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參數(shù)資料
| 型號： | DS1672U-33 |
| 英文描述： | Low Voltage Serial Timekeeping Chip |
| 中文描述： | 低電壓串行時(shí)鐘芯片 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 104K |
| 代理商： | DS1672U-33 |
DS1672
3 of 13
OSCILLATOR CONTROL
The
EOSC
bit (bit 7 of the control register) controls the oscillator when in back-up mode. This bit when
set to logic 0 will start the oscillator. When this bit is set to a logic 1, the oscillator is stopped and the
DS1672 is placed into a low-power standby mode with a current drain of less than 200 nanoamps when in
back-up mode. When the DS1672 is powered by V
CC,
the oscillator is always on regardless of the status
of the
EOSC
bit; however, the counter is incremented only when
EOSC
is a logic 0.
CRYSTAL SELECTION
A standard 32.768 kHz quartz crystal should be directly connected to the X1 and X2 oscillator pins. The
crystal selected for use should have a specified load capacitance (C
L
) of 6 pF. For more information on
crystal selection and crystal layout considerations, please consult Application Note 58, “Crystal
Considerations with Dallas Real Time Clocks.”
MICROPROCESSOR MONITOR
A temperature-compensated comparator circuit monitors the level of V
CC
. When V
CC
falls to the power-
fail trip point, the
RST
signal (open drain) is pulled active. When V
CC
returns to nominal levels, the
RST
signal is kept in the active state for 250 ms (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 250 ms plus the start-up time of the
oscillator.
TRICKLE CHARGER
The trickle charger is controlled by the trickle charge register. The simplified schematic of Figure 3
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 V
CC
and V
BACKUP
. 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 V
CC
and V
BACKUP
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
X
X
X
1
1
1
1
1
1
TCS
X
X
X
0
0
0
0
0
0
TCS
X
X
X
1
1
1
1
1
1
TCS
X
X
X
0
0
0
0
0
0
DS
0
1
X
0
1
0
1
0
1
DS
0
1
X
1
0
1
0
1
0
RS
X
X
0
0
0
1
1
1
1
RS
X
X
0
1
1
0
0
1
1
Function
Disabled
Disabled
Disabled
No diode, 100
resistor
One diode, 100
resistor
No diode, 2 k
resistor
One diode, 2 k
resistor
No diode, 4 k
resistor
One diode, 4 k
resistor
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| DS1672 | Low Voltage Serial Timekeeping Chip |
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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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