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参数资料
| 型号： | DS1339AD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/19页 |
| 文件大小： | 0K |
| 描述： | IC RTC I2C W/ALARM 8TDFN-EP |
| 标准包装： | 3,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，涓流充电器 |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 1.71 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
DS1339A
Low-Current, I2C, Serial Real-Time Clock
14
Maxim Integrated
Trickle Charger (10h)
The simplified schematic in Figure 3 shows the basic components of the trickle charger. The trickle-charge select bits
(TCS[3:0]) 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[1:0]) bits select whether or not a diode is connected between VCC and VBACKUP. The ROUT[1:0]
bits select the value of the resistor connected between VCC and VBACKUP. Table 6 shows the register settings.
Figure 3. Trickle Charger
Warning: The ROUT value of 200I must not be selected whenever VCC is greater than 3.63V.
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 VCC and a super cap is connected to VBACKUP. Also assume that the trickle
charger has been enabled with a diode and resistor R2 between VCC and VBACKUP. The maximum current IMAX would
therefore be calculated as follows:
IMAX = (3.3V - diode drop) / R2 ≈ (3.3V - 0.7V) / 2kI ≈ 1.3mA
As the super cap or battery charges, the voltage drop between VCC and VBACKUP decreases and therefore the charge
current decreases.
Table 6. Trickle Charger Register (10h)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
X
0
X
Disabled
X
1
X
Disabled
X
0
Disabled
1
0
1
0
1
0
1
No diode, 200I resistor
1
0
1
0
1
0
1
One diode, 200I resistor
1
0
1
0
1
0
No diode, 2kI resistor
1
0
1
0
1
0
1
0
One diode, 2kI resistor
1
0
1
0
1
No diode, 4kI resistor
1
0
1
0
1
0
1
One diode, 4kI resistor
0
Initial power-up values
R1
200
R2
2k
R3
4k
VCC
VBACKUP
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
TRICKLE-
CHARGE
REGISTER
1 0F 16 SELECT
NOTE: ONLY 1010 CODE ENABLES CHARGER
1 OF 2
SELECT
1 OF 3
SELECT
TCS[3:0] = TRICKLE-CHARGE SELECT
DS[1:0] = DIODE SELECT
ROUT[1:0] = RESISTOR SELECT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1339AU | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Current, I2C, Serial Real-Time Clock |
| DS1339AU+ | 功能描述:实时时钟 1.8-3.3V Serial RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1339AU+T | 功能描述:实时时钟 1.8-3.3V Serial RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1339BU+ | 功能描述:实时时钟 SERIAL RTC 1.8-3.3V C 1.8-3.3V HESR USOP RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1339BU+T | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC 1.8-3.3V HESR USOP TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC I2C W/ALARM 8UMAX |
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