pca8575 NXP Semiconductors, pca8575 Datasheet - Page 13
![no-image](/images/manufacturer_photos/0/4/487/nxp_semiconductors_sml.jpg)
pca8575
Manufacturer Part Number
pca8575
Description
Remote 16-bit I/o Expander For I2c-bus With Interrupt
Manufacturer
NXP Semiconductors
Datasheet
1.PCA8575.pdf
(30 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
pca8575BQ
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Company:
Part Number:
pca8575BS
Manufacturer:
NXP
Quantity:
585
Part Number:
pca8575BS
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Company:
Part Number:
pca8575D
Manufacturer:
NXP Semiconductors
Quantity:
1 803
Company:
Part Number:
pca8575D
Manufacturer:
NXP
Quantity:
2 233
Part Number:
pca8575D
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Company:
Part Number:
pca8575DB
Manufacturer:
NXP
Quantity:
398
Part Number:
pca8575DB
Manufacturer:
NXP/恩智浦
Quantity:
20 000
NXP Semiconductors
PCA8575_2
Product data sheet
Fig 17. System configuration
SDA
SCL
TRANSMITTER/
RECEIVER
MASTER
9.3 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.
Fig 18. Acknowledgement on the I
RECEIVER
SLAVE
SCL from master
by transmitter
data output
by receiver
data output
TRANSMITTER/
Rev. 02 — 21 March 2007
RECEIVER
condition
START
SLAVE
S
Remote 16-bit I/O expander for I
2
C-bus
TRANSMITTER
1
MASTER
2
TRANSMITTER/
RECEIVER
MASTER
acknowledgement
not acknowledge
SLAVE
clock pulse for
acknowledge
8
2
C-bus with interrupt
MULTIPLEXER
PCA8575
© NXP B.V. 2007. All rights reserved.
002aaa987
I
2
9
C-BUS
002aaa966
13 of 30