PCA9535 Philips Semiconductors, PCA9535 Datasheet - Page 5

• Manufacturer Part Number: PCA9535
• Description: 16-bit I2C and SMBus/ low power I/O port with interrupt
• Manufacturer: Philips Semiconductors

Philips Semiconductors
SIMPLIFIED SCHEMATIC OF I/Os
NOTE: At Power-on Reset, all registers return to default values.
I/O port
When an I/O is configured as an input, FETs Q1 and Q2 are off,
creating a high impedance input. The input voltage may be raised
above V
If the I/O is configured as an output, then either Q1 or Q2 is on,
depending on the state of the Output Port register. Care should be
exercised if an external voltage is applied to an I/O configured as an
output because of the low impedance path that exists between the
pin and either V
2003 Jun 27
16-bit I
WRITE CONFIGURATION
DD
SHIFT REGISTER
SHIFT REGISTER
SHIFT REGISTER
to a maximum of 5.5 V.
READ PULSE
2
WRITE PULSE
C and SMBus, low power I/O port with interrupt
DATA FROM
DATA FROM
DATA FROM
DD
POLARITY
or V
WRITE
PULSE
PULSE
SS
.
CONFIGURATION
REGISTER
C
D
K
FF
Q
Q
Figure 4. Simplified schematic of I/Os
REGISTER
OUTPUT
C
D
PORT
K
FF
Q
Q
5
INPUT PORT
INVERSION
REGISTER
REGISTER
POLARITY
C
C
D
D
K
K
FF
FF
Q
Q
Q
Q
Q1
Q2
OUTPUT PORT
REGISTER DATA
V
I/O PIN
V
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
DD
SS
TO INT
PCA9535
SU01682
Product data