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參數(shù)資料
| 型號： | X1209 |
| 英文描述： | Real Time Clock/Calendar with Event/Timestamp Detection & Alarms(帶有事件/時間標(biāo)記檢測與報警功能的實時時鐘/日歷) |
| 中文描述： | 實時時鐘/日歷的事件/時間戳檢測 |
| 文件頁數(shù)： | 10/27頁 |
| 文件大小： | 511K |
| 代理商： | X1209 |
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Preliminary Information
X1209
10 of 27
REV 3.0 2/11/04
www.xicor.com
Event Input (EVIN)
The EVIN is an input pin that is used to detect an exter-
nally monitored event. When a high signal is present at
the EVIN pin an “event” is detected. Upon a valid
detection, the X1209 has the option to 1) provide a flag
signal at the EVDET pin (open drain, active low), 2)
record a time stamp when the event occurred, 3) set a
status bit (EVT bit). Note that on detection the EVT bit
is set then the EVDET pin is pulled low.
The EVIN pin can be optionally connected (see
EVINEB bit) to an internal pull up current source that
operates to 1uA (always on mode). User selectable
event sampling modes are also available for low power
applications with 1/4-Hz, 1-Hz and 2-Hz sample detec-
tion rates. The EVIN input is pulsed ON/OFF when in
sampling mode for power savings advantages.
The EVIN also has a user selectable time based hys-
tersis filter (see EHYS bits) to “filter out” circuit de-
bouncing and noise during an event detection. The
EVIN signal must be high for the duration of the time fil-
ter. The time filter can be selected from 0 time delay
(no time based hysteresis) to 3.9ms (2048Hz),
15.625ms (512Hz), or 31.25ms (256Hz).
The event detection circuit can be user enabled/dis-
abled (see EVEN bit) and has the option to be opera-
tional in battery backup modes (see EVBATB bit).
When the event detection is disabled the EVIN pin is
gated OFF. See Functional Description for more
details.
Figure 2. Recommended Crystal connection
VCC, VSS
Chip supply and ground pins.
PIN OUT
X1
X2
10-Pin MSOP
X1209
NC = No internal connection
10-lead FCP
Bump
Chip
Scale
tbd
1
2
3
4
5
9
8
7
6
10
X1
X2
V
BAT
V
SS
EVIN
V
CC
IRQ / FOUT
SCL
SDA
EVDET
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