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參數(shù)資料
| 型號： | PCA9574PW,112 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 32/33頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16TSSOP |
| 標準包裝： | 96 |
| 接口： | I²C，SM 總線 |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 400kHz |
| 電源電壓： | 1.1 V ~ 3.6 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： | 帶卷 (TR) |
| 包括： | POR |
| 其它名稱： | 935285149112 PCA9574PW PCA9574PW-ND |
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PCA9574
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 25 April 2012
8 of 33
NXP Semiconductors
PCA9574
8-bit I2C-bus and SMBus, level translating, low volage GPIO
7.5 Reading the port registers
In order to read data from the PCA9574, the bus master must first send the PCA9574
address with the least significant bit set to a logic 0 (see Figure 6 for device address). The
command byte is sent after the address and determines which register will be accessed.
After a restart, the device address is sent again but this time, the least significant bit is set
to logic 1. Data from the register defined by the command byte will then be sent by the
PCA9574. Data is clocked into the register on the falling edge of the acknowledge clock
pulse. After the first byte is read, additional bytes may be read using the auto-increment
feature.
7.5.1 Register 0 - Input port register
This register is read-only. It reflects the incoming logic levels of the pins, regardless of
whether the pin is defined as an input or an output by the Configuration register. Writes to
this register will be acknowledged but will have no effect.
The default ‘X’ is determined by the externally applied logic level.
7.5.2 Register 1 - Polarity inversion register
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 corresponding Input port data is inverted. If a bit in
this register is cleared (written with a ‘0’), the Input port data polarity is retained.
Table 5.
Register 0 - Input port register (address 00h) bit description
Bit
Symbol
Access
Value
Description
7
I0.7
read only
X
determined by externally applied logic level
6
I0.6
read only
X
5
I0.5
read only
X
4
I0.4
read only
X
3
I0.3
read only
X
2
I0.2
read only
X
1
I0.1
read only
X
0
I0.0
read only
X
Table 6.
Register 1 - Polarity inversion register (address 01h) bit description
Legend: * default value.
Bit
Symbol
Access
Value
Description
7
N0.7
R/W
0*
inverts polarity of Input port register data
0 = Input port register data retained (default value)
1 = Input port register data inverted
6N0.6
R/W
0*
5N0.5
R/W
0*
4N0.4
R/W
0*
3N0.3
R/W
0*
2N0.2
R/W
0*
1N0.1
R/W
0*
0N0.0
R/W
0*
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9574PW-T | 功能描述:轉換 - 電壓電平 8-BIT I2C-BUS/SMBUS GPIO TRANS RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MLF-8 |
| PCA9575HF,118 | 功能描述:I2C 接口集成電路 16-BIT I2C-BUS SMBus LW Voltage GPIO RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16 |
| PCA9575HF118 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9575PW1,118 | 功能描述:I2C 接口集成電路 I2C Bus/ SMBus Level Translating 24-Pin RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16 |
| PCA9575PW2,118 | 功能描述:I2C 接口集成電路 I2C Bus/ SMBus Level Translating 28-Pin RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16 |
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