參數(shù)資料
型號(hào)： DS2404S-001
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Timer or RTC
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO16
封裝： 0.300 INCH, SOIC-16
文件頁(yè)數(shù)： 11/31頁(yè)
文件大小： 1591K
代理商： DS2404S-001
DS2404
19 of 29
Interrupts
If the DS2404 detects an alarm condition, it will automatically set the corresponding alarm flag (CCF,
ITF or RTF) in the Status Register. If the flag’s corresponding interrupt bit ( RST , ITE or RTE ) is enabled
(logic 0) an interrupt condition begins as the alarm goes off. The DS2404 signals the interrupt condition
by pulling the open drain IRQ output low. The interrupt condition ceases when the alarm flags are cleared
(i.e., the interrupt is acknowledged by reading the Status Register, address 200H) or if the corresponding
interrupt enable bit is disabled (set to logic 1).
Interrupts can also be generated on the 1-Wire port. Since communication and interrupt signaling share
the same pin, one has to distinguish between two types of interrupts: spontaneous interrupts, called type
1, and delayed interrupts type 2. Spontaneous interrupts that have not yet occurred need to be (re-) armed
by a reset pulse after all communication on the 1-Wire bus has finished. A single falling slope on the
1-Wire bus will disarm this type of interrupt. If an alarm condition occurs while the device is disarmed, at
first a type 2 interrupt will be produced.
Spontaneous interrupts are signaled by the DS2404 by pulling the data line low for 960 to 3840
μs as the
interrupt condition begins (Figure 12). After this long low pulse a presence pulse will follow. If the alarm
condition occurs just after the master has sent a reset pulse, i.e., during the high or low time of the
presence pulse, the DS2404 will not assert its Interrupt Pulse until the presence pulse is finished
(Figure 13).
If the DS2404 cannot assert a spontaneous interrupt, either because the data line was not pulled high,
communication was in progress, or the interrupt was not armed, it will extend the next reset pulse to a
total length of 960 to 3840
μs (delayed interrupt). If the alarm condition occurs during the reset low time
of the reset pulse, the DS2404 will immediately assert its interrupt pulse; thus the total low time of the
pulse can be extended up to 4800
μs (Figure 14). If a DS2404 with a not previously signaled alarm
detects a power-on cycle on the 1-Wire bus, it will send a presence pulse and wait for the reset pulse sent
by the master to extend it and to subsequently issue a presence pulse (Figure 15). As long as an interrupt
has not been acknowledged by the master, the DS2404 will continue sending interrupt pulses.
The interrupt signaling discussed so far is valid for the first opportunity the device has to signal an
interrupt. It is not required for the master to acknowledge an interrupt immediately. If an interrupt is not
acknowledged, the DS2404 will continue signaling the interrupt with every reset pulse. To do so, DS2404
devices of Revision B4 (earlier production parts) will always use the waveform of the Type 2 Interrupt
(Figure 14). Devices of Revision B5 (current production) will either use the waveform of the Type 2
Interrupt (Figure 14) or the waveform of the Type 1A Interrupt (Figure 13). The waveform of the Type 2
Interrupt will be observed after a communication to a device other than the interrupting one; after
successful communication to the interrupting device (without acknowledging the interrupt) the waveform
of the Type 1A Interrupt will be found. The revision code of the DS2404 is appended to the
manufacturing date code, which is printed on the top of the package right below the part number.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2404S-001/T&R 制造商:Maxim Integrated Products 功能描述:ECONORAM/TIME, SOIC16-TRL (GENERIC) - Tape and Reel
DS2404S-001+ 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 512BYTE 16SOIC - Rail/Tube
DS2404S-001+T&R 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 512BYTE 16SOIC - Tape and Reel
DS2404S-C01 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC
DS2405 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59
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