音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

DS1305 Datasheet

  • DS1305

  • Serial Alarm Real Time Clock (RTC)

  • Dallas   Dallas

掃碼查看芯片數(shù)據(jù)手冊

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

DS1305
TRICKLE CHARGER RESISTOR SELECT
Table 2
RS BITS
00
01
10
11
RESISITORS
None
R1
R2
R3
TYPICAL VALUE
None
2 k鈩?/div>
4 k鈩?/div>
8 k鈩?/div>
If RS is 00, the trickle charger is disabled independent of TCS.
Diode and resistor selection is determined by the user according to the maximum current desired for
battery or super cap charging. The maximum charging current can be calculated as illustrated in the
following example. Assume that a system power supply of 5 volts is applied to V
CC1
and a super cap is
connected to V
CC2
. Also assume that the trickle charger has been enabled with 1 diode and resister R1
between V
CC1
and V
CC2
. The maximum current I MAX would therefore be calculated as follows:
I
MAX
=
~
~
(5.0V - diode drop)/R1
(5.0V - 0.7V)/2 k鈩?/div>
2.2 mA
Obviously, as the super cap charges, the voltage drop between V
CC1
and V
CC2
will decrease and therefore
the charge current will decrease.
POWER CONTROL
Power is provided through the V
CC1
, V
CC2
and V
BAT
pins. Three different power supply configurations
are illustrated in Figure 5. Configuration 1 shows the DS1305 being backed up by a non-rechargeable
energy source such as a lithium battery. In this configuration, the system power supply is connected to
V
CC1
and V
CC2
is grounded. The DS1305 will be write protected if V
CC1
is less than V
BAT
.
Configuration 2 illustrates the DS1305 being backed up by a rechargeable energy source. In this case, the
V
BAT
pin is grounded, V
CC1
is connected to the primary power supply and V
CC2
is connected to the
secondary supply (the rechargeable energy source). The DS1305 will operate from the larger of V
CC1
or
V
CC2
. When V
CC1
is greater than V
CC2
+ 0.2 volt (typical), V
CC1
will power the DS1305. When V
CC1
is
less than V
CC2
, V
CC2
will power the DS1305. The DS1305 does not write protect itself in this
configuration.
Configuration 3 shows the DS1305 in battery operate mode where the device is powered only by a single
battery. In this case, the V
CC1
and V
BAT
pins are grounded and the battery is connected to the V
CC2
pin.
Only these three configurations are allowed. Unused supply pins must be grounded.
SERIAL INTERFACE
The DS1305 offers the flexibility to choose between two serial interface modes. The DS1305 can
communicate with the SPI interface or with a standard 3-wire inter-face. The interface method used is
determined by the SERMODE pin. When this pin is connected to V
CC
, SPI communication is selected.
When this pin is connected to ground, standard 3-wire communication is selected.
9 of 22

DS1305 產(chǎn)品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 25

  • 集成電路 (IC)

  • 時鐘/計時 - 實時時鐘

  • -

  • 時鐘/日歷

  • 警報器，閏年，NVSRAM，涓流充電器

  • 96B

  • HH:MM:SS（12/24 小時）

  • YY-MM-DD-dd

  • SPI

  • 2 V ~ 5.5 V

  • 2 V ~ 5.5 V

  • 0°C ~ 70°C

  • 通孔

  • 16-DIP（0.300"，7.62mm）

  • 16-PDIP

  • 管件

DS1305相關(guān)型號PDF文件下載

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時間周一至周五
9:00-17:30

關(guān)注官方微信號，
第一時間獲取資訊。

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動力！意見一經(jīng)采納，將有感恩紅包奉上哦！