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| 型号： | PCA9506DGG,512 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 6/34页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 40B 56TSSOP |
| 产品培训模块： | I²C Bus Fundamentals |
| 特色产品： | NXP - I2C Interface |
| 标准包装： | 35 |
| 接口： | I²C |
| 输入/输出数： | 40 |
| 中断输出： | 是 |
| 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： | 56-TFSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 56-TSSOP |
| 包装： | 管件 |
| 包括： | POR |
| 产品目录页面： | 824 (CN2011-ZH PDF) |
| 其它名称： | 568-3354-5 935280798512 PCA9506DGG |
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PCA9505_9506
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 4 — 3 August 2010
14 of 34
NXP Semiconductors
PCA9505/06
40-bit I2C-bus I/O port with RESET, OE and INT
8.
Characteristics of the I2C-bus
The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
8.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see Figure 7).
8.1.1 START and STOP conditions
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line while the clock is HIGH is defined as the START condition (S). A
LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition (P) (see Figure 8).
8.2 System configuration
A device generating a message is a ‘transmitter’; a device receiving is the ‘receiver’. The
device that controls the message is the ‘master' and the devices which are controlled by
the master are the ‘slaves' (see Figure 9).
Fig 7.
Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig 8.
Definition of START and STOP conditions
mba608
SDA
SCL
P
STOP condition
S
START condition
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