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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)： | 24/27頁 |
| 文件大?。?/td> | 511K |
| 代理商： | X1209 |
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Preliminary Information
X1209
24 of 27
REV 3.0 2/11/04
www.xicor.com
APPLICATION SECTION
CRYSTAL OSCILLATOR AND TEMPERATURE
COMPENSATION
Xicor has now integrated the oscillator compensation
circuit
Layout Considerations
The crystal
Assembly
Most electronic
Oscillator Measurements
When a proper crystal i
Backup Battery Operation
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.
Depending on the value of supercapacitor used,
backup time can last from a few days to two weeks
(with >1F). A simple silicon or Schottky barrier diode
can be used in series with Vcc to charge the superca-
pacitor, which is connected to the VBAT pin. Do not use
the diode to charge a battery (especially lithium batter-
ies!).
Figure 12. Supercapactor charging circuit
Since the battery switchover occurs at .... (see Figure
xx), ....
The summary of conditions for backup battery opera-
tion is given in Table 6:
Table 6. Battery Backup Operation
2.7-5.5V
Supercapacitor
V
SS
V
CC
V
back
1. Example Application, Vcc=5V, VBAT=3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
c. Backup Mode
Vcc
VBAT
Vtrip
Iback
Notes
2. Example Application, Vcc=3.3V,VBAT=3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
c. Backup Mode
d.
Vcc
VBAT
Vtrip
Iback
3. Example Application, Vcc=3.3V,VBAT=5.0V
a. Normal Operation
b. Vcc on with no battery
c. Backup Mode
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