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參數(shù)資料
| 型號： | PCA9554ADBRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| 封裝： | GREEN, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 37/39頁 |
| 文件大?。?/td> | 985K |
| 代理商： | PCA9554ADBRG4 |
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Device Address
0
1
A1
A2
A0
Slave Address
R/W
Fixed
Hardware
Selectable
Control Register and Command Byte
0
B1
B0
0
www.ti.com........................................................................................................................................... SCPS127D – SEPTEMBER 2006 – REVISED AUGUST 2008
Figure 4 shows the address byte for the PCA9554A.
Figure 4. PCA9554A Address
Address Reference
INPUTS
I2C BUS SLAVE ADDRESS
A2
A1
A0
L
56 (decimal), 38 (hexadecimal)
L
H
57 (decimal), 39 (hexadecimal)
L
H
L
58 (decimal), 3A (hexadecimal)
L
H
59 (decimal), 3B (hexadecimal)
H
L
60 (decimal), 3C (hexadecimal)
H
L
H
61 (decimal), 3D (hexadecimal)
H
L
62 (decimal), 3E (hexadecimal)
H
63 (decimal), 3F (hexadecimal)
The last bit of the slave address defines the operation (read or write) to be performed. When it is high (1), a read
is selected. A low (0) selects a write operation.
Following the successful acknowledgment of the address byte, the bus master sends a command byte that is
stored in the control register in the PCA9554A. Two bits of this command byte state the operation (read or write)
and the internal register (input, output, polarity inversion or configuration) that will be affected. This register can
be written or read through the I2C bus. The command byte is sent only during a write transmission.
Once a command byte has been sent, the register that was addressed continues to be accessed by reads until a
new command byte has been sent.
Figure 5. Control Register Bits
Command Byte
CONTROL REGISTER BITS
COMMAND BYTE
POWER-UP
REGISTER
PROTOCOL
(HEX)
DEFAULT
B1
B0
0
0x00
Input Port
Read byte
XXXX XXXX
0
1
0x01
Output Port
Read/write byte
1111 1111
1
0
0x02
Polarity Inversion
Read/write byte
0000 0000
1
0x03
Configuration
Read/write byte
1111 1111
Copyright 2006–2008, Texas Instruments Incorporated
7
Product Folder Link(s): PCA9554A
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| PCA9554ADWG4 | 功能描述:接口-I/O擴(kuò)展器 Rem 8B I2C and SMBus I/O Expander RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
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