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參數(shù)資料
| 型號： | X1227S8-2.7 |
| 元件分類： | CPU監(jiān)測 |
| 英文描述： | RTC Module With CPU Supervisor |
| 中文描述： | 時鐘模塊CPU監(jiān)控 |
| 文件頁數(shù)： | 23/28頁 |
| 文件大?。?/td> | 442K |
| 代理商： | X1227S8-2.7 |
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X1227
REV 1.1.20 1/13/03
Characteristics subject to change without notice.
23 of 28
www.xicor.com
by the parasitic elements in the scope probe. Applying
a scope probe can possibly cause a faulty oscillator to
start up, hiding other issues (although in the Xicor
RTC’s, the internal circuitry assures startup when
using the proper crystal and layout). The best way to
analyze the RTC circuit is to power it up and read the
real time clock as time advances.
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 Vback pin. Do not
use the diode to charge a battery (especially lithium
batteries!).
Figure 16. Supercapacitor 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- function,
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:
V
TRIP
= 4.63V ± 3%
V
TRIP
= 4.38V ± 3%
V
TRIP
= 2.85V ± 3%
V
TRIP
= 2.65V ± 3%
The summary of conditions for backup battery opera-
tion is given in Table 8:
2.7-5.5V
Supercapacitor
V
SS
V
CC
V
back
Table 8. Battery Backup Operation
1. Example Application, Vcc=5V, Vback=3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
*since Vback>2.65V is higher than Vtrip, the battery is powering the entire device
Vcc
5.00
5.00
Vback
3.00
0
Vtrip
4.38
4.38
Iback
<<1μA
0
Reset
H
H
Notes
c. Backup Mode
0
–
1.8
1.8-3.0
4.38
<2μA
L
Timekeeping
only
2. Example Application, Vcc=3.3V,Vback=3.0V
Condition
a. Normal Operation
b. Vcc on with no battery
Vcc
3.30
3.30
Vback
3.00
0
Vtrip
2.65
2.65
Iback
<<1μA
0
Reset
H
H
c. Backup Mode
0
–
1.8
1.8
–
3.0*
2.65
<2μA*
L
Timekeeping
only
Internal
Vcc=Vback
d. UNWANTED - Vcc ON, Vback
powering
2.65 - 3.30
> Vcc
2.65
up to 3mA
H
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| X1227S8-4.5A | 功能描述:IC RTC CPU SUP WDT 4K EE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN EP 包裝:管件 |
| X1227S8I | 功能描述:IC RTC/CAL/CPU SUP EE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN EP 包裝:管件 |
| X1227S8I-2.7 | 功能描述:IC RTC/CAL/CPU SUP EE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN EP 包裝:管件 |
| X1227S8I-2.7A | 功能描述:IC RTC/CAL/CPU SUP EE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:時鐘/日歷 特點:警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤 供應商設備封裝:8-TDFN EP 包裝:管件 |
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