參數(shù)資料
型號(hào)： DS1747WP-120
廠商： DALLAS SEMICONDUCTOR
元件分類： Timer or RTC
英文描述： REAL TIME CLOCK, DMA34
封裝： POWERCAP MODULE BOARD-34
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 246K
代理商： DS1747WP-120
DS1747/DS1747P
5 of 18
DS1746 REGISTER MAP Table 2
DATA
ADDRESS
B7
B6
B5
B4
B3
B2
B1
B0
FUNCTION/RANGE
7FFFF
10 YEAR
YEAR
00-99
7FFFE
X
10 MO
MONTH
01-12
7FFFD
X
10 DATE
DATE
01-31
7FFFC
BF
FT
X
DAY
01-07
7FFFB
X
10 HOUR
HOUR
00-23
7FFFA
X
10 MINUTES
MINUTES
00-59
7FFF9
OSC
10 SECONDS
SECONDS
00-59
7FFF8
W
R
10 CENTURY
CENTURY
00-39
OSC = STOP BIT
R
= READ BIT
FT = FREQUENCY TEST
W
= WRITE BIT
X
= SEE NOTE BELOW
BF = BATTERY FLAG
NOTE:
All indicated “X” bits are not dedicated to any particular function and can be used as normal RAM bits.
RETRIEVING DATA FROM RAM OR CLOCK
The DS1747 is in the read mode whenever OE (output enable) is low, WE (write enable) is high, and CE
(chip enable) is low. The device architecture allows ripple-through access to any of the address locations
in the NV SRAM. Valid data will be available at the DQ pins within tAA after the last address input is
stable, providing that the CE and OE access times and states are satisfied. If CE or OE access times and
states are not met, valid data will be available at the latter of chip enable access (tCEA ) or at output enable
access time (tOEA ). The state of the data input/output pins (DQ) is controlled by CE and OE. If the outputs
are activated before tAA , the data lines are driven to an intermediate state until tAA . If the address inputs
are changed while CE and OE remain valid, output data will remain valid for output data hold time (tOH )
but will then go indeterminate until the next
address access.
WRITING DATA TO RAM OR CLOCK
The DS1747 is in the write mode whenever WE, and CE are in their active state. The start of a write is
referenced to the latter occurring transition of WE or CE. The addresses must be held valid throughout
the cycle. CE or WE must return inactive for a minimum of tWR prior to the initiation of another read or
write cycle. Data in must be valid t DS prior to the end of write and remain valid for tDH afterward. In a
typical application, the OE signal will be high during a write cycle. However, OE can be active provided
that care is taken with the data bus to avoid bus contention. If OE is low prior to WE transitioning low the
data bus can become active with read data defined by the address inputs. A low transition on WE will
then disable the outputs tWEZ after WE goes active.
相關(guān)PDF資料
PDF描述
DS1747 REAL TIME CLOCK, DMA32
DS1747P REAL TIME CLOCK, DMA34
DS17485E-5 1 TIMER(S), REAL TIME CLOCK, PDSO28
DS17485-3 1 TIMER(S), REAL TIME CLOCK, PDIP24
DS17485-5 1 TIMER(S), REAL TIME CLOCK, PDIP24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1747WP-120+ 功能描述:實(shí)時(shí)時(shí)鐘 Timekeeping NV RAM 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
DS1747WP-120IND 功能描述:實(shí)時(shí)時(shí)鐘 Timekeeping NV RAM 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
DS1747WP-120IND+ 功能描述:實(shí)時(shí)時(shí)鐘 Timekeeping NV RAM 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
DS1747WP-C01 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
DS1747WP-C03+ 功能描述:實(shí)時(shí)時(shí)鐘 Timekeeping NV RAM 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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