參數(shù)資料
型號(hào)： DS17485
廠商： Maxim Integrated Products, Inc.
英文描述： 3 Volt/5 Volt Real Time Clock(3V/5V實(shí)時(shí)時(shí)鐘)
文件頁(yè)數(shù)： 12/32頁(yè)
文件大?。?/td> 236K
代理商： DS17485
DS17485/DS17487
030598 12/32
UF
–
The Update Ended Interrupt Flag (UF) bit is set
after each update cycle. When the UIE bit is set to one,
the one in UF causes the IRQF bit to be a one which will
assert the IRQ pin. UF is cleared by reading Register C.
BIT 3 THROUGH BIT 0 –
These are unused bits of the
status Register C. These bits always read zero and can-
not be written.
REGISTER D
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
VRT
0
0
0
0
0
0
0
VRT
–
The Valid RAM and Time bit is a read only status
bit. When VRT = 0, the RTC and RAM data are ques-
tionable and indicates that the lithium energy source
has been exhausted and should be replaced. This bit
indicates the status of the V
BAT
and V
BAUX
inputs.
BIT 6 THROUGH BIT 0 –
The remaining bits of Register
D are not usable. They cannot be written and, when
read, they will always read zero.
EXTENDED FUNCTIONS
The
extended
DS17485/DS17487 that are new to the RAMified RTC
family are accessed via a software controlled bank
switching scheme, as illustrated in Figure 4. In bank 0,
the clock/calendar registers and 50 bytes of user RAM
are in the same locations as for the DS1287. As a result,
functions
provided
by
the
existing routines implemented within BIOS, DOS, or
application software packages can gain access to the
DS17485/DS17487 clock registers with no changes.
Also in bank 0, an extra 64 bytes of RAM are provided at
addresses just above the original locations for a total of
114 directly addressable bytes of user RAM.
When bank 1 is selected, the clock/calendar registers
and the original 50 bytes of user RAM still appear as
bank 0. However, the Dallas registers which provide
control and status for the extended functions will be
accessed in place of the additional 64 bytes of user
RAM. The major extended functions controlled by the
Dallas registers are listed below:
1. 64–bit Silicon Serial Number
2. Century counter
3. Date Alarm
4. Auxiliary Battery Control/Status
5. Wake Up
6. Kickstart
7. RAM Clear Control/Status
8. 4K bytes Extended RAM Access
The bank selection is controlled by the state of the DV0
bit in register A. To access bank 0 the DV0 bit should be
written to a 0. To access bank 1, DV0 should be written
to a 1. Register locations designated as reserved in the
bank 1 map are reserved for future use by Dallas Semi-
conductor. Bits in these locations cannot be written and
will return a 0 if read.
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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(shí)時(shí)時(shí)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(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
DS17485-3+ 功能描述:實(shí)時(shí)時(shí)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(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
DS17485-5 功能描述:實(shí)時(shí)時(shí)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(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
DS17485-5+ 功能描述:實(shí)時(shí)時(shí)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(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
DS1748555 制造商:Maxim Integrated Products 功能描述:
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