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参数资料
| 型号： | DS1384FP-12 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR RTC WDOG 120NS 44-MQFP |
| 标准包装： | 96 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，监视计时器 |
| 存储容量： | 50B |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.4 V ~ 4 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-QFP |
| 供应商设备封装： | 44-MQFP（10x10） |
| 包装： | 托盘 |
| 其它名称： | DS1384FP12 |
DS1384
8 of 18
Table 1. Time Of Day Alarm Mask Bits
REGISTER
MINUTES
HOURS
DAYS
DESCRIPTION
1
Alarm Once Per Minute
0
1
Alarm When Minutes Match
0
1
Alarm When Hours And Minutes Match
0
Alarm When Hours, Minutes, And Days Match
Note: any other bit combinations of mask bit settings produce illogical operation.
TIME-OF-DAY REGISTERS
Registers 0, 1, 2, 4, 6, 8, 9 and A contain time of day data in BCD. Ten bits within these eight registers
are not used and will always read 0 regardless of how they are written. Bits 6 and 7 in the Months
Register (9) are binary bits.
When set to logical 0,
EOSC (bit 7) enables the real-time clock oscillator. This bit will normally be turned
on by the user during device initialization. However, the oscillator can be turned on and off as necessary
by setting this bit to the appropriate level.
Bit 6 of this same byte controls the square wave output (pin 24). When set to logical 0, the square wave
output pin will output a 1024 Hz square wave signal. When set to logic 1 the square wave output pin is in
a high impedance state.
Bit 6 of the Hours Register is defined as the 12- or 24-Hour Select Bit. When set to logic 1, the 12-hour
format is selected. In the 12-hour format, bit 5 is the AM/ PM bit with logical one being PM. In the 24-
hour mode, bit 5 is the second 10-hour bit (20-23 hours). The time of day registers are updated every 0.01
seconds from the real time clock, except when the TE bit (bit 7 of register B) is set low or the clock
oscillator is not running.
The preferred method of synchronizing data access to and from the Watchdog Timekeeper is to access the
Command Register by doing a write cycle to address location 0B and setting the TE bit (Transfer Enable
bit) to a logic 0. This will freeze the external time of day registers at the present recorded time allowing
access to occur without danger of simultaneous update. When the watch registers have been read or
written a second write cycle to location 0B, setting the TE bit to a logic 1, will put the time of day
registers back to being updated every 0.01 second. No time is lost in the real time clock because the
internal copy of the time of day register buffers are continually incremented while the external memory
registers are frozen. An alternate method of reading and writing the time of day registers is to ignore
synchronization. However, any single read may give erroneous data as the real time clock may be in the
process of updating the external memory registers as data is being read.
The internal copies of seconds through years are incremented and Time of Day Alarm is checked during
the period that hundredths of seconds reads 99 and are transferred to the external register when
hundredths of seconds roll from 99 to 00. A way of making sure data is valid is to do multiple reads and
compare. Writing the registers can also produce erroneous results for the same reasons. A way of making
sure that the write cycle has caused proper update is to do read verifies and re-execute the write cycle if
data is not correct. While the possibility of erroneous results from reads and write cycles has been stated,
it is worth noting that the probability of an incorrect result is kept to a minimum due to the redundant
structure of the Watchdog Timekeeper.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1384FP-12+ | 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 |
| DS1384FP-120 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1384T-120 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1384T-150 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1385 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:RAMified Real Time Clock 4K x 8 |
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