ISL12023IVZ Intersil, ISL12023IVZ Datasheet - Page 9

• Manufacturer Part Number: ISL12023IVZ
• Description: IC RTC/CLDR TEMP SNSR 14-TSSOP
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12023IVZ

• Memory Size: 1K (128 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-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

IRQ (Interrupt Output)
This pin provides an interrupt signal output. This signal
notifies a host processor that an alarm has occurred and
requests action. It is an open drain active low output. Once
triggered, the output will stay low until the Alarm status
register bit is reset or, if the auto reset function is used, a
read is performed to the status register.
F
This pin provides a clock signal which is related to the crystal
frequency. The output frequency is user selectable and
enabled via the I
Serial Clock (SCL)
The SCL input is used to clock all serial data into and out of
the device. The input buffer on this pin is always active (not
gated). It is disabled when the backup power supply on the
V
Serial Data (SDA)
SDA is a bi-directional pin used to transfer data into and out
of the device. It has an open drain output and may be ORed
with other open drain or open collector outputs. The input
buffer is always active (not gated) in normal mode.
An open drain output requires the use of a pull-up resistor.
The output circuitry controls the fall time of the output signal
with the use of a slope controlled pull-down. The circuit is
designed for 400kHz I
when the backup power supply on the V
V
Chip power supply and ground pins. The device will operate
with a power supply from V
capacitor is recommended on the V
LVRST (Low Voltage Reset)
This pin provides an interrupt signal output. This signal
notifies a host processor that the V
below the pre-programmed level, normally 85% of nominal
V
register. It is an open drain active low output.
Functional Description
Power Control Operation
The power control circuit accepts a V
Many types of batteries can be used with Intersil RTC
products. For example, 3.0V or 3.6V Lithium batteries are
appropriate, and battery sizes are available that can power
the ISL12023 for up to 10 years. Another option is to use a
super capacitor for applications where V
up to a month. See the “Application Section” on page 24 for
more information.
OUT
BAT
DD
DD
. The brownout trip level is programmable via a control
, GND
pin is activated to minimize power consumption.
(Frequency Output)
2
C bus. It is an open drain output.
2
C interface speeds. It is disabled
DD
9
= 2.7V to 5.5VDC. A 0.1µF
DD
DD
DD
level has dropped
pin to ground.
BAT
DD
and a V
is interrupted for
pin is activated.
BAT
input.
ISL12023
Normal Mode (V
(V
To transition from the V
following conditions must be met:
Condition 1:
V
where V
Condition 2:
V
where V
Battery-Backup Mode (V
(V
The ISL12023 device will switch from the V
when one of the following conditions occurs:
Condition 1:
V
where V
Condition 2:
V
where V
These power control situations are illustrated in Figures 11
and 12.
The I
power consumption. Aside from this, all RTC functions are
operational during battery-backup mode. Except for SCL and
SDA, all the inputs and outputs of the ISL12023 are active
during battery-backup mode unless disabled via the control
register.
DD
DD
DD
DD
BAT
DD
FIGURE 11. BATTERY SWITCHOVER WHEN V
FIGURE 12. BATTERY SWITCHOVER WHEN V
V
V
V
V
V
V
< V
< V
> V
TRIP
> V
2
TRIP
BAT
DD
BAT
)
V
DD
C bus is deactivated in battery-backup mode to reduce
BAT
)
BATHYS
TRIP
BATHYS
TRIPHYS
BAT
TRIP
BAT
TRIP
- V
BATHYS
- V
+ V
V
≈ 2.2V
+ V
TRIP
BATHYS
BATHYS
≈ 50mV
≈ 50mV
TRIPHYS
≈ 30mV
DD
) to Battery-Backup Mode
BATTERY-BACKUP
DD
BATTERY-BACKUP
to V
MODE
BAT
MODE
BAT
) to Normal Mode
mode, both of the
V
V
BAT
TRIP
BAT
BAT
+ V
BAT
to V
+ V
BATHYS
TRIPHYS
June 24, 2009
DD
> V
< V
3.0V
2.2V
2.2V
1.8V
FN6682.2
TRIP
TRIP
mode