ISL12029IB27AZ Intersil, ISL12029IB27AZ Datasheet - Page 25

• Manufacturer Part Number: ISL12029IB27AZ
• Description: IC RTC/CALENDAR EEPROM 14-SOIC
• Manufacturer: Intersil
• Type: Clock/Calendar/Supervisor/EEPROMr

Specifications of ISL12029IB27AZ

• 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: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

I
LVR Operation
Operation in Battery Backup mode and LVR 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. The most
significant detail is that once VDD goes below VRESET, then
I
is programmed for I
Table 11 describes 4 different modes possible with using the
BSW and SBIB bits, and how they are affect LVR and battery
backup operation.
• Mode A - In this mode, selection bits indicate a low VDD
2
2
C communications cease regardless of whether the device
(X1228
C Communications During Battery Backup and
MODE
mode)
switchover combined with I
mode. In actuality the VDD will go below V
switching to battery backup, which will disable I
ANYTIME the device goes into battery backup mode.
Regardless of the battery voltage, the I
to the V
A
B
C
D
TABLE 11. I
RESET
SBIB
BIT
0
0
1
1
2
voltage (see Figure 29).
C, LV RESET, AND BATTERY BACKUP OPERATION SUMMARY (SHADED ROW IS SAME AS X1228 OPERATION)
2
C operation in battery backup mode.
BSW
BIT
0
1
0
1
V
V
25
Standard Mode,
Standard Mode,
2
SWITCHOVER
Legacy Mode,
Legacy Mode,
C operation in battery backup
TRIP
TRIP
V
V
ISL12029A
VOLTAGE
Default for
Default for
ISL12029
DD
DD
V
= 2.2V typ
= 2.2V typ
BAT
< V
< V
BAT
BAT
2
C will work down
RESET
V
I
2
BAT
C ACTIVE IN
YES, only if
BACKUP?
BATTERY
2
ISL12029, ISL12029A
C
> V
NO
NO
NO
before
RESET
READ IN BATTERY
EE PROM WRITE/
BACKUP?
YES
NO
NO
NO
• Mode B - In this mode, the selection bits indicate
• Mode C - In this mode, the selection bits indicate a low
• Mode D - In this mode, the selection bits indicate
switchover to battery backup at V
communications in battery backup. In order to
communicate in battery backup mode, the V
must be less than the VBAT voltage AND V
greater than V
must go to V
as the normal operating mode of the X1228 device
VDD switchover combined with no communications in
battery backup. Operation is actually identical to Mode A
with I
communications (see Figure 29).
switchover to battery backup at V
communications in battery backup. This mode is unique in
that there is I
than V
the safest for guaranteeing I
there is a Valid V
2
C communications down to V
RESET
FREQ/IRQ
ACTIVE?
BAT
2
or V
YES
YES
YES
YES
C communication as long as VDD is higher
RESET
to communicate. This mode is the same
DD
BAT
(see Figure 30).
. Also, pull-ups on the I
, whichever is greater. This mode is
Operation of I
V
communications. Battery switchover
at V
Operation of I
backup mode, but only for
V
Bus must have pull-ups to V
nonvolatile writes with V
Operation of I
V
communications. Battery switchover
at V
Operation of I
or V
DD
BAT
DD
TRIP
TRIP
BAT
2
= V
= V
> V
C communications only when
, whichever is higher.
.
.
RESET
RESET
DD
DD
DD
> V
DD
2
2
2
2
<V
<V
C bus down to
, then below that no
C bus into battery
C bus down to
, then below that no
C bus down to V
NOTES
RESET
= V
BAT
BAT
RESET
, and I
, and no I
.
DD
RESET
2
C bus pins
December 16, 2010
BAT
must be
>V
, then no
2
BAT
C
voltage
FN6206.10
DD
RESET
. No
2
C