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

seconds changes from 59 to 00) by setting the AL0 bit in the
status register to “1” and also bringing the IRQ/F
low.
Example 2 – Pulsed interrupt once per minute (IM = ”1”)
Interrupts at one minute intervals when the seconds register
is at 30 seconds.
A. Set Alarm 0 registers as follows:
B. Set the Interrupt register as follows:
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.
REGISTER
REGISTER
CONTROL
ALARM0
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
60 sec
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
OUT
I
2
C ACTIVE IN
BACKUP?
BATTERY
output
Yes
Yes
NO
NO
ISL12026
READ IN BATTERY
EE PROM WRITE/
BACKUP?
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 4 different
modes possible with using the BSW and SBIB bits, and how
they are affect the serial interface and battery backup
operation.
• 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 pullup on the pin will
need to go to V
increase accordingly.
2
NO
NO
NO
NO
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 pullups are
also powered by the battery, then the ISL12026 can
communicate in battery backup mode.
switchover combined with I
mode. When the V
device will enter battery backup mode. If the
microcontroller and bus pullups 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
2
, then the device will enter battery backup mode and
C interface will be disabled, minimizing V
TRIP
pullup to V
pullup to V
pullup to V
pullup to V
YES, needs
YES, needs
YES, needs
YES, needs
DD
DD
FREQ/IRQ
ACTIVE?
BAT
or V
voltage drops below the lower of V
voltage drops below V
, and thus battery mode current draw will
OUT
DD
BAT
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
voltage drops below V
BAT
, then the device will enter battery
V
V
to operate in Battery Backup.
V
needed on I2C to V
Battery Backup.
V
V
V
BAT
TRIP
BAT
BAT
TRIP
BAT
DD
current drain.
2
C operation in battery backup
.Pullups needed on I2C to V
.
switchover at lower of V
switchover at <V
switchover at lower of V
switchover at <V
voltage drops below the
2
C operation in battery
2
C interface will be
BAT
NOTES
, the device will
BAT
BAT
DD
DD
to operate in
October 23, 2006
BAT
. Pullups
.
, the
TRIP
current
BAT
BAT
FN8231.5
BAT
or
or
or