Figure 13, Pca9665, Nxp semiconductors – NXP Semiconductors PCA9665 User Manual
Page 41
PCA9665_2
© NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 7 December 2006
41 of 91
NXP Semiconductors
PCA9665
Fm+ parallel bus to I
2
C-bus controller
If the LB bit is reset (logic 0), the PCA9665 will return an acknowledge for all the bytes that
will be received. The maximum number of bytes that are received in a single sequence is
defined by BC[6:0] in I2CCOUNT register as shown in
.
If the LB bit is set (logic 1) during a transfer, the PCA9665 will return a not acknowledge
(logic 1) on SDA after receiving the last byte. If the AA bit is reset, the I
2
C-bus state
machine does not respond to its own slave address. However, the I
2
C-bus is still
monitored and address recognition may be resumed at any time by setting AA. This
means that the AA bit may be used to temporarily isolate the PCA9665 from the I
2
C-bus.
(1) See
(2) Defined state when the number of bytes received is equal to the value in I2CCOUNT register and LB = 0.
(3) Defined state when the number of bytes received is equal to the value in I2CCOUNT register and LB = 1.
(4) Number of bytes received is lower than I2CCOUNT.
Fig 13. Format and states in the Slave Receiver Buffered mode (MODE = 1)
S
SLA
W
A
DATA
A
P or S
80h
A0h
A
68h
002aab661
reception of
own slave address
and one or more
data bytes;
all are Acknowledged
last data byte received is
Not Acknowledged
arbitration lost as MST and
addressed as slave
DATA
A
80h
P or S
F8h
A
88h
on STOP
P or S
F8h
on STOP
GENERAL
CALL = 00h
A
DATA
A
P or S
E0h
A0h
A
D8h
DATA
A
E0h
P or S
A
E8h
reception of the
General Call address
and one or more
data bytes
last data byte received is
Not Acknowledged
arbitration lost as MST and
addressed as slave by
General Call
S
F8h
on STOP
W
(2)
(2)
(3)
(2)
(2)
(3)
P or S
F8h
on STOP
A
DATA
A
DATA
60h
D0h
n
This number (contained in I2CSTA) corresponds
to a defined state of the I
2
C-bus.
(1)
DATA
A
any number of data bytes and
their associated Acknowledge bits
from master to slave
from slave to master
(4)
(4)