- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379181 > DS1994 4kb Plus Time Memory iButton PDF資料下載
參數(shù)資料
| 型號(hào)： | DS1994 |
| 英文描述： | 4kb Plus Time Memory iButton |
| 中文描述： | 4K位、帶有時(shí)鐘的存儲(chǔ)器iButton® |
| 文件頁數(shù)： | 6/22頁 |
| 文件大?。?/td> | 254K |
| 代理商： | DS1994 |
DS1994
Interval Timer
The interval timer is a 5-Byte binary counter. When enabled, it is incremented 256 times per second. The
least significant Byte is a count of fractional seconds. The interval timer can accumulate 136 years of
seconds before rolling over. The interval timer has two modes of operation that are selected by the
AUTO/MAN bit in the control register. In the auto mode, the interval timer begins counting after the data
line has been high for a period of time determined by the DSEL bit in the control register. Similarly, the
interval timer stops counting after the data line has been low for a period of time determined by the DSEL
bit. In the manual mode, time accumulation is controlled by the STOP/START bit in the control register.
6 of 22
NOTE: For auto mode operation, the high level on the data line must be greater than or equal to 2.1V.
Cycle Counter
The cycle counter is a 4-Byte binary counter. It increments after the falling edge of the data line if the
appropriate data line timing has been met. This timing is selected by the DSEL bit in the control register.
(See the
Status/Control
section).
NOTE:
For cycle counter operation, the high level on the data line must be greater than or equal to 2.1V.
Alarm Registers
The alarm registers for the real-time clock, interval timer, and cycle counter all operate in the same
manner. When the value of a given counter equals the value in its associated alarm register, the
appropriate flag bit is set in the status register. If the corresponding interrupt enable bit in the status
register is set, an interrupt is generated. If a counter and its associated alarm register are write protected
when an alarm occurs, access to the device becomes limited. (See the
Status/Control
,
Interrupts
, and
Programmable Expiration
sections.)
STATUS/CONTROL REGISTERS
The status and control registers are the first two Bytes of page 16 (see Figure 4).
Status Register
7
6
5
4
3
2
1
0
X
X
CCE
ITE
RTE
CCF
ITF
RTF
0200h
DON’T CARE BITS
READ ONLY
0
RTF
Real-time clock alarm flag
1
ITF
Interval timer alarm flag
2
CCF
Cycle counter alarm flag
When a given alarm occurs, the corresponding alarm flag is set to a logic 1. The alarm flag is cleared by
reading the status register.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1995 | 16-kbit Memory iButton |
| DS1995L-F5 | 16-kbit Memory iButton |
| DS1996 | 64kbit Memory iButtonTM |
| DS1996L-F5 | 64kbit Memory iButtonTM |
| DS2004SF24 | Rectifier Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1994-LF5 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| 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+ | 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: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。