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參數(shù)資料
| 型號： | DS17485E-5 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | TSOP-28 |
| 文件頁數(shù)： | 3/38頁 |
| 文件大小： | 400K |
| 代理商： | DS17485E-5 |
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DS17485/DS17487
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REGISTER C
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
IRQF
PF
AF
UF
0
IRQF - The Interrupt Request Flag (IRQF) bit is set to a 1 when one or more of the following are true:
PF = PIE = 1
WF = WIE= 1
AF = AIE = 1
KF = KSE= 1
UF = UIE = 1
RF = RIE = 1
i.e., IRQF = (PF
PIE) + (AF AIE) + (UF UIE) + (WF WIE) + (KF KSE) + (RF 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 - The Periodic Interrupt Flag (PF) is a read-only bit which 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 1’s, the IRQ signal is active and will
set the IRQF bit. The PF bit is cleared by a software read of Register C.
AF - A 1 in the Alarm Interrupt Flag (AF) bit indicates that the current time has matched the alarm time.
If the AIE bit is also a 1, the IRQ pin will go low and a 1 will appear in the IRQF bit. A read of Register
C will clear AF.
UF - The Update Ended Interrupt Flag (UF) 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 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 0 and
cannot be written.
REGISTER D
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
VRT
0
0000
00
VRT - The Valid RAM and Time 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 VBAT and VBAUX 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 0.
NONVOLATILE RAM - RTC
The general purpose nonvolatile RAM bytes are not dedicated to any special function within the
DS17485/DS17487. They can be used by the application program as nonvolatile memory and are fully
available during the update cycle.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS17485-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS17485-5 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS17485S-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17485S-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17485E-3 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17485E-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 |
| DS17485EN-3 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock |
| DS17485EN-5 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock |
| DS17485N-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| DS17485N-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
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