PCA9538APWJ NXP Semiconductors, PCA9538APWJ Datasheet - Page 7

• Manufacturer Part Number: PCA9538APWJ
• Description: Interface - I/O Expanders 8bit I2C IO Port
• Manufacturer: NXP Semiconductors

Specifications of PCA9538APWJ

• Rohs: yes
• Maximum Operating Frequency: 100 kHz
• Operating Supply Voltage: 1.65 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-16
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders

NXP Semiconductors
PCA9538A
Product data sheet
6.4.4 Configuration register (03h)
6.5 I/O port
The Configuration register (register 3) configures the direction of the I/O pins. If a bit in this
register is set to 1, the corresponding port pin is enabled as a high-impedance input. If a
bit in this register is cleared to 0, the corresponding port pin is enabled as an output.
Table 9.
When an I/O is configured as an input, FETs Q1 and Q2 are off, which creates a
high-impedance input. The input voltage may be raised above V
If the I/O is configured as an output, Q1 or Q2 is enabled, depending on the state of the
Output port register. In this case, there are low-impedance paths between the I/O pin and
either V
recommended levels for proper operation.
Bit
Symbol
Default
Fig 6.
configuration
write polarity
shift register
shift register
shift register
write pulse
read pulse
data from
data from
data from
pulse
pulse
write
DD
On power-up or reset, all registers return to default values.
Simplified schematic of the I/Os (P0 to P7)
Configuration register (address 03h)
or V
C7
7
1
configuration
register
SS
D
CK
All information provided in this document is subject to legal disclaimers.
. The external voltage applied to this I/O pin should not exceed the
FF
Q
Q
Rev. 1 — 28 September 2012
C6
6
1
Low-voltage 8-bit I
output port
register
D
CK
FF
C5
5
1
Q
input port
register
polarity
inversion
register
D
CK
D
CK
C4
4
1
FF
FF
2
Q
Q
C-bus I/O port with interrupt and reset
C3
3
1
Q1
Q2
C2
DD
2
1
PCA9538A
to a maximum of 5.5 V.
ESD
protection
diode
© NXP B.V. 2012. All rights reserved.
C1
1
1
output port
register data
V
P0 to P7
V
input port
register data
to INT
polarity
inversion
register data
DD
SS
002aah423
C0
0
1
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