參數(shù)資料
型號(hào)： X1228V14Z-2.7
廠商： Intersil
文件頁(yè)數(shù)： 19/29頁(yè)
文件大小： 0K
描述： IC RTC/CAL/CPU SUP EE 14-TSSOP
標(biāo)準(zhǔn)包裝： 95
類(lèi)型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，監(jiān)控器，監(jiān)視計(jì)時(shí)器
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： -40°C ~ 85°C
安裝類(lèi)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： 管件
26
FN8100.4
May 18, 2006
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. A second consideration
is the trip point setting for the system RESET- func-
tion, known as Vtrip. Vtrip is set at the factory at levels
for systems with either Vcc = 5V or 3.3V operation,
with the following standard options:
VTRIP = 4.63V ± 3%
VTRIP = 4.38V ± 3%
VTRIP = 2.85V ± 3%
VTRIP = 2.65V ± 3%
The summary of conditions for backup battery opera-
tion is given in Table 8:
Table 8. 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
Reset
Notes
a. Normal Operation
5.00
3.00
4.38
<<1A
H
b. Vcc on with no battery
5.00
0
4.38
0
H
c. Backup Mode
0-1.8
1.8-3.0
4.38
<2A
L
Timekeeping
only
2. Example Application, Vcc = 3.3V,Vback = 3.0V
Condition
Vcc
Vback
Vtrip
Iback
Reset
a. Normal Operation
3.30
3.00
2.65
<<1A
H
b. Vcc on with no battery
3.30
0
2.65
0
H
c. Backup Mode
0-1.8
1.8-3.0*
2.65
<2A*
L
Timekeeping
only
d. UNWANTED - Vcc ON, Vback
powering
2.65 - 3.30
> Vcc
2.65
up to 3mA
H
Internal
Vcc=Vback
X1228
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