PCA9501 View Datasheet(PDF) - NXP Semiconductors.
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PCA9501
NXP Semiconductors.
PCA9501 Datasheet PDF : 28 Pages
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NXP Semiconductors
PCA9501
8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM
7.2 Control register
The PCA9501 contains a single 8-bit register called the Control register, which can be
written and read via the I2C-bus. This register is sent after a successful acknowledgment
of the slave address.
It contains the I/O operation information.
7.3 I/O operations
(Refer also to Figure 5.)
Each of the PCA9501's eight I/Os can be independently used as an input or output.
Output data is transmitted to the port by the I/O Write mode (see Figure 7). Input I/O data
is transferred from the port to the microcontroller by the Read mode (see Figure 8).
SCL 1 2 3 4 5 6 7 8 9
slave address (I/O expander)
data to port
data to port
SDA S 0 A5 A4 A3 A2 A1 A0 0 A
DATA 1
A
DATA 2
A
START condition
write to port
data out from port
R/W acknowledge
from slave
Fig 7. I/O Write mode (output)
acknowledge
from slave
acknowledge
from slave
tv(Q)
tv(Q)
DATA 1 VALID
DATA 2 VALID
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SCL 1 2 3 4 5 6 7 8 9
slave address (I/O expander)
SDA S 0 A5 A4 A3 A2 A1 A0 1 A
data from port
DATA 1
read from
port
data into
port
INT
START condition
R/W acknowledge
from slave
DATA 1
tv(INT)
th(D)
DATA 2
DATA 3
tsu(D)
Fig 8. I/O Read mode (input)
data from port
A
DATA 4
acknowledge
from master
DATA 4
trst(INT)
no acknowledge
from master
1P
STOP
condition
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PCA9501_4
Product data sheet
Rev. 04 — 10 February 2009
© NXP B.V. 2009. All rights reserved.
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