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參數(shù)資料
| 型號： | DS17485 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3 Volt/5 Volt Real Time Clock(3V/5V實時時鐘) |
| 文件頁數(shù)： | 3/32頁 |
| 文件大?。?/td> | 236K |
| 代理商： | DS17485 |
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DS17485/DS17487
030598 3/32
ALE (RTC Address Strobe Input; active high)
–
A
pulse on the address strobe pin serves to demultiplex
the bus. The falling edge of ALE causes the RTC
address to be latched within the DS17485/DS17487.
RD (RTC Read Input; active low) –
RD identifies the
time period when the DS17485/DS17487 drives the bus
with RTC read data. The RD signal is an enable signal
for the output buffers of the clock.
WR (RTC Write Input; active low) –
The WR signal is
an active low signal. The WR signal defines the time
period during which data is written to the addressed reg-
ister.
CS (RTC Chip Select Input; active low) –
The Chip
Select signal must be asserted low during a bus cycle
for DS17485/DS17487 to be accessed. CS must be
kept in the active state during RD and WR timing. Bus
cycles which take place with ALE asserted but without
asserting CS will latch addresses. However, no data
transfer will occur.
IRQ (Interrupt Request Output; open drain, active
low)
–
The IRQ pin is an active low output of the
DS17485/DS17487 that can be tied to the interrupt input
of a processor. The IRQ output remains low as long as
the status bit causing the interrupt is present and the
corresponding interrupt–enable bit is set. To clear the
IRQ pin, the application software must clear all enabled
flag bits contributing to IRQ’s active state.
When no interrupt conditions are present, the IRQ level
is in the high impedance state. Multiple interrupting
devices can be connected to an IRQ bus. The IRQ pin
is an open drain output and requires an external pull-up
resistor.
PWR (Power On Output; open drain, active low)
–
The PWR pin is intended for use as an on/off control for
the system power. With V
CC
voltage removed from the
DS17485/DS17487, PWR may be automatically acti-
vated from a Kickstart input via the KS pin or from a
Wake Up interrupt. Once the system is powered on, the
state of PWR can be controlled via bits in the Dallas reg-
isters.
KS (Kickstart Input; active low)
–
When V
CC
is
removed from the DS17485/DS17487, the system can
be powered on in response to an active low transition on
the KS pin, as might be generated from a key closure.
V
BAUX
must be present and Auxiliary Battery Enable bit
(ABE) must be set to 1 if the kickstart function is used,
and the KS pin must be pulled up to the V
BAUX
supply.
While V
CC
is applied, the KS pin can be used as an inter-
rupt input.
RCLR
(RAM Clear Input; active low)
–
If enabled by
software, taking RCLR low will result in the clearing of
the 114 bytes of user RAM. When enabled, RCLR can
be activated whether or not V
CC
is present.
V
BAUX
–
Auxiliary battery input required for kickstart
and wake up features. This input also supports clock/
calendar and user RAM if V
BAT
is at lower voltage or is
not present. A standard +3 volt lithium cell or other
energy source can be used. Battery voltage must be held
between +2.5 and +3.7 volts for proper operation. If
V
BAUX
is not going to be used it should be grounded and
auxiliary battery enable bit bank 1, register 4BH,
should=0.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17485-3 | 功能描述:實時時鐘 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 |
| DS17485-3+ | 功能描述:實時時鐘 3V/5V 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 |
| DS17485-5 | 功能描述:實時時鐘 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 |
| DS17485-5+ | 功能描述:實時時鐘 3V/5V 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 |
| DS1748555 | 制造商:Maxim Integrated Products 功能描述: |
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