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參數(shù)資料
| 型號： | X1205V8T1 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC/CALENDAR 2-WIRE 8-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 時(shí)鐘/日歷 |
| 特點(diǎn)： | 警報(bào)器，閏年 |
| 時(shí)間格式： | HH:MM:SS（12/24 小時(shí)） |
| 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： | 8-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-TSSOP |
| 包裝： | 帶卷 (TR) |
19
FN8097.3
May 2, 2006
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 supercapacitor, which is
connected to the Vback pin. Do not use the diode to
charge a battery (especially lithium batteries!).
Figure 13. Supercapactor charging circuit
Since the battery switchover occurs at Vcc=Vback-
0.1V (see Figure 13), 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 6:
Table 6. 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
X1205
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