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參數資料
| 型號： | X1286V14IZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | XO, clock |
| 英文描述： | Intersil Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO14 |
| 封裝： | 4.40 MM, ROHS COMPLIANT, PLASTIC, TSSOP-14 |
| 文件頁數： | 22/25頁 |
| 文件大?。?/td> | 474K |
| 代理商： | X1286V14IZ |
22
FN8101.1
April 14, 2006
devices have an IRQ- output which can be checked by
setting an alarm for each minute. Using the pulse
interrupt mode setting, the once-per-minute interrupt
functions as an indication of proper oscillation.
Backup Battery Operation
Many types of batteries can be used with the Intersil
RTC products. 3.0V or 3.6V Lithium batteries are
appropriate, and sizes are available that can power a
Intersil 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 Vback pin. Do not
use the diode to charge a battery (especially lithium
batteries!).
Figure 16. Supercapactor charging circuit
Since the battery switchover occurs at Vcc=Vback-
0.1V (see Figure 16), the battery voltage must always
be lower than the Vcc voltage during normal operation
or the battery will be drained.
The summary of conditions for backup battery opera-
tion is given in Table 9:
Table 9. Battery Backup Operation
1. Example Application, Vcc = 5V, Vback = 3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
c. Backup Mode
*since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
2.7-5.5V
Supercapacitor
V
SS
V
CC
V
back
Vcc
5.00
5.00
0-1.8
Vback
3.00
0
1.8-3.0
Vtrip
4.38
4.38
4.38
Iback
<<1μA
0
<2μA
Notes
Timekeeping only
2. Example Application, Vcc = 3.3V,Vback = 3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
c. Backup Mode
d. UNWANTED - Vcc ON, Vback
powering
Vcc
3.30
3.30
0-1.8
Vback
3.00
0
1.8-3.0*
> Vcc
Vtrip
2.65
2.65
2.65
2.65
Iback
<<1μA
0
<2μA*
up to 3mA
Timekeeping only
Internal Vcc=Vback
2.65 - 3.30
X1286
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| X1286V14Z | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Intersil Real Time Clock/Calendar/CPU Supervisor with EEPROM |
| X1288 | 制造商:XICOR 制造商全稱:Xicor Inc. 功能描述:2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM |
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