- 您現在的位置：買賣IC網 > PDF目錄379177 > DS1215 Phantom Time Chip PDF資料下載
參數資料
| 型號： | DS1215 |
| 英文描述： | Phantom Time Chip |
| 中文描述： | 幻影時鐘芯片 |
| 文件頁數： | 3/15頁 |
| 文件大小： | 113K |
| 代理商： | DS1215 |
DS1215
032697 3/15
When the first write cycle is executed, it is compared to
bit 1 of the 64–bit comparison register. If a match is
found, the pointer increments to the next location of the
comparison register and awaits the next write cycle. If a
match is not found, the pointer does not advance and all
subsequent write cycles are ignored. If a read cycle oc-
curs at any time during pattern recognition, the present
sequence is aborted and the comparison register point-
er is reset. Pattern recognition continues for a total of 64
write cycles as described above until all the bits in the
comparison register have been matched. (This bit pat-
tern is shown in Figure 2.) With a correct match for 64
bits, the Time Chip is enabled and data transfer to or
from the timekeeping registers may proceed. The next
64 cycles will cause the Time Chip to either receive data
on D, or transmit data on Q, depending on the level of
OE pin or the WE pin. Cycles to other locations outside
the memory block can be interleaved with CEI cycles
without interrupting the pattern recognition sequence or
data transfer sequence to the Time Chip.
A 32,768 Hz quartz crystal can be directly connected to
the DS1215 via pins 1 and 2 (X1, X2). The crystal se-
lected for use should have a specified load capacitance
(C
L
) of 6 pF. For more information on crystal selection
and crystal layout considerations, please consult
Application Note 58, “Crystal Considerations with Dal-
las Real Time Clocks”.
TIME CHIP COMPARISON REGISTER DEFINITION
Figure 2
7
6
5
4
3
2
1
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
1
0
1
0
1
0
0
0
1
1
0
1
0
1
1
1
0
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
1
0
1
0
1
0
0
0
1
1
0
1
0
1
1
1
0
0
C5
3A
A3
5C
C5
3A
A3
5C
BYTE 0
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTE 6
BYTE 7
VHEX
NOTE:
The pattern recognition in Hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of this pattern being accidentally duplicated
and causing inadvertent entry to the Time Chip are less than 1 in 10
19
.
相關PDF資料 |
PDF描述 |
|---|---|
| DS1216 | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F |
| DS1216B | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F |
| DS1216C | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F |
| DS1216D | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F |
| DS1216E | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS1215G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| DS1215GN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| DS-1215ZJ | 制造商:Hikvision USA 功能描述:Camera Pole Mount Plate7.64In X 4.61In X 3.94In 制造商:HIKVISION 功能描述:CAMERA POLE MOUNT PLATE 7.64IN X 4.61IN X 3.94IN |
| DS1216 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:SmartWatch RAM (DS1216B/C/D/H); SmartWatch ROM (DS1216E/F) |
| DS1216B | 功能描述:存儲器控制器 SmartWatch RAM RoHS:否 制造商:Maxim Integrated |
發(fā)布緊急采購，3分鐘左右您將得到回復。