ISL1209IU10Z Intersil, ISL1209IU10Z Datasheet - Page 9

• Manufacturer Part Number: ISL1209IU10Z
• Description: IC RTC LP BATT BACK SRAM 10MSOP
• Manufacturer: Intersil
• Type: Clock/Calendar/NVSRAMr

Specifications of ISL1209IU10Z

• Memory Size: 2B
• 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: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power Mode, is available to allow direct switching from V
to V
the additional monitoring of V
needed, that circuitry is shut down and less power is used
while operating from V
600nA at V
LPMODE bit in the control and status registers.
Low Power Mode is useful in systems where V
higher than V
V
of hysteresis to prevent any switchback of V
switchover. In a system with a V
battery of V
However, it is not recommended to use Low Power Mode in
a system with V
there is a finite I-R voltage drop in the V
InterSeal™ Battery Saver
The ISL1209 has the InterSeal™ Battery Saver which
prevents initial battery current drain before it is first used. For
example, battery-backed RTCs are commonly packaged on
a board with a battery connected. In order to preserve
battery life, the ISL1209 will not draw any power from the
battery source until after the device is first powered up from
the V
battery backup mode whenever V
Event/Tamper Monitor and Detection
The ISL1209 provides an event detection and alarm function
to be used in a wide variety of applications ranging from
security, warranty monitoring, data collection and recording.
The tamper detect input pin, EVIN, can be used as a event
or tamper detection input of an external switch (mechanical
or electronic). When the EVIN pin is a valid HIGH, the
ISL1209 sets the EVT bit in the status register and, can
optionally: 1) Issue an Event output signal (EVDET pin),
2) At the time event occurred, stop the RTC registers from
advancing.
To allow for flexibility of external switches used at the EVIN
pin, the internal pull-up (~1µA in full on mode) can be
disabled/enabled. This will allow more flexibility depending
on the capacitive and resistive loading at the EVIN pin.
A noise filter option is also provided for the event monitor
circuit. The EVIN pin has a time based filter where the EVIN
signal must be stable for a period of time to trigger a valid
detection. The time hysteresis filter can vary from 0, 3.9ms,
15.2ms or 31.25ms.
For low power applications the event monitor can be
sampled at a user selectable rate. The EVIN pin can be
always ON or periodically sampled with a frequency of 1/4,
1 or 2Hz.
DD
BAT
to V
DD
without requiring V
BAT
source. Thereafter, the device will switchover to
DD
BAT
when V
BAT
= 5V. Low Power Mode is activated via the
DD
= 3V, Low Power Mode can be used.
at all times. The device will switch from
= 3.3V ±10%, V
DD
DD
drops below V
. Power savings are typically
DD
DD
9
to drop below V
DD
vs. V
DD
BAT
= 5V and backup lithium
power is lost.
TRIP
BAT
≥ 3.0V, and when
DD
, with about 50mV
is no longer
line.
DD
DD
TRIP
after
is normally
. Since
DD
ISL1209
Event Detect Timing Diagram With
Sampling Mode Enabled
Case 1, Switched Opened Before I
Case 2, Switched Opened After I
Case 3, Switched Bounced
The ISL1209 can operate independently or in conjunction
with a microcontroller for low power operation modes or in
battery backup modes.
The event detection circuits operate in either main V
power or battery backup mode.
EXT.
SWITCH
EXT.
SWITCH
EXT.
SWITCH
EVDET
EVDET
EVDET
EV
EV
EV
I
I
I
pu
pu
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IN
IN
IN
CLOSED
CLOSED
CLOSED
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
OFF
OPEN
OFF
OPEN
OFF
OPEN
ON
ON
ON
8 clks (8x)
8 clks (8x)
15 clks (8x)
15 clks (8x)
15 clks (8x)
8 clks (8x)
pu
pu
October 17, 2006
DD
FN6109.4