參數(shù)資料
型號: PCA9554PW/Q900,118
廠商: NXP Semiconductors
文件頁數(shù): 33/35頁
文件大?。?/td> 0K
描述: IC I/O EXPANDER I2C 8B 16TSSOP
產(chǎn)品培訓模塊: I²C Bus Fundamentals
特色產(chǎn)品: NXP - I2C Interface
標準包裝: 1
接口: I²C,SM 總線
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時鐘: 400kHz
電源電壓: 2.3 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 16-TSSOP
包裝: 標準包裝
包括: POR
其它名稱: 568-6667-6
PCA9554_9554A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 9 — 19 March 2013
7 of 35
NXP Semiconductors
PCA9554; PCA9554A
8-bit I2C-bus and SMBus I/O port with interrupt
6.1.2 Register 0 - Input Port register
This register is a read-only port. It reflects the incoming logic levels of the pins, regardless
of whether the pin is defined as an input or an output by Register 3. Writes to this register
have no effect.
The default ‘X’ is determined by the externally applied logic level, normally ‘1’ when no
external signal externally applied because of the internal pull-up resistors.
6.1.3 Register 1 - Output Port 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.
Register 0 - Input Port register bit description
Bit
Symbol
Access
Value
Description
7
I7
read only
X
determined by externally applied logic level
6
I6
read only
X
5
I5
read only
X
4
I4
read only
X
3
I3
read only
X
2
I2
read only
X
1
I1
read only
X
0
I0
read only
X
Table 6.
Register 1 - Output Port register bit description
Legend: * default value.
Bit
Symbol
Access
Value
Description
7
O7
R
1*
reflects outgoing logic levels of pins defined as
outputs by Register 3
6O6
R
1*
5O5
R
1*
4O4
R
1*
3O3
R
1*
2O2
R
1*
1O1
R
1*
0O0
R
1*
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