 3 2 1 0 HEX
1 0 1 1 0 0 0 0 B0h Seconds set to 30,
0 0 0 0 0 0 0 0 00h Minutes disabled
0 0 0 0 0 0 0 0 00h Hours disabled
0 0 0 0 0 0 0 0 00h Date disabled
0 0 0 0 0 0 0 0 00h Month disabled
0 0 0 0 0 0 0 0 00h Day of week disabled
OUT
0
0
1
1
:
BIT
BIT
0
1
0
1
60s
22
V
V
Standard Mode,
Standard Mode,
SWITCHOVER
Legacy Mode,
Legacy Mode,
TRIP
TRIP
V
V
VOLTAGE
DD
DD
V
= 2.2V typ
= 2.2V typ
BAT
< V
< V
Mode
enabled
BAT
BAT
DESCRIPTION
DESCRIPTION
I
2
ISL12026, ISL12026A
C ACTIVE IN
BACKUP?
BATTERY
Yes
Yes
NO
NO
TABLE 9.
READ IN BATTERY
EE PROM WRITE/
BACKUP?
• Mode A - In this mode, selection bits indicate a Standard
• Mode B - In this mode, selection bits indicate Legacy mode
• 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.
NO
NO
NO
NO
Mode switchover combined with I
backup mode. When the V
of V
mode. If the microcontroller and bus pull-ups are also
powered by the battery, then the ISL12026 can
communicate in battery backup mode.
switchover combined with I
mode. When the V
will enter battery backup mode. If the microcontroller and
bus pull-ups are also powered by the battery, then the
ISL12026 can communicate in battery backup mode. This
mode places the ISL12026 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
BAT
TRIP
2
, then the device will enter battery backup mode and
C interface will be disabled, minimizing V
or 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
BAT
voltage drops below the lower of V
voltage drops below V
, then the device will enter battery backup
, and thus battery mode current draw will
OUT
DD
2
2
BAT
BAT
BAT
BAT
C operation in battery backup mode.
C operation in battery backup mode.
voltage drops below V
open drain output pin is active in
BAT
V
V
V
V
needed on I
Battery Backup.
V
V
V
DD
BAT
TRIP
BAT
BAT
BAT
TRIP
BAT
2
current drain.
C operation in battery backup
voltage drops below the lower
. Pull-ups needed on I
.
switchover at lower of V
to operate in Battery Backup.
switchover at <V
switchover at lower of V
switchover at <V
2
C operation in battery
2
C to V
2
C interface will be
BAT
NOTES
, the device will
BAT
BAT
November 30, 2010
DD
DD
to operate in
BAT
, the device
. Pull-ups
.
2
TRIP
C to
current
BAT
BAT
FN8231.9
or
or
or