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參數(shù)資料
| 型號(hào)： | DS1994L-F5 |
| 英文描述： | 4kb Plus Time Memory iButton |
| 中文描述： | 4KB的另外iButton的時(shí)間內(nèi)存 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 254K |
| 代理商： | DS1994L-F5 |
DS1994
Spontaneous interrupts are signaled by the DS1994 by pulling the data line low for 960 s to 3840 s as
the interrupt condition begins (Figure 12). After this long low pulse, a presence pulse follows. 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 DS1994 does not assert its interrupt pulse until the presence pulse is finished (Figure
13).
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If the DS1994 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 extends the next reset pulse to a total
length of 960 s to 3840 s (delayed interrupt). If the alarm condition occurs during the reset low time of
the reset pulse, the DS1994 immediately asserts its interrupt pulse; thus, the total low time of the pulse
can be extended up to 4800 s (Figure 14). If a DS1994 with a not previously signaled alarm detects a
power-on cycle on the 1-Wire bus, it sends a presence pulse and waits 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 DS1994 continues 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 DS1994 continues signaling the interrupt with every reset pulse. To do so, the DS1994
either uses 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 is 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 is found.
Figure 12. TYPE 1 INTERRUPT
GND
V
PUP
1-WIRE
BUS
RESET
PULSE
INTERRUPT PULSE
960μs - 3840μs
Note: No communication following
presence pulse, i. e., no falling edge.
Interrupt condition occurs here.
PRESENCE
PULSE
PULSE
PRESENCE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1994 | 4kb Plus Time Memory iButton |
| DS1995 | 16-kbit Memory iButton |
| DS1995L-F5 | 16-kbit Memory iButton |
| DS1996 | 64kbit Memory iButtonTM |
| DS1996L-F5 | 64kbit Memory iButtonTM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1994L-F5+ | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994L-F5-W | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1994-LFS | 制造商: 功能描述: 制造商:undefined 功能描述: |
| DS1995 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:16-kbit Memory iButton |
| DS1995L-F5 | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
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