參數(shù)資料
型號(hào)： DS17487B-5
英文描述： 3V/5V Real-Time Clock
中文描述： 3V/5V實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 11/38頁(yè)
文件大?。?/td> 427K
代理商： DS17487B-5
DS17485/DS17487
11 of 38
REGISTER C
MSB
BIT 7
IRQF
IRQF – Interrupt Request Flag.
This bit is set to a 1 when one or more of the following are true:
PF = PIE = 1
AF = AIE = 1
UF = UIE = 1
i.e., IRQF = (PF x PIE) + (AF x AIE) + (UF x UIE) + (WF x WIE) + (KF x KSE) + (RF x RIE)
Any time the IRQF bit is a 1, the
IRQ
pin is driven low. Flag bits PF, AF, and UF are cleared after
Register C is read by the program.
PF – Periodic Interrupt Flag.
This is a read-only bit that is set to a 1 when an edge is detected on the
selected tap of the divider chain. The RS3 through RS0 bits establish the periodic rate. PF is set to a 1
independent of the state of the PIE bit. When both PF and PIE are 1s, the
IRQ
signal is active and sets the
IRQF bit. The PF bit is cleared by a software read of Register C.
AF
–
Alarm Interrupt Flag.
A 1 in the AF bit indicates that the current time has matched the alarm
time. If the AIE bit is also a 1, the
IRQ
pin goes low and a 1 appears in the IRQF bit. A read of Register
C clears AF.
UF – Update Ended Interrupt Flag.
This bit is set after each update cycle. When the UIE bit is set to 1,
the 1 in UF causes the IRQF bit to be a 1, which asserts the
IRQ
pin. UF is cleared by reading Register C.
BIT 3 to BIT 0
– These are unused bits of the status Register C. These bits always read 0 and cannot be
written.
REGISTER D
MSB
BIT 7
BIT 6
BIT 5
BIT 4
VRT
0
0
0
VRT
–
Valid RAM and Time.
This bit is a read-only status bit. When VRT = 0, the RTC and RAM data
are questionable and indicates that the lithium energy source has been exhausted and should be replaced.
This bit indicates that status of the V
BAT
and V
BAUX
inputs.
BIT 6 to BIT 0
– The remaining bits of Register D are not usable. They cannot be written and, when
read, they always read 0.
LSB
BIT 0
0
BIT 6
PF
BIT 5
AF
BIT 4
UF
BIT 3
0
BIT 2
0
BIT 1
0
WF = WIE= 1
KF = KSE= 1
RF = RIE = 1
LSB
BIT 0
0
BIT 3
0
BIT 2
0
BIT 1
0
相關(guān)PDF資料
PDF描述
DS17487BN-3 3V/5V Real-Time Clock
DS17487BN-5 3V/5V Real-Time Clock
DS17487N-3 3V/5V Real-Time Clock
DS17487N-5 49.9 1% 1/4W 1206
DS17486 3V/5V Real-Time Clock
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS17487BN-3 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS17487BN-5 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS17487N-3 功能描述:IC RTC 3V 4K NV RAM 24-EDIP RoHS:否 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
DS17487N-5 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS17488 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
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