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參數(shù)資料
| 型號(hào)： | DS1672U-33 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 3 MM, MICRO, SOP-8 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 283K |
| 代理商： | DS1672U-33 |
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DS1672
10 of 15
Microprocessor Monitor
A temperature-compensated comparator circuit monitors the level of VCC. When VCC falls to the power-
fail trip point, the
RST signal (open drain) is pulled active and read/write access is inhibited. When VCC
returns to nominal levels, the
RST signal is kept in the active state for tRPU (typically) to allow the power
supply and microprocessor to stabilize. Note, however, that if the
EOSC bit is set to a logic 1 (to disable
the oscillator during write protection), the reset signal will be kept in an active state for tRPU plus the
startup time of the oscillator.
Trickle Charger
The trickle charger is controlled by the trickle charge register. The simplified schematic of Figure 5
shows the basic components of the trickle charger. The trickle charge select (TCS) bit (bits 4–7) controls
the selection of the trickle charger. In order to prevent accidental enabling, only a pattern on 1010 will
enable the trickle charger. All other patterns will disable the trickle charger. The DS1672 powers up with
the trickle charger disabled. The diode select (DS) bits (bits 2, 3) select whether or not a diode is
connected between VCC and VBACKUP. If DS is 01, no diode is selected or if DS is 10, a diode is selected.
The RS bits (bits 0, 1) select whether a resistor is connected between VCC and VBACKUP and what the value
of the resistor is. The resistor selected by the resistor select (RS) bits and the diode selected by the diode
select (DS) bits are as follows:
TCS
DS
RS
FUNCTION
X
0
X
Disabled
X
1
X
Disabled
X
0
Disabled
1
0
1
0
1
0
1
No diode, 250
resistor
1
0
1
0
1
0
1
One diode, 250
resistor
1
0
1
0
1
0
No diode, 2k
resistor
1
0
1
0
1
0
1
0
One diode, 2k
resistor
1
0
1
0
1
No diode, 4k
resistor
1
0
1
0
1
0
1
One diode, 4k
resistor
0
Initial default value—disabled
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 3V 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 = (5.0V - diode drop) / R1 (5.0V - 0.7V) / 2k 2.2mA
As the super cap changes, the voltage drop between VCC and VBACKUP will decrease and, therefore, the
charge current will decrease.
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| DS1672S-2 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1672U-3 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1672S-3 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1673S-3 | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS1673E-5 | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1672U-33/T&R | 功能描述:實(shí)時(shí)時(shí)鐘 I2C 32-Bit Binary Counter 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1672U-33/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:I2C 32-Bit Binary Counter RTC |
| DS1672U-33+ | 功能描述:實(shí)時(shí)時(shí)鐘 I2C 32-Bit Binary Counter 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1672U-33+T&R | 制造商:Maxim Integrated Products 功能描述:32 BIT COUNTER-USOP 3.3V T&R LFREE 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 8USOP - Cut TR (SOS) 制造商:Maxim Integrated Products 功能描述:Maxim Integrated DS1672U-33+T&R Real Time Clocks (RTC) 制造商:Maxim Integrated Products 功能描述:IC TIMEKEEPER 3.3V 32-BIT 8-USOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C 32-Bit Binary Counter RTC |
| DS1672U-33+T&R | 功能描述:實(shí)時(shí)時(shí)鐘 I2C 32-Bit Binary Counter 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
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