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PCA9537 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. PCA9537
Description  4-bit I2C and SMBus low power I/O port with interrupt and reset
Download  17 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9537 Datasheet(HTML) 5 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9537
4-bit I2C and SMBus low power I/O port
with interrupt and reset
2004 Nov 29
5
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O3
WRITE PULSE
DATA FROM
SHIFT REGISTER
WRITE
CONFIGURATION
PULSE
D
CK
FF
Q
D
CK
Q
FF
D
CK
Q
FF
D
CK
Q
FF
INPUT PORT
REGISTER
POLARITY
INVERSION
REGISTER
OUTPUT
PORT
REGISTER
DATA FROM
SHIFT REGISTER
DATA FROM
SHIFT REGISTER
WRITE
POLARITY
PULSE
CONFIGURATION
REGISTER
OUTPUT PORT
REGISTER DATA
INPUT PORT
REGISTER DATA
POLARITY
REGISTER DATA
READ PULSE
SW02325
Q
Q
Q
Q
TO INT
Q1
Q2
VDD
ESD PROTECTION DIODE
ESD PROTECTION DIODE
I/O0 TO I/O3
VSS
NOTE:
At Power-on Reset, all registers return to default values.
Figure 3. 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 VDD to a maximum of 5.5 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 VDD or VSS.


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