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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(shí)時時鐘/日歷) |
| 中文描述： | 實(shí)時時鐘/日歷的事件/時間戳檢測 |
| 文件頁數(shù)： | 12/27頁 |
| 文件大?。?/td> | 511K |
| 代理商： | X1209 |
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Preliminary Information
X1209
12 of 27
REV 3.0 2/11/04
www.xicor.com
Note the ALM bit can be reset by the user or cleared
automatically using the auto reset mode (see ARST
bit).
The alarm function can be enabled / disable during
battery backup mode using the FOBATB bit.
Frequency Output Mode
The X1209 has the option to provide a frequency out-
put signal using the IRQ / FOUT pin. The frequency
output mode is bit by configuring the using the FO bits
to select 16 possible output frequency values from 0
Hz to 32 kHz. The frequency output can enabled / dis-
able during battery backup mode using the FOBATB
bit.
General Purpose User SRAM
The X1209 provides 2 bytes of user SRAM. The SRAM
will also operate in battery backup mode. However the
2-wire bus is disabled in battery backup mode.
2-wire Serial Interface
The X1209 provides a 2-wire serial bus interface pro-
vides access to the control and status registers, and
the user SRAM. The 2-wire serial interface is compati-
ble with other industry 2-wire serial bus protocols using
a bi-directional data signal (SDA) and a clock signal
(SCL).
Oscillator Compensation
The X1209 provides the option of timing correction due
to temperature variation of the crystal oscillator for
either manufacturing calibration or active calibration.
The total possible compensation is +167ppm to
-94ppm (calculated). Compensation can be imple-
mented using the following:
1) The X1209 provides a digital trimming register (DTR
register) that can be used for adjust the timing counter
by ±60 ppm.
2) In addition, the X1209 provides an analog trimming
(ATR) registers that can be used to adjust an on-chip
digital capacitor for oscillator capacitance trimming.
The digital capacitor is selectable from a range of 9pF
to 40.5pF (based upon 32.758 kHz) this translates to
calculated compensation from approximately +127
ppm to -34 ppm.
An optional circuit is provided to allow for capacitance
adjustment of the crystal capacitance when the X1209
switches from V
CC
to battery backup mode.
Event / Tamper Monitor and Detection
The X1209 provides a event detection and alarm func-
tion 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 X1209 provides the following detection
options: 1) record the time of the event detection, 2)
issue a event detection alarm (via the EVDET pin) and/
or 3) set an event detection bit (EVT bit) in the status
register.
To allow for flexibility of external switches used at the
EVIN pin, the internal pullup (~1uA in full on mode) can
be disabled/enabled. This will allow for external pullup
currents and allow more flexibility depending on the
capacitive and resistive loading at the EVIN pin.
A noise filter option is also provided for the event moni-
tor circuit. The EVIN pin has a time base filter where
the EVIN signal must be stable for the given time filter
to trigger a valid detection. The time hysteresis filter
can vary from 0, 3.9ms, 15.62ms 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 every 1/4, 1, or 2
Hz.
The X1209 can operate independently or in conjunc-
tion with a microcontroller for low power operation
modes or in battery backup modes.
The event detection circuits operate is either main Vcc
power or battery backup mode.
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