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參數(shù)資料
| 型號： | DS1305EN |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| 封裝： | 4.40 MM, TSSOP-20 |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 231K |
| 代理商： | DS1305EN |
DS1305
7 of 18
PROGRAMMABLE TRICKLE CHARGER Figure 3
TRICKLE CHARGER RESISTOR SELECT Table 2
RS BITS
RESISITORS
TYPICAL VALUE
00
None
01
R1
2 k
10
R2
4 k
11
R3
8 k
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 VCC1 and a super cap is
connected to VCC2 . Also assume that the trickle charger has been enabled with 1 diode and resister R1
between VCC1 and VCC2. 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 VCC1 and VCC2 will decrease and therefore
the charge current will decrease.
POWER CONTROL
Power is provided through the VCC1, VCC2 and VBAT pins. Three different power supply configurations
are illustrated in Figure 4. 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
VCC1 and VCC2 is grounded. When VCC falls below VBAT the device switches into a low current battery
backup mode.
Upon power up, the device switches from VBAT to VCC when VCC is greater than
VBAT +0.2V. The device is write protected whenever it is switched to VBAT.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1305 | 0 TIMER(S), REAL TIME CLOCK, PDIP16 |
| DS1305N | 0 TIMER(S), REAL TIME CLOCK, PDIP16 |
| DS1305E | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS1306N | 0 TIMER(S), REAL TIME CLOCK, PDIP16 |
| DS1306 | 0 TIMER(S), REAL TIME CLOCK, PDIP16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1305EN/R | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Serial Alarm Real-Time Clock |
| DS1305EN/T | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Serial Alarm Real-Time Clock |
| DS1305EN/T&R | 制造商:Maxim Integrated Products 功能描述:SERIAL ALARM RTC 20P TSSOP IND T&R - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC RTC SERIAL ALARM IND 20-TSSOP 制造商:Maxim Integrated Products 功能描述:IC RTC YY-MM-DD 96 X 8 TSS 制造商:Maxim Integrated Products 功能描述:Real Time Clock Serial Alarm RTC 3-Wire |
| DS1305EN/T&R | 功能描述:實時時鐘 Serial Alarm RTC 3-Wire 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 |
| DS1305EN/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serial Alarm Real-Time Clock |
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