PCA6416A NXP [NXP Semiconductors], PCA6416A Datasheet - Page 8

• Manufacturer Part Number: PCA6416A
• Description: Low-voltage translating 16-bit I2C-bus/SMBus I/O expander
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA6416A
Product data sheet
7.4.1 Input port registers (00h, 01h)
7.4.2 Output port registers (02h, 03h)
7.4 Register descriptions
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
Table 7.
Table 8.
The Output port registers (registers 2 and 3) shows 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 8.1
Table 9.
Table 10.
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.
Rev. 1 — 11 September 2012
O0.6
O1.6
I0.6
I1.6
X
X
6
6
6
1
6
1
Low-voltage translating 16-bit I
O0.5
O1.5
I0.5
I1.5
X
X
5
5
5
1
5
1
O0.4
O1.4
I0.4
I1.4
X
X
4
4
4
1
4
1
Section
O0.3
O1.3
Section
I0.3
I1.3
X
X
3
3
3
1
3
1
8.2.
2
C-bus/SMBus I/O expander
8.2.
O0.2
O1.2
I0.2
I1.2
X
X
2
2
2
1
2
1
PCA6416A
© 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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