PCA9555APW,118 NXP Semiconductors, PCA9555APW,118 Datasheet - Page 6

• Manufacturer Part Number: PCA9555APW,118
• Description: Interface - I/O Expanders 16b I2C BUS INTERUPT
• Manufacturer: NXP Semiconductors

Specifications of PCA9555APW,118

• 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-24
• Operating Current: 160 mA
• Output Current: 25 mA
• Power Dissipation: 200 mW
• Product Type: I/O Expanders
• Factory Pack Quantity: 2500

NXP Semiconductors
PCA9555A
Product data sheet
6.2.2 Input port register pair (00h, 01h)
6.2.3 Output port register pair (02h, 03h)
The Input port registers (registers 0 and 1) reflect the incoming logic levels of the pins,
regardless of whether the pin is defined as an input or an output by the Configuration
register. The Input port registers are read only; writes to these registers have no effect.
The default value ‘X’ is determined by the externally applied logic level. An Input port
register read operation is performed as described in
registers”.
Table 5.
Table 6.
The Output port registers (registers 2 and 3) show the outgoing logic levels of the pins
defined as outputs by the Configuration register. Bit values in these registers have no
effect on pins defined as inputs. In turn, reads from these registers reflect the value that
was written to these registers, not the actual pin value. A register pair write is described in
Section 7.1
Table 7.
Table 8.
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
Input port 0 register (address 00h)
Input port 1 register (address 01h)
Output port 0 register (address 02h)
Output port 1 register (address 03h)
and a register pair read is described in
O0.7
O1.7
I0.7
I1.7
X
X
7
7
7
1
7
1
All information provided in this document is subject to legal disclaimers.
Low-voltage 16-bit I
Rev. 1 — 11 September 2012
O0.6
O1.6
I0.6
I1.6
X
X
6
6
6
1
6
1
O0.5
O1.5
I0.5
I1.5
X
X
5
5
5
1
5
1
2
C-bus I/O port with interrupt and weak pull-up
O0.4
O1.4
I0.4
I1.4
X
X
4
4
4
1
4
1
Section
O0.3
O1.3
Section 7.2 “Reading the port
I0.3
I1.3
X
X
3
3
3
1
3
1
7.2.
O0.2
O1.2
I0.2
I1.2
X
X
2
2
2
1
2
1
PCA9555A
© NXP B.V. 2012. All rights reserved.
O0.1
O1.1
I0.1
I1.1
X
X
1
1
1
1
1
1
O0.0
O1.0
I0.0
I1.0
X
X
0
0
0
1
0
1
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