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參數(shù)資料
| 型號： | X1286V14T1 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC/CAL/CPU SUP EE 14-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 時鐘/日歷 |
| 特點(diǎn)： | 警報器，閏年，監(jiān)控器，監(jiān)視計時器 |
| 時間格式： | HH:MM:SS:hh（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | I²C，2 線串口 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電壓 - 電源，電池： | 1.8 V ~ 5.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
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
*since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
2.7-5.5V
Supercapacitor
VSS
VCC
Vback
1. Example Application, Vcc = 5V, Vback = 3.0V
Condition
Vcc
Vback
Vtrip
Iback
Notes
a. Normal Operation
5.00
3.00
4.38
<<1A
b. Vcc on with no battery
5.00
0
4.38
0
c. Backup Mode
0-1.8
1.8-3.0
4.38
<2A
Timekeeping only
2. Example Application, Vcc = 3.3V,Vback = 3.0V
Condition
Vcc
Vback
Vtrip
Iback
a. Normal Operation
3.30
3.00
2.65
<<1A
b. Vcc on with no battery
3.30
0
2.65
0
c. Backup Mode
0-1.8
1.8-3.0*
2.65
<2A*
Timekeeping only
d. UNWANTED - Vcc ON, Vback
powering
2.65 - 3.30
> Vcc
2.65
up to 3mA
Internal Vcc=Vback
X1286
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