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参数资料
| 型号： | DS1392U-18 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封装： | MO-187CBA, MICRO, SOP-10 |
| 文件页数： | 14/24页 |
| 文件大小： | 742K |
| 代理商： | DS1392U-18 |
D
Hundredths-of-Seconds
Generator
The hundredths-of-seconds generator circuit shown in
the functional diagram is a state machine that divides
the incoming frequency (4096Hz) by 41 for 24 cycles
and 40 for one cycle. This produces a 100Hz output
that is slightly off during the short term, and is exactly
correct every 250ms. The divide ratio is given by:
Ratio = [41 x 24 + 40 x 1] / 25 = 40.96
Thus, the long-term average frequency output is
exactly the desired 100Hz.
Clock and Calendar
The time and calendar information is obtained by read-
ing the appropriate register bytes. See Table 2 for the
RTC registers. The time and calendar are set or initial-
ized by writing the appropriate register bytes. The con-
tents of the time and calendar registers are in the
binary-coded decimal (BCD) format. The day-of-week
register increments at midnight. Values that correspond
to the day-of-week are user-defined but must be
sequential (i.e., if 1 equals Sunday, then 2 equals
Monday, and so on). Illogical time and date entries
result in undefined operation. The DS1390–DS1393 can
run in either 12-hour or 24-hour mode. Bit 6 of the hours
register is defined as the 12- or 24-hour mode-select
bit. When high, the 12-hour mode is selected. In the 12-
hour mode, bit 5 is the
AM
/PM bit with logic high being
PM. In the 24-hour mode, bit 5 is the second 10-hour
bit (20 to 23 hours). Changing the 12/
24
-hour mode-
select bit requires that the hours data be re-entered,
including the alarm register (if used). The century bit
(bit 7 of the month register) is toggled when the years
register overflows from 99 to 00.
Alarms
All four devices contain one time-of-day/date alarm.
Writing to registers 88h through 8Ch sets the alarm.
The alarm can be programmed (by the alarm enable
and INTCN bits of the control register) to activate the
SQW/
INT
or
INT
output on an alarm-match condition.
The alarm can activate the SQW/
INT
or
INT
output while
the device is running from V
BACKUP
if BBSQI is
enabled. Bit 7 of each of the time-of-day/date alarm
registers are mask bits (Table 3). When all the mask
bits for each alarm are logic 0, an alarm only occurs
when the values in the timekeeping registers 00h to 06h
match the values stored in the time-of-day/date alarm
registers. The alarms can also be programmed to
repeat every second, minute, hour, day, or date. Table
3 shows the possible settings. Configurations not listed
in the table result in illogical operation.
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
14
____________________________________________________________________
ALARM REGISTER MASK BITS (BIT 7)
AM4
AM3
1
1
1
1
1
1
REGISTER
08H
DY/DT
AM2
1
1
1
AM1
1
1
1
ALARM RATE
FFh
X
X
X
Alarm every 1/100th of a second
Alarm when hundredths of seconds match
Alarm when tenths, hundredths of seconds match
F[0–9]h
[0–9][0–9]
[0–9][0–9]
X
1
1
1
0
Alarm when seconds, tenths, and hundredths of seconds
match
[0–9][0–9]
X
1
1
0
0
Alarm when minutes, seconds, tenths, and hundredths of
seconds match
[0–9][0–9]
X
1
0
0
0
Alarm when hours, minutes, seconds, tenths, and hundredths
of seconds match
[0–9][0–9]
0
0
0
0
0
Alarm when date, hours, minutes, seconds, tenths, and
hundredths of seconds match
[0–9][0–9]
1
0
0
0
0
Alarm when day, hours, minutes, seconds, tenths, and
hundredths of seconds match
Table 3. Alarm Mask Bits
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1392U-18+ | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
| DS1392U-3 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
| DS1392U-3+ | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
| DS1392U-33 | 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 |
| DS1392U-33+ | 功能描述:实时时钟 Low-V SPI/3-Wire With Trickle Charger 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 |
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