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參數(shù)資料
| 型號： | DS1337U |
| 英文描述： | Serial Real-Time Clock |
| 中文描述： | 串行實(shí)時(shí)時(shí)鐘 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 364K |
| 代理商： | DS1337U |
DS1337
alarm 2 registers activates the SQW/
INTB
pin (provided that the alarm is enabled). When the INTCN bit is set to
logic 0, a match between the timekeeping registers and either alarm 1 or alarm 2 registers activates the
INTA
pin
(provided that the alarms are enabled). In this configuration, a square wave is output on the SQW/
INTB
pin. This
bit is set to logic 0 when power is first applied.
A1IE, Alarm 1 Interrupt Enable.
When set to logic 1, this bit permits the alarm 1 flag (A1F) bit in the status
register to assert
INTA
. When the A1IE bit is set to logic 0, the A1F bit does not initiate the
INTA
signal. The
A1IE bit is disabled (logic 0) when power is first applied.
A2IE, Alarm 2 Interrupt Enable.
When set to logic 1, this bit permits the alarm 2 flag (A2F) bit in the status
register to assert
INTA
(when INTCN = 0) or to assert SQW/
INTB
(when INTCN = 1). When the A2IE bit 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.
Status Register (0Fh)
10 of 13
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OSF
0
0
0
0
0
A2F
A1F
OSF, Oscillator Stop Flag.
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 calendar data. This bit is set to logic 1
anytime that 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 present on V
CC
is 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.
A1F, Alarm 1 Flag.
A logic 1 in the alarm 1 flag bit indicates that the time matched the alarm 1 registers. If the
A1IE bit is also logic 1, the
INTA
pin goes low. 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.
A2F, Alarm 2 Flag.
A logic 1 in the alarm 2 flag bit indicates that the time matched the alarm 2 registers. This
flag can be used to generate an interrupt on either
INTA
or SQW/
INTB
depending on the status of the INTCN bit
in the control register. If the INTCN bit is set to logic 0 and A2F is at logic 1 (and A2IE bit is also logic 1), the
INTA
pin goes low. If the INTCN bit is set to logic 1 and A2F is logic 1 (and A2IE bit is also logic 1), the
SQW/
INTB
pin goes low. 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.
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| DS1339C-33 | TRANS NPN 160V 350MW SMD SOT-23 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1337U/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC SERIAL 2WIRE LP 8-USOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C Serial RTC |
| DS1337U/T&R | 功能描述:實(shí)時(shí)時(shí)鐘 I2C Serial RTC 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1337U+ | 功能描述:實(shí)時(shí)時(shí)鐘 I2C Serial RTC 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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 |
| DS1337U+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
| DS1337U+T&R | 制造商:Maxim Integrated Products 功能描述:SERIAL RTC 8PIN USOP TRL LEADFREE 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC SERIAL 2WIRE LP 8-USOP 制造商:Maxim Integrated Products 功能描述:Real Time Clock I2C Serial RTC |
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