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參數(shù)資料
| 型號： | ISL1219 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power RTC with Battery Backed SRAM and Event Detection(具有電池供電的SRAM和事件檢測功能的低功率RTC) |
| 中文描述： | 低功耗RTC與電池供電的SRAM和事件檢測（具有電池供電的SRAM的和事件檢測功能的低功率實(shí)時時鐘） |
| 文件頁數(shù)： | 10/25頁 |
| 文件大?。?/td> | 373K |
| 代理商： | ISL1219 |
10
FN6314.1
August 14, 2006
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 ISL1219 can operate independently or in conjunction
with a microcontroller for low power operation modes or in
battery backup modes.
The event detection and time stamp circuits operate in either
main V
DD
power or battery backup mode.
Users have the option to connect EVIN (see EVINEB bit) to
an internal pull-up current source that operates at 1
μA
(always on mode), which can drop to 400nA in battery
backup mode. User selectable event sampling modes are
also available which will effectively reduce power
consumption with 1/4-Hz, 1-Hz and 2-Hz sample detection
rates. The EVIN input is pulsed ON/OFF when in sampling
mode for power savings advantages (See tables below).
The EVIN also has a user selectable time based hysteresis
filter (see EHYS bits) to implement switch de-bouncing
during an event detection. The EVIN signal must be high for
the duration of the selected time period. The time periods
available are 0 times delay (no time based hysteresis) to
3.9ms, 15.625ms or 31.25ms (see Table 1, 2, 3, and 4).
Real Time Clock Operation
The Real Time Clock (RTC) uses an external 32.768kHz
quartz crystal to maintain an accurate internal representation
of second, minute, hour, day of week, date, month, and year.
The RTC also has leap-year correction. The clock also
corrects for months having fewer than 31 days and has a bit
that controls 24 hour or AM/PM format. When the ISL1219
powers up after the loss of both V
DD
and V
BAT
, the clock will
not begin incrementing until at least one byte is written to the
clock register.
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)
TABLE 1.
I
DD
(V
DD
=3V, t
HYS
=3.9ms)
f
SMP
DELTA I
DD
1/4Hz
20.5nA
1Hz
82nA
2Hz
164nA
TABLE 2.
I
DD
(V
DD
=5.0V, t
HYS
=3.9ms)
f
SMP
DELTA I
DD
1/4Hz
65.8nA
1Hz
263.3nA
2Hz
526.5nA
TABLE 3.
I
DD
(V
DD
=3.0V, t
HYS
=15.625ms)
f
SMP
DELTA I
DD
1/4Hz
82nA
1Hz
328nA
2Hz
656.3nA
TABLE 4.
I
DD
(V
DD
=5.0V, t
HYS
=15.625ms)
f
SMP
DELTA I
DD
1/4Hz
264nA
1Hz
1.05μA
2Hz
2.1μA
ISL1219
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