参数资料
型号: PCA9555D/G-T
厂商: NXP Semiconductors
文件页数: 32/34页
文件大小: 0K
描述: IC I/O EXPANDER I2C 16B 24SOIC
标准包装: 1
接口: I²C,SM 总线
输入/输出数: 16
中断输出:
频率 - 时钟: 400kHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
供应商设备封装: 24-SO
包装: 剪切带 (CT)
包括: POR
其它名称: 568-1754-1
PCA9555_8
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 08 — 22 October 2009
7 of 34
NXP Semiconductors
PCA9555
16-bit I2C-bus and SMBus I/O port with interrupt
6.2.2 Registers 0 and 1: Input port registers
This register is an input-only port. It reects the incoming logic levels of the pins,
regardless of whether the pin is dened as an input or an output by Register 3. Writes to
this register have no effect.
The default value ‘X’ is determined by the externally applied logic level.
6.2.3 Registers 2 and 3: Output port registers
This register is an output-only port. It reects the outgoing logic levels of the pins dened
as outputs by Registers 6 and 7. Bit values in this register have no effect on pins dened
as inputs. In turn, reads from this register reect the value that is in the ip-op controlling
the output selection, not the actual pin value.
6.2.4 Registers 4 and 5: Polarity Inversion registers
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 Input port data polarity is inverted. If a bit in this
register is cleared (written with a ‘0’), the Input port data polarity is retained.
Table 5.
Input port 0 Register
Bit
7
6
5
4
3
2
1
0
Symbol
I0.7
I0.6
I0.5
I0.4
I0.3
I0.2
I0.1
I0.0
Default
XXXXXXXX
Table 6.
Input port 1 register
Bit
7
6
5
4
3
2
1
0
Symbol
I1.7
I1.6
I1.5
I1.4
I1.3
I1.2
I1.1
I1.0
Default
XXXXXXXX
Table 7.
Output port 0 register
Bit
7
6
5
4
3
2
1
0
Symbol
O0.7
O0.6
O0.5
O0.4
O0.3
O0.2
O0.1
O0.0
Default
11111111
Table 8.
Output port 1 register
Bit
7
6
5
4
3
2
1
0
Symbol
O1.7
O1.6
O1.5
O1.4
O1.3
O1.2
O1.1
O1.0
Default
11111111
Table 9.
Polarity Inversion port 0 register
Bit
7
6
5
4
3
2
1
0
Symbol
N0.7
N0.6
N0.5
N0.4
N0.3
N0.2
N0.1
N0.0
Default
00000000
Table 10.
Polarity Inversion port 1 register
Bit
7
6
5
4
3
2
1
0
Symbol
N1.7
N1.6
N1.5
N1.4
N1.3
N1.2
N1.1
N1.0
Default
00000000
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