PCA9543D PHILIPS [NXP Semiconductors], PCA9543D Datasheet - Page 7
![no-image](/images/no-image-200.jpg)
PCA9543D
Manufacturer Part Number
PCA9543D
Description
2-channel I2C switch with interrupt logic and reset
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.PCA9543D.pdf
(15 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PCA9543D
Manufacturer:
PHI
Quantity:
20 000
Philips Semiconductors
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.
2004 Oct 01
2-channel I
BY TRANSMITTER
DATA OUTPUT
SDA
2
DATA OUTPUT
BY RECEIVER
C switch with interrupt logic and reset
SCL FROM
SDA
MASTER
start condition
S
start condition
S
1
START condition
1
1
SLAVE ADDRESS
S
1
1
SLAVE ADDRESS
1
0
Figure 9. Acknowledgement on the I
0
0
0
Figure 10. WRITE Control Register
A1
Figure 11. READ Control Register
1
A1
A0
A0
R/W
0
R/W
1
A
acknowledge
from slave
2
A
acknowledge
from slave
X
7
X
X
CONTROL REGISTER
X
CONTROL REGISTER
not acknowledge
X
INT1
acknowledge
X
INT0
8
X
2
C-bus
X
X
acknowledge
from slave
X
B1
no acknowledge
from master
B1
B0
9
B0
A
last byte
SW00807
NA
P
P
stop condition
clock pulse for
acknowledgement
SW00808
PCA9543
Product data sheet
SW00368