參數(shù)資料
型號(hào)： PCA8575
廠商： NXP Semiconductors N.V.
英文描述： Remote 16-bit I/O expander for I2C-bus with interrupt
中文描述： 遠(yuǎn)程16位I / O擴(kuò)展I2C總線的中斷
文件頁(yè)數(shù)： 12/30頁(yè)
文件大?。?/td> 168K
代理商： PCA8575
PCA8575_1
NXP B.V. 2006. All rights reserved.
Objective data sheet
Rev. 01 — 30 November 2006
12 of 30
NXP Semiconductors
PCA8575
Remote 16-bit I/O expander for I
2
C-bus with interrupt
9.
Characteristics of the I
2
C-bus
The I
2
C-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.
9.1 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 15
).
9.1.1
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 16
.)
9.2 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 17
).
Fig 15. Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig 16. Definition of START and STOP conditions
mba608
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
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PCA8575BS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Remote 16-bit I/O expander for I2C-bus with interrupt
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