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参数资料
| 型号： | DS14285Q |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 4/26页 |
| 文件大小： | 515K |
| 代理商： | DS14285Q |
DS14285/DS14287
12 of 26
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
AF = AIE = 1
UF = UIE = 1
That is, IRQF = PF
PIE + AF AIE + UF UIE.
Any time the IRQF bit is a 1, the IRQ pin is driven low. All flag bits are cleared after Register C is read
by the program or when the RESET pin is low.
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 1s, the IRQ signal is active and will set
the IRQF bit. The PF bit is cleared by a RESET or 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 one will appear in the IRQF bit. A RESET or 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 or a RESET .
BIT 0 THROUGH BIT 3 - 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
VRT - The Valid RAM and Time (VRT) bit indicates the condition of the internal battery (the battery
connected to the VBAT pin in the case of the DS14285S, DS14285, and the DS14285Q). This bit is not
writable and should always be a 1 when read. If a 0 is ever present, an exhausted internal lithium energy
source is indicated and both the contents of the RTC data and RAM data are questionable. This bit is
unaffected by RESET .
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.
相关PDF资料 |
PDF描述 |
|---|---|
| DS14285 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1670S | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS14287 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1670E | 0 TIMER(S), REAL TIME CLOCK, PDSO20 |
| DS2282 | DATACOM, FRAMER, SMA30 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS14285Q+ | 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 |
| DS14285QN | 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 |
| DS14285QN+ | 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 |
| DS14285S | 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 |
| DS14285S/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC W/NV RAM CNTRL 24-SOIC |
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