- 您现在的位置：买卖IC网 > PDF目录222090 > 1339-2DVGI (INTEGRATED DEVICE TECHNOLOGY INC) 1 TIMER(S), REAL TIME CLOCK, PDSO8 PDF资料下载
参数资料
| 型号： | 1339-2DVGI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 3 MM, ROHS COMPLIANT, MSOP-8 |
| 文件页数： | 24/26页 |
| 文件大小： | 330K |
| 代理商： | 1339-2DVGI |
IDT1339
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
RTC
IDT
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
7
IDT1339
REV N 060311
Time and Date Operation
The time and date information is obtained by reading the
appropriate register bytes. Table 3 shows the RTC registers.
The time and date are set or initialized by writing the
appropriate register bytes. The contents of the time and
date registers are in the BCD format. The IDT1339 can be
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). All hours values, including the alarms, must be
re-entered whenever the 12/24-hour mode bit is changed.
The century bit (bit 7 of the month register) is toggled when
the years register overflows from 99 to 00. 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.
When reading or writing the time and date registers,
secondary (user) buffers are used to prevent errors when
the internal registers update. When reading the time and
date registers, the user buffers are synchronized to the
internal registers on any start or stop, and when the address
pointer rolls over to zero. The countdown chain is reset
whenever the seconds register is written. Write transfers
occurs on the acknowledge pulse from the device. To avoid
rollover issues, once the countdown chain is reset, the
remaining time and date registers must be written within one
second. If enabled, the 1 Hz square-wave output transitions
high 500 ms after the seconds data transfer, provided the
oscillator is already running.
Alarms
The IDT1339 contains two time of day/date alarms. Alarm 1
can be set by writing to registers 07h to 0Ah. Alarm 2 can be
set by writing to registers 0Bh to 0Dh. The alarms can be
programmed (by the Alarm Enable and INTCN bits of the
Control Register) to activate the SQW/INT output on an
alarm match condition. Bit 7 of each of the time of day/date
alarm registers are mask bits (Table 4). 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 4 shows the possible
settings. Configurations not listed in the table result in
illogical operation.
The DY/DT bits (bit 6 of the alarm day/date registers) control
whether the alarm value stored in bits 0 to 5 of that register
reflects the day of the week or the date of the month. If
DY/DT is written to a logic 0, the alarm is the result of a
match with date of the month. If DY/DT is written to a logic
1, the alarm is the result of a match with day of the week.
The device checks for an alarm match once per second.
When the RTC register values match alarm register
settings, the corresponding Alarm Flag ‘A1F’ or ‘A2F’ bit is
set to logic 1. If the corresponding Alarm Interrupt Enable
‘A1IE’ or ‘A2IE’ is also set to logic 1 and the INTCN bit is set
to logic 1, the alarm condition activates the SQW/INT signal.
If the BBSQI bit is set to 1, the INT output activates while the
part is being powered by VBACKUP. The alarm output
remains active until the alarm flag is cleared by the user.
相关PDF资料 |
PDF描述 |
|---|---|
| 1339-31DCGI8 | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 13715-806-XTD | 300 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 1374610-3 | INTERCONNECTION DEVICE |
| 1376137-1 | POWER CONNECTOR |
| 1380B-8 | BRASS, GOLD FINISH, PCB TERMINAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 1339-2DVGI8 | 功能描述:实时时钟 RTC BASE 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 |
| 13393 | 制造商:Desco Industries Inc 功能描述:BG STSHLD MTL-IN 16''X30'' 100EA |
| 1339-3/4"x60yd | 功能描述:胶带 1339 TAPE 3/4X60YDS BULK 3" PAPER CORE RoHS:否 制造商:3M Electronic Specialty 产品:Tapes 类型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 颜色: 材料:Copper Foil 宽度:1 in x 18 yds |
| 1339-3/4INX60YDS | 制造商:3M Electronic Products Division 功能描述:80008005862 |
| 1339-3/8"x60yd | 功能描述:胶带 TAPE 3/8 INX60YD BULK 3"CORE RoHS:否 制造商:3M Electronic Specialty 产品:Tapes 类型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 颜色: 材料:Copper Foil 宽度:1 in x 18 yds |
发布紧急采购，3分钟左右您将得到回复。