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參數(shù)資料
| 型號： | DS1339U-33 |
| 英文描述： | Serial Real-Time Clock |
| 中文描述： | 串行實時時鐘 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 279K |
| 代理商： | DS1339U-33 |
DS1339 I
2
C Serial Real-Time Clock
14 of 18
TRICKLE CHARGER REGISTER (10h)
The simplified schematic in Figure 7 shows the basic components of the trickle charger. The trickle-charge select
(TCS) bits (bits 4 to 7) control the selection of the trickle charger. To prevent accidental enabling, only a pattern on
1010 enables the trickle charger. All other patterns disable the trickle charger. The trickle charger is disabled when
power is first applied. The diode-select (DS) bits (bits 2 and 3) select whether or not a diode is connected between
V
CC
and V
BACKUP
. The ROUT bits (bits 0 and 1) select the value of the resistor connected between V
CC
and V
BACKUP
.
Table 3 shows the bit values.
Table 3. Trickle Charger Register (10h)
BIT 7
TCS3
X
X
X
1
1
1
1
1
1
0
BIT 6
TCS2
X
X
X
0
0
0
0
0
0
0
BIT 5
TCS1
X
X
X
1
1
1
1
1
1
0
BIT 4
TCS0
X
X
X
0
0
0
0
0
0
0
BIT 3
DS1
0
1
X
0
1
0
1
0
1
0
BIT 2
DS0
0
1
X
1
0
1
0
1
0
0
BIT 1
ROUT1
X
X
0
0
0
1
1
1
1
0
BIT 0
ROUT0
X
X
0
1
1
0
0
1
1
0
FUNCTION
Disabled
Disabled
Disabled
No diode, 250 resistor
One diode, 250 resistor
No diode, 2k resistor
One diode, 2k resistor
No diode, 4k resistor
One diode, 4k resistor
Initial power-up values
The user determines diode and resistor selection 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 3.3V system power supply is applied to V
CC
and a super cap is connected to V
BACKUP
. Also assume that the
trickle charger has been enabled with a diode and resistor R2 between V
CC
and V
BACKUP
. The
maximum current I
MAX
would therefore be calculated as follows:
I
MAX
= (3.3V - diode drop) / R2 (3.3V - 0.7V) / 2k 1.3mA
As the super cap or battery charges, the voltage drop between V
CC
and V
BACKUP
decreases and therefore the
charge current decreases.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1339U-33/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS1339U-33/T&R | 功能描述:實時時鐘 I2C Serial RTC 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 |
| DS1339U-33/TR | 制造商:Maxim Integrated Products 功能描述: |
| DS1339U-33+ | 功能描述:實時時鐘 I2C Serial RTC 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 |
| DS1339U-33+ | 制造商:Maxim Integrated Products 功能描述:CLOCK IC ((NW)) |
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