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參數(shù)資料
| 型號： | 1339-2DVGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 3 MM, ROHS COMPLIANT, MSOP-8 |
| 文件頁數(shù)： | 26/26頁 |
| 文件大?。?/td> | 330K |
| 代理商： | 1339-2DVGI |
IDT1339
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
RTC
IDT
REAL-TIME CLOCK WITH SERIAL I2C INTERFACE
9
IDT1339
REV N 060311
Table 5. SQW/INT Output
Bit 2: Interrupt Control (INTCN). This bit controls the relationship between the two alarms and the interrupt output
pins. When the INTCN bit is set to logic 1, a match between the timekeeping registers and the alarm 1 or alarm 2
registers activate the SQW/INT pin (provided that the alarm is enabled). When the INTCN bit is set to logic 0, a
square wave is output on the SQW/INT pin. This bit is set to logic 0 when power is first applied.
Bit 1: Alarm 2 Interrupt Enable (A2IE). When set to a logic 1, this bit permits the Alarm 2 Flag (A2F) bit in the
status register to assert SQW/INT (when INTCN = 1). When the A2IE bit is set to logic 0 or INTCN is set to logic 0,
the A2F bit does not initiate an interrupt signal. The A2IE bit is disabled (logic 0) when power is first applied.
Bit 0: Alarm 1 Interrupt Enable (A1IE). When set to logic 1, this bit permits the Alarm 1 Flag (A1F) bit in the status
register to assert SQW/INT (when INTCN = 1). When the A1IE bit is set to logic 0 or INTCN is set to logic 0, the A1F
bit does not initiate an interrupt signal. The A1IE bit is disabled (logic 0) when power is first applied.
Status Register (0Fh)
Bit 7: Oscillator Stop Flag (OSF). A logic 1 in this bit indicates that the oscillator either is stopped or was stopped
for some period of time and may be used to judge the validity of the clock and date data. This bit is edge triggered
and is set to logic 1 when the oscillator stops. The following are examples of conditions that can cause the OSF bit
to be set:
1) The first time power is applied.
2) The voltage on both VCC and VBACKUP are insufficient to support oscillation.
3) The EOSC bit is turned off.
4) External influences on the crystal (e.g., noise, leakage, etc.).
This bit remains at logic 1 until written to logic 0. This bit can only be written to a logic 0.
Bit 1: Alarm 2 Flag (A2F). A logic 1 in the Alarm 2 Flag bit indicates that the time matched the alarm 2 registers. If
the A2IE bit is a logic 1 and the INTCN bit is set to a logic 1, the SQW/INT pin is also asserted. A2F is cleared when
written to logic 0. This bit can only be written to logic 0. Attempting to write to logic 1 leaves the value unchanged.
Bit 0: Alarm 1 Flag (A1F). A logic 1 in the Alarm 1 Flag bit indicates that the time matched the alarm 1 registers. If
the A1IE bit is a logic 1 and the INTCN bit is set to a logic 1, the SQW/INT pin is also asserted. A1F is cleared when
written to logic 0. This bit can only be written to logic 0. Attempting to write to logic 1 leaves the value unchanged.
INTCN
RS2
RS1
SQW/INT Output
A2IE
A1IE
00
0
1 Hz
X
0
1
4.096 kHz
X
0
1
0
8.192 kHz
X
0
1
32.768 kHz
X
1X
X
A1F
01
1X
X
A2F
10
1X
X
A2F + A1F
11
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OSF
00000
A2F
A1F
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| 1339-2DVGI8 | 功能描述:實時時鐘 RTC BASE RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝: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:膠帶 1339 TAPE 3/4X60YDS BULK 3" PAPER CORE RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
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