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参数资料
| 型号： | DS17885N-3 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封装： | DIP-24 |
| 文件页数： | 3/38页 |
| 文件大小： | 410K |
| 代理商： | DS17885N-3 |
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DS17885/DS17887
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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 – Interrupt Request Flag. This 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 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
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
VRT
0
0000
00
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 VBAT and VBAUX 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS17885N-5 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock |
| DS17885S-3 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS17885S-3+ | 功能描述:实时时钟 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS17885S-5 | 功能描述:实时时钟 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS17885S-5/T&R+ | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 8KBYTE 24SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC 5V 8K NV RAM 24-SOIC |
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