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參數(shù)資料
| 型號(hào)： | ISL1209 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power RTC with Battery Backed SRAM and Event Detection |
| 中文描述： | 低功耗RTC與電池供電SRAM和事件檢測(cè) |
| 文件頁(yè)數(shù)： | 9/24頁(yè) |
| 文件大?。?/td> | 416K |
| 代理商： | ISL1209 |
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9
FN6109.1
September 27, 2005
Power Mode, is available to allow direct switching from V
DD
to V
BAT
without requiring V
DD
to drop below V
TRIP
. Since
the additional monitoring of V
DD
vs. V
TRIP
is no longer
needed, that circuitry is shut down and less power is used
while operating from V
DD
. Power savings are typically
600nA at V
DD
= 5V. Low Power Mode is activated via the
LPMODE bit in the control and status registers.
Low Power Mode is useful in systems where V
DD
is normally
higher than V
BAT
at all times. The device will switch from
V
DD
to V
BAT
when V
DD
drops below V
BAT
, with about 50mV
of hysteresis to prevent any switchback of V
DD
after
switchover. In a system with a V
DD
= 5V and backup lithium
battery of V
BAT
= 3V, Low Power Mode can be used.
However, it is not recommended to use Low Power Mode in
a system with V
DD
= 3.3V ±10%, V
BAT
≥
3.0V, and when
there is a finite I-R voltage drop in the V
DD
line.
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
DD
source. Thereafter, the device will switchover to
battery backup mode whenever V
DD
power is lost.
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.
Event Detect Timing Diagram With
Sampling Mode Enabled
Case 1, Switched Opened Before I
pu
Case 2, Switched Opened After I
pu
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
DD
power or battery backup mode.
8 clks (8x)
15 clks (8x)
OFF
ON
OPEN
CLOSED
LOW
HIGH
HIGH
LOW
EVDET
EV
IN
EXT.
SWITCH
I
pu
8 clks (8x)
15 clks (8x)
OFF
ON
OPEN
CLOSED
LOW
HIGH
HIGH
LOW
EVDET
EV
IN
EXT.
SWITCH
I
pu
15 clks (8x)
OFF
ON
OPEN
CLOSED
LOW
HIGH
HIGH
LOW
EVDET
EV
IN
EXT.
SWITCH
I
pu
8 clks (8x)
ISL1209
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