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參數(shù)資料
| 型號： | DS1670E |
| 英文描述： | Portable System Controller |
| 中文描述： | 便攜式系統(tǒng)控制器 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大小： | 252K |
| 代理商： | DS1670E |
DS1670
3 of 17
CS (Chip Select)
- The Chip Select signal must be asserted high during a read or a write for
communication over the 3-wire serial interface. CS had an internal 40k ohm pull down resistor.
V
CCO
(External SRAM Power Supply Output)
- This pin is internally connected to V
CC
when V
CC
is
within nominal limits. However, during power fail V
CCO
is internally connected to the V
BAT
pin.
Switchover occurs when V
CC
drops below the lower of V
BAT
or 2.7 volts.
INT (Interrupt Output)
- The INT pin is an active high output of the DS1670 that can be used as an
interrupt input to a microprocessor. The INT output remains high as long as the status bit causing the
interrupt is present and the corresponding interrupt-enable bit is set. The INT pin operates when the
DS1670 is powered by V
CC
or V
BAT
.
CEI
(RAM Chip Enable In)
-
CEI
must be driven low to enable the external RAM.
BLE
(Byte Low Enable input)
- This pin when driven low activates the
CEOL
output if
CEI
is also
driven low.
BHE
(Byte High Enable input)
- This pin when driven low activates the
CEOH
output if
CEI
is also
driven low.
CEOL
(RAM Chip Enable Out Low)
- Chip enable output for low order SRAM byte.
CEOH
(RAM Chip Enable Out High)
- Chip enable output for high order SRAM byte.
ST
(Strobe Input)
- The Strobe input pin is used in conjunction with the watchdog timer. If the
ST
pin
is not driven low within the watchdog time period, the
RST
pin is driven low.
RST
(Reset)
- The
RST
pin functions as a microprocessor reset signal. This pin is driven low 1) when
V
CC
is outside of nominal limits; 2) when the watchdog timer has “timed out”; 3) during the power up
reset period; and 4) in response to a pushbutton reset. The
RST
pin also functions as a pushbutton reset
input. When the
RST
pin is driven low, the signal is debounced and timed such that a
RST
signal of at
least 250 ms is generated. This pin has an open drain output with an internal 47 k
pull-up resistor.
AIN0, AIN1, AIN2 (Analog Inputs)
- These pins are the three analog inputs for the 3-channel analog-to-
digital converter.
X1, X2
- Connections for a standard 32.768 kHz quartz crystal. For greatest accuracy, the DS1670 must
be used with a crystal that has a specified load capacitance of 6 pF. There is no need for external
capacitors or resistors. Note: X1 and X2 are very high impedance nodes. It is recommended that they
and the crystal be guard-ringed with ground and that high frequency signals be kept away from the crystal
area. For more information on crystal selection and crystal layout considerations, please consult
Application Note 58, “Crystal Considerations with Dallas Real Time Clocks.”
The DS1670 will not function without a crystal.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1670S | Portable System Controller |
| DS17285 | 3V/5V Real-Time Clock |
| DS17285-3 | 3V/5V Real-Time Clock |
| DS17285-5 | 3V/5V Real-Time Clock |
| DS17285E-3 | 3V/5V Real-Time Clock |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1670E/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller |
| DS1670E/T&R | 功能描述:實時時鐘 Portable System Controller 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1670E/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Portable System Controller |
| DS1670E+ | 功能描述:實時時鐘 Portable System Controller 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1670E+T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 20TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CTRLR SYSTEM PORTABLE 20TSSOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock Portable System Controller |
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