- 您现在的位置：买卖IC网 > PDF目录222090 > 1337DVGI (INTEGRATED DEVICE TECHNOLOGY INC) REAL TIME CLOCK, PDSO8 PDF资料下载
参数资料
| 型号： | 1337DVGI |
| 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： | REAL TIME CLOCK, PDSO8 |
| 封装： | 3 MM, ROHS COMPLIANT, MSOP-8 |
| 文件页数： | 21/24页 |
| 文件大小： | 362K |
| 代理商： | 1337DVGI |
IDT1337
REAL-TIME CLOCK WITH I2C SERIAL INTERFACE
RTC
IDT REAL-TIME CLOCK WITH I2C SERIAL INTERFACE
6
IDT1337
REV J 111009
Clock and Calendar
The time and calendar information is obtained by reading
the appropriate register bytes. The RTC registers are
illustrated in Table 1. The time and calendar are set or
initialized by writing the appropriate register bytes. The
contents 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.
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 register
pointer rolls over to zero.
The countdown chain is reset whenever the seconds
register is written. Write transfers occur 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 1 second. The 1Hz
square-wave output, if enable, transitions high 500ms after
the seconds data transfer, provided the oscillator is already
running.
The IDT1337 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 (20–23 hours). All hours values, including the alarms,
must be reinitialized 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 99–00.
Alarms
The IDT1337 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 INTCN bits of the Control Register) to
operate in two different modes—each alarm can drive its
own separate interrupt output or both alarms can drive a
common interrupt output. Bit 7 of each of the
time-of-day/date alarm registers are mask bits (Table 1).
When all of the mask bits for each alarm are logic 0, an
alarm only occurs when the values in the timekeeping
registers 00h–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 2 (Alarm Mask Bits table) 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.
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, the alarm condition
activates one of the interrupt output (INTA or SQW/INTB)
signals. The match is tested on the once-per-second update
of the time and date registers.
相关PDF资料 |
PDF描述 |
|---|---|
| 1338-31DCGI | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 1339-2DVGI | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 1339-31DCGI8 | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 13715-806-XTD | 300 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 1374610-3 | INTERCONNECTION DEVICE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 1337DVGI8 | 制造商:Integrated Device Technology Inc 功能描述:REAL TIME CLOCK SERL 8TSSOP - Tape and Reel |
| 1337G0 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
| 1337G1 | 功能描述:重负荷电源连接器 PCB45 HORIZ (TOP) RA LP CONT. RoHS:否 制造商:Hirose Connector 系列:PS2 产品类型:Connectors 位置/触点数量: 端接类型:Crimp 触点材料: 触点电镀:Gold 电压额定值: 电流额定值:300 A 附件类型: |
| 1337G2 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Peripheral IC |
| 1337GCSRI | 功能描述:实时时钟 实时时钟 with Embedded Crystal 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 |
发布紧急采购，3分钟左右您将得到回复。