pca9537dp NXP Semiconductors, pca9537dp Datasheet - Page 5

• Manufacturer Part Number: pca9537dp
• Description: 4-bit I2c And Smbus Low Power I/o Port With Interrupt And Reset
• Manufacturer: NXP Semiconductors

NOTE: At Power-on Reset, all registers return to default values.
Philips Semiconductors
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O3
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 enabled,
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 paths that exist between the
pin and either V
2006 Sep 21
4-bit I
I/O port with interrupt and reset
DD
CONFIGURATION
SHIFT REGISTER
SHIFT REGISTER
SHIFT REGISTER
READ PULSE
2
WRITE PULSE
to a maximum of 5.5 V.
C-bus and SMBus low power
DATA FROM
DATA FROM
DATA FROM
POLARITY
DD
PULSE
WRITE
PULSE
WRITE
or V
SS
.
CONFIGURATION
REGISTER
D
C
K
FF
Q
Q
Figure 3. Simplified schematic of I/O0 to I/O3
REGISTER
C
OUTPUT
D
PORT
K
FF
Q
Q
5
INPUT PORT
INVERSION
POLARITY
REGISTER
REGISTER
C
C
D
D
K
K
FF
FF
Q
Q
Q
Q
Q1
Q2
OUTPUT PORT
REGISTER DATA
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
V
I/O0 TO I/O3
V
TO INT
DD
SS
PCA9537
Product data sheet
SW02325