PCA9538PW,112 NXP Semiconductors, PCA9538PW,112 Datasheet - Page 8

• Manufacturer Part Number: PCA9538PW,112
• Description: IC I/O EXPANDER I2C 8B 16TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9538PW,112

• Interface: I²C, SMBus
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Includes: POR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935277419112; PCA9538PW; PCA9538PW

NXP Semiconductors
PCA9538_5
Product data sheet
6.6 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
Fig 6.
configuration
write polarity
shift register
shift register
shift register
write pulse
read pulse
data from
data from
data from
pulse
pulse
write
Remark: At power-on reset, all registers return to default values.
Simplified schematic of IO0 to IO7
configuration
register
D
CK
8-bit I
FF
DD
Q
Q
or V
2
Rev. 05 — 28 May 2009
C-bus and SMBus low power I/O port with interrupt and reset
SS
.
output port
register
D
CK
FF
Q
input port
register
polarity inversion
register
D
CK
D
CK
FF
FF
Q
Q
Q1
DD
to a maximum of 5.5 V.
Q2
PCA9538
© NXP B.V. 2009. All rights reserved.
output port
register data
V
I/O pin
V
input port
register data
to INT
polarity
inversion
register data
DD
SS
002aad723
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