參數(shù)資料
型號(hào): PCA9500
廠商: NXP Semiconductors N.V.
元件分類: DRAM
英文描述: The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each
中文描述: 該CAT24FC02是一個(gè)2 KB的EEPROM的國內(nèi)256個(gè)8位每字舉辦的串行CMOS
文件頁數(shù): 9/23頁
文件大小: 169K
代理商: PCA9500
Philips Semiconductors
Product data sheet
PCA9500
8-bit I
2
C and SMBus I/O port with 2-kbit EEPROM
2004 Sep 30
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.
Bit transfer
One data bit is transferred during each clock phase. 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 14).
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 15).
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 16).
SDA
SCL
SW00542
DATA LINE
STABLE;
DATA VALID
CHANGE
OF DATA
ALLOWED
Figure 14. Bit transfer
SDA
SCL
P
SDA
SCL
S
SW00543
START CONDITION
STOP CONDITION
Figure 15. Definition of start and stop conditions
SDA
SCL
SW00544
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER/
RECEIVER
Figure 16. System configuration
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