參數(shù)資料
型號(hào)： X1209
英文描述： Real Time Clock/Calendar with Event/Timestamp Detection & Alarms(帶有事件/時(shí)間標(biāo)記檢測(cè)與報(bào)警功能的實(shí)時(shí)時(shí)鐘/日歷)
中文描述： 實(shí)時(shí)時(shí)鐘/日歷的事件/時(shí)間戳檢測(cè)
文件頁(yè)數(shù)： 9/27頁(yè)
文件大?。?/td> 511K
代理商： X1209
9 of 27
REV 3.0 2/11/04
www.xicor.com
Preliminary Information
X1209
DESCRIPTION
The X1209 device is a low power Real Time Clock with
crystal and timing compensation, tamper or event
detection, clock/calendar, one polled alarm, power indi-
cator, periodic and polled alarms and battery backup
switch.
The oscillator uses an external, low-cost 32.768kHz
crystal. The Real-Time Clock keeps track of time with
separate registers for Hours, Minutes, and Seconds.
The Calendar has separate registers for Date, Month,
Year and Day-of-week. The calendar is correct through
2099, with automatic leap year correction.
The powerful alarm can be set to any Clock/Calendar
value for a match. For instance, every minute, every
Tuesday, or 5:23 AM on March 21. The alarm can be
polled in the Status Register or provide a hardware
interrupt (IRQ Pin). There is a repeat mode for the
alarms allowing a periodic interrupt of 60-seconds, 1-
hour, 1-day, once-a-week, etc.
The device offers a backup power input pin. This VBAT
pin allows the device to be backed up by battery or
SuperCap. The entire X1209 device is fully operational
from 2.0V to 5.5 volts and the clock/calendar portion of
the X1209 device remains fully operational down to 1.8
volts (Standby Mode).
The event detection function can be used for tamper
detection, security or other chassis or generic system
monitoring. Upon a valid event detection, the X1209
provides the following options: 1) to issue an event out-
put signal pin (EVDET), 2) to sets an event detection
bit (EVT bit) in the status register and 3) to store the
timestamp when the event occured. The event monitor
can function in both main VCC and battery backup
modes. For low power savings the event monitor can
be configured for various input detection rates. The
event input monitor pin (EVIN) also has a selectable
glitch filter to avoid switch de-bouncing.
PIN DESCRIPTION
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device. The input buffer on this pin is always active
(not gated). Disabled when the backup power supply
on the V
BAT
pin is activated.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and
out of the device. It has an open drain output and may
be wire ORed with other open drain or open collector
outputs. The input buffer is always active (not gated).
An open drain output requires the use of a pull-up
resistor. The output circuitry controls the fall time of the
output signal with the use of a slope controlled pull-
down. The circuit is designed for 400kHz 2-wire inter-
face speeds. Disabled when the backup power supply
on the V
BAT
pin is activated.
V
BAT
This input provides a backup supply voltage to the
device. V
BAT
supplies power to the device in the event
the V
CC
supply fails. This pin can be connected to a
battery, a Supercap or tied to ground if not used.
Interrupt Output – IRQ, Frequency Output– FOUT
Multi-functional pin set via configuration register that
can be used as interrupt or frequency output pin.
Interrupt Mode. This is an interrupt signal output. This
signal notifies a host processor that an alarm has
occurred and requests action. It is an open drain active
low output.This mode is selected via the frequency out
control bits.
Frequency Output Mode. This is an frequency output
pin. The frequency output is user selectable and
enabled via the 2-wire bus. This mode is selected via
the frequency out control bits.
X1, X2
The X1 and X2 pins are the input and output, respec-
tively, of an inverting amplifier. An external 32.768kHz
quartz crystal is used with the X1209 to supply a time-
base for the real time clock. The device can also be
driven directly from a 32.768kHz source. Internal com-
pensation circuitry is included to form a complete oscilla-
tor circuit with accuracy over the operating temperature
range from -40C to +85C. The oscillator compensation
network can be used either calibrate the crystal pull-over
accuracy over temperature during manufacturing calibra-
tion or used with external temperature sensor and micro-
controller for active compensation.
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