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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： | 25/26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
8
IDT1339
REV N 060311
Table 4. Alarm Mask Bits
Special-Purpose Registers
The IDT1339 has two additional registers (control and status) that control the RTC, alarms, and square-wave output.
Control Register (0Eh)
Bit 7: Enable Oscillator (EOSC). This bit when set to logic 0 starts the oscillator. When this bit is set to a logic 1,
the oscillator is stopped. This bit is enabled (logic 0) when power is first applied.
Bit 5: Battery-Backed Square-Wave and Interrupt Enable (BBSQI). This bit when set to a logic 1 enables the
square wave or interrupt output when VCC is absent and the IDT1339 is being powered by the VBACKUP pin. When
BBSQI is a logic 0, the SQW/INT pin goes high impedance when VCC falls below the power-fail trip point. This bit is
disabled (logic 0) when power is first applied.
Bits 4 and 3: Rate Select (RS2 and RS1). These bits control the frequency of the square-wave output when the
square wave has been enabled. Table 5 shows the square-wave frequencies that can be selected with the RS bits.
These bits are both set to logic 1 (32 kHz) when power is first applied.
DY/DT
Alarm 1 Register Mask Bits (Bit 7)
Alarm Rate
A1M4
A1M3
A1M2
A1M1
X
1111
Alarm once per second.
X
1110
Alarm when seconds match.
X
1100
Alarm when minutes and seconds match.
X
1000
Alarm when hours, minutes, and seconds match.
0
0000
Alarm when date, hours, minutes, and seconds match.
1
0000
Alarm when day, hours, minutes, and seconds match.
DY/DT
Alarm 2 Register Mask Bits (Bit 7)
Alarm Rate
A2M4
A2M3
A2M2
X
1
Alarm once per minute (00 sec. of every min.).
X
1
0
Alarm when minutes match.
X
1
0
Alarm when hours and minutes match.
0
Alarm when date, hours, and minutes match.
1
0
Alarm when day, hours, and minutes match.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
EOSC
0
BBSQI
RS2
RS1
INTCN
A2IE
A1IE
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