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參數(shù)資料
| 型號： | PCA9548D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-channel I2C switch with reset |
| 中文描述： | 9548 SERIES, 8 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO24 |
| 封裝： | 7.50 MM, PLASTIC, SOT-137-1, MS-013, SOP-24 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 125K |
| 代理商： | PCA9548D |
Philips Semiconductors
Product data sheet
PCA9548
8-channel I
2
C switch with reset
2004 Sep 30
8
Acknowledge
The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bits
is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter whereas the master generates an
extra acknowledge related clock pulse.
A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an
acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down
the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock
pulse, set-up and hold times must be taken into account.
A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of
the slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition.
DATA OUTPUT
BY TRANSMITTER
SCL FROM
MASTER
SW00368
DATA OUTPUT
BY RECEIVER
1
2
8
9
S
START condition
clock pulse for
acknowledgement
acknowledge
not acknowledge
Figure 9. Acknowledgement on the I
2
C-bus
S
SDA
0
A
A
1
1
1
0
A2
A1 A0
SLAVE ADDRESS
start condition
R/W
acknowledge
from slave
acknowledge
from slave
B0
B4
B1
CONTROL REGISTER
P
SW01032
B5
B2
B6
B3
B7
Figure 10. WRITE control register
SDA
S
1
A
NA
1
1
1
0
A2 A1 A0
start condition
R/W
acknowledge
from slave
B1
CONTROL REGISTER
P
stop condition
last byte
SW01033
SLAVE ADDRESS
no acknowledge
from master
B0
B4
B5
B2
B6
B3
B7
Figure 11. READ control register
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| PCA9548PW | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-channel I2C switch with reset |
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| PCA9549BS,118 | 功能描述:數(shù)字總線開關(guān) IC 8-BIT I2C BUS SWITCH RoHS:否 制造商:Texas Instruments 開關(guān)數(shù)量:24 傳播延遲時間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel |
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