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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(shí)間標(biāo)記檢測與報(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 |
| 文件頁數(shù)： | 11/27頁 |
| 文件大?。?/td> | 511K |
| 代理商： | X1209 |
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11 of 27
REV 3.0 2/11/04
www.xicor.com
Preliminary Information
X1209
FUNCTIONAL DESCRIPTION
POWER CONTROL OPERATION
The power control circuit accepts a V
CC
and a VBAT
input. Many types of batteries can be used with the
Xicor RTC products. 3.0V or 3.6V Lithium batteries are
appropriate, and sizes are available that can power a
Xicor RTC device for up to 10 years. Another option is
to use a supercapacitor for applications where Vcc
may disappear intermittently for short periods of time.
See application for more information.
Normal Mode (V
CC
) to Battery Backup Mode (V
BAT
).
To transition from VCC to VBAT source, the following
conditions must exist:
Condition 1: V
CC
< V
BAT
- V
HYS
, where V
HYS1
is +/-
50mV.
and
Condition 2: V
CC
< V
MW
, where V
MW
is ~1.8V.
Battery Backup Mode (V
BAT
) to Normal Mode (V
CC
).
To transition from VBAT to VCC source, the following
conditions must exist:
V
CC
> V
MW
+ V
HYS2
, where V
HYS2
is + 50mV.
Power Failure Detection.
The X1209 provides a Real Time Clock Failure Bit
(RTCF) to detect total power failure
Low Power Modes.
The X1209...
Other Notes.
The 2-wire bus is inactive in battery backup mode. The
Status Register and the Alarm Registers are opera-
tional during battery backup mode. All the inputs and
outputs of the X1209 are active during battery backup
mode unless disabled via the control register. The User
SRAM is operational in battery backup mode down to
1.8V.
POWER RAMP RATE
The power ramp rate recommended is....
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external
32.768kHz quartz crystal to maintain an accurate inter-
nal representation of second, minute, hour, day, date,
month, and year. The RTC 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 X1209 powers up after the loss of
both V
CC
and VBAT, the clock will not operate until at
least one byte is written to the clock register.
Accuracy of the Real Time Clock
The accuracy of the Real Time Clock depends on the
frequency of the quartz crystal that is used as the time
base for the RTC. Since the resonant frequency of a
crystal is temperature dependent, the RTC perfor-
mance will also be dependent upon temperature. The
frequency deviation of the crystal is a function of the
turnover temperature of the crystal from the crystal’s
nominal frequency. For example, a >20ppm frequency
deviation translates into an accuracy of >1 minute per
month. These parameters are available from the crystal
manufacturer. Xicor’s RTC family provides on-chip crys-
tal compensation networks to adjust load-capacitance to
tune oscillator frequency from +185 ppm to –94 ppm
(calculated). For more detail information see the Appli-
cation Notes.
Standard and Pulse Interrupt Alarm Modes
The alarm mode is enabled via the ALME bit. Choos-
ing standard and pulse (repetitive) interrupt alarm
mode is selected via the IM bit. Note that when the fre-
quency output function is enabled the alarm function is
disabled.
The standard alarm allows for time alarms for time,
date, day of the week and year. When a time alarm
occurs a IRQ pin will be pulled low and the alarm sta-
tus bit (ALM) will be set to “1”.
The pulsed interrupt mode allows for repetitive or
recurring alarm functionality. Hence an repetitive or
recurring alarm can be set for every n
th
second, or n
th
minute, or n
th
hour, or n
th
date, or for the same day of
the week. The pulsed interrupt mode can be consid-
ered a repetitive interrupt mode, with the repetition rate
set by the time setting of the alarm. During a pulsed
interrupt mode, the IRQ pin will be pulled low for
250ms and the alarm status bit (ALM) will be set to “1”.
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