ISL12026IBZ Intersil, ISL12026IBZ Datasheet - Page 14

• 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

These two power control situations are illustrated in Figures
9 and 10.
OPTION 2 -LEGACY POWER CONTROL MODE
(DEFAULT)
The Legacy Mode follows conditions set in X1226 products.
In this mode, switching from V
comparing the voltages and the device operates from
whichever is the higher voltage. Care should be taken when
changing from Normal to Legacy Mode. If the V
higher than V
and unless the battery is disconnected or the voltage
decreases, the device will no longer operate from V
To select the Option 2, BSW bit in the Power Register must
be set to “BSW = 1”
• Normal Mode (V
To transition from the V
conditions must be met:
V
• Battery Backup Mode (V
The device will switch from the V
following condition occurs:
V
The Legacy Mode power control conditions are illustrated in
Figure 11.
DD
DD
FIGURE 10. BATTERY SWITCHOVER WHEN V
FIGURE 9. BATTERY SWITCHOVER WHEN V
V
V
V
V
V
V
< V
> V
TRIP
TRIP
DD
BAT
BAT
DD
V
BAT
BAT
BAT
- V
+V
- V
V
DD
BATHYS
TRIP
BATHYS
BATHYS
, then the device will enter battery back up
DD
) to Battery Backup Mode (V
BATTERY BACKUP
DD
BATTERY BACKUP
to V
BAT
MODE
14
DD
MODE
) to Normal Mode (V
BAT
BAT
to V
mode, the following
BAT
to V
is simply done by
DD
V
TRIP
V
mode when the
BAT
BAT
BAT
+ V
BAT
+ V
TRIPHYS
BAT
< V
DD
voltage is
> V
DD
BATHYS
3.0V
2.2V
2.2V
1.8V
.
TRIP
)
)
TRIP
ISL12026
Serial Communication
The device supports the I
Clock and Data
Data states on the SDA line can change only during SCL
LOW. SDA state changes during SCL HIGH are reserved for
indicating start and stop conditions (See Figure 12).
Start Condition
All commands are preceded by the start condition, which is a
HIGH to LOW transition of SDA when SCL is HIGH. The
device continuously monitors the SDA and SCL lines for the
start condition and will not respond to any command until
this condition has been met (See Figure 13).
Stop Condition
All communications must be terminated by a stop condition,
which is a LOW to HIGH transition of SDA when SCL is
HIGH. The stop condition is also used to place the device
into the Standby power mode after a read sequence. A stop
condition can only be issued after the transmitting device
has released the bus (See Figure 13).
Acknowledge
Acknowledge is a software convention used to indicate
successful data transfer. The transmitting device, either
master or slave, will release the bus after transmitting eight
bits. During the ninth clock cycle, the receiver will pull the
SDA line LOW to acknowledge that it received the eight bits of
data (Refer to Figure 14).
The device will respond with an acknowledge after
recognition of a start condition and if the correct Device
Identifier and Select bits are contained in the Slave Address
Byte. If a write operation is selected, the device will respond
with an acknowledge after the receipt of each subsequent
eight bit word. The device will not acknowledge if the slave
address byte is incorrect.
In the read mode, the device will transmit eight bits of data,
release the SDA line, then monitor the line for an
acknowledge. If an acknowledge is detected and no stop
condition is generated by the master, the device will continue
to transmit data. The device will terminate further data
transmissions if an acknowledge is not detected. The master
must then issue a stop condition to return the device to
Standby mode and place the device into a known state.
V
BAT
FIGURE 11. BATTERY SWITCHOVER IN LEGACY MODE
Off
V
DD
2
C protocol.
VOLTAGE
On
October 23, 2006
FN8231.5
In