參數(shù)資料
型號(hào)： DS1556-70IND+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 2/18頁(yè)
文件大?。?/td> 0K
描述： IC RTC RAM Y2K 5V 70NS 32-EDIP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 11
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，NVSRAM，監(jiān)視計(jì)時(shí)器，Y2K
存儲(chǔ)容量： 128KB
時(shí)間格式： HH:MM:SS（24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： 并聯(lián)
電源電壓： 4.5 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 32-DIP 模塊（0.600"，15.24mm）
供應(yīng)商設(shè)備封裝： 32-EDIP
包裝： 管件
DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
10 of 18
USING THE WATCHDOG TIMER
The watchdog timer can be used to detect an out-of-control processor. The user programs the watchdog
timer by setting the desired amount of time-out into the 8-bit Watchdog Register (Address 1FFF7h). The
five Watchdog Register bits BMB4 to BMB0 store a binary multiplier and the two lower order bits RB1
to RB0 select the resolution, where 00=1/16 second, 01=1/4 second, 10=1 second, and 11=4 seconds. The
watchdog timeout value is then determined by the multiplication of the 5-bit multiplier value with the
2-bit resolution value. (For example: writing 00001110 in the Watchdog Register = 3 x 1 second or
3 seconds.) If the processor does not reset the timer within the specified period, the Watchdog Flag (WF)
is set and a processor interrupt is generated and stays active until either the Watchdog Flag (WF) is read
or the Watchdog Register (1FFF7h) is read or written.
The most significant bit of the Watchdog Register is the Watchdog Steering Bit (WDS). When set to a 0,
the watchdog will activate the
IRQ/FT output when the watchdog times out.
When WDS is set to a 1, the watchdog will output a negative pulse on the
RST output for a duration of
40ms to 200ms. The Watchdog Register (1FFF7h) and the FT bit will reset to a 0 at the end of a
watchdog timeout when the WDS bit is set to a 1.
The watchdog timer resets when the processor performs a read or write of the Watchdog Register. The
time-out period then starts over. The watchdog timer is disabled by writing a value of 00h to the
Watchdog Register. The watchdog function is automatically disabled upon power-up and the Watchdog
Register is cleared. If the watchdog function is set to output to the
IRQ/FT output and the frequency test
function is activated, the watchdog function prevails and the frequency test function is denied.
POWER-ON DEFAULT STATES
Upon application of power to the device, the following register bits are set to a 0:
WDS = 0, BMB0 to BMB4 = 0, RB0 to RB1 = 0, AE = 0, ABE = 0.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1556-70IND+ 功能描述:實(shí)時(shí)時(shí)鐘 1M NV RAM Timekeeper 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
DS1556-70-W 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
DS1556P 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1MEG NV Y2KC Real Time Clocks RAM
DS1556P/YP/WP 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:PowerCap with Crystal
DS1556P-70 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
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