參數(shù)資料
型號： X1228V14Z-2.7A
廠商： INTERSIL CORP
元件分類： XO, clock
英文描述： EXT. DISTANCE DATA CABLE 25 CO
中文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO14
封裝： ROHS COMPLIANT, PLASTIC, MO-153AC, TSSOP-14
文件頁數(shù)： 26/31頁
文件大?。?/td> 569K
代理商： X1228V14Z-2.7A
X1228
REV 1.3 3/24/04
Characteristics subject to change without notice.
26 of 31
www.xicor.com
The best way to analyze the RTC circuit is to power it
up and read the real time clock as time advances, or if
the chip has the PHZ output, look at the output of that
pin on an oscilloscope (after enabling it with the control
register, and using a pullup resistor for an open-drain
output). Alternatively, the X1226/1286/1288 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 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. 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- 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
相關(guān)PDF資料
PDF描述
X1228S14Z-2.7T1 EXT DIST RS232 DATA CBL DB25 MALE - DB25 FEMALE
X1228V14I-2.7A RTC Module With CPU Supervisor
X1228V14I-4.5A DIODE 05 TVS SO8
X1228V14IZ RTC Module With CPU Supervisor
X1228V14IZ-2.7A RTC Module With CPU Supervisor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X1228V14Z-4.5A 功能描述:IC RTC/CAL/CPU SUP EE 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 實時時鐘 系列:- 產(chǎn)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(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
X1228ZY WAF 制造商:Intersil Corporation 功能描述:
X122K 制造商:IQD Frequency Products 功能描述:CRYSTAL OSCILLATOR 12.288000MHZ
X122-SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC
X123-133.33M 制造商:CONNOR-WINFIELD 制造商全稱:Connor-Winfield Corporation 功能描述:5.0x7.0mm Surface Mount LVCMOS Clock Oscillator Series
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*