- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376950 > DS1305E Serial Alarm Real Time Clock RTC PDF資料下載
參數(shù)資料
| 型號： | DS1305E |
| 英文描述： | Serial Alarm Real Time Clock RTC |
| 中文描述： | 串行實(shí)時(shí)時(shí)鐘鬧鐘時(shí)鐘 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 257K |
| 代理商： | DS1305E |
DS1305
9 of 22
TRICKLE CHARGER RESISTOR SELECT
Table 2
RS BITS
RESISITORS
TYPICAL VALUE
00
None
None
01
R1
2 k
4 k
8 k
10
R2
11
R3
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
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1305N | Serial Alarm Real Time Clock RTC |
| DS1306EN | Serial Alarm Real Time Clock RTC |
| DS1306 | Serial Alarm Real Time Clock RTC |
| DS1306E | Serial Alarm Real Time Clock RTC |
| DS1306N | Serial Alarm Real Time Clock RTC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1305E/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Serial Alarm Real-Time Clock |
| DS1305E/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Serial Alarm Real-Time Clock |
| DS1305E/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC SERIAL ALARM 20-TSSOP |
| DS1305E/T&R | 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1305E/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serial Alarm Real-Time Clock |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。