PCA9538PW,112 NXP Semiconductors, PCA9538PW,112 Datasheet - Page 6

• 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
6.2.3 Register 1 - Output Port register
6.2.4 Register 2 - Polarity Inversion register
This register reflects the outgoing logic levels of the pins defined as outputs by Register 3.
Bit values in this register have no effect on pins defined as inputs. Reads from this register
return the value that is in the flip-flop controlling the output selection, not the actual pin
value.
Table 5.
Legend: * default value.
This register allows the user to invert the polarity of the Input Port register data. If a bit in
this register is set (written with 1), the corresponding Input Port data is inverted. If a bit in
this register is cleared (written with a 0), the Input Port data polarity is retained.
Table 6.
Legend: * default value.
Bit
7
6
5
4
3
2
1
0
Bit
7
6
5
4
3
2
1
0
Symbol
O7
O6
O5
O4
O3
O2
O1
O0
Symbol
N7
N6
N5
N4
N3
N2
N1
N0
Register 1 - Output Port register bit description
Register 2 - Polarity Inversion register bit description
8-bit I
Access
R
R
R
R
R
R
R
R
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
2
Rev. 05 — 28 May 2009
C-bus and SMBus low power I/O port with interrupt and reset
Value
1*
1*
1*
1*
1*
1*
1*
1*
Value
0*
0*
0*
0*
0*
0*
0*
0*
Description
reflects outgoing logic levels of pins defined as outputs
by Register 3
Description
inverts polarity of Input Port register data
0 = Input Port register data retained (default value)
1 = Input Port register data inverted
PCA9538
© NXP B.V. 2009. All rights reserved.
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