參數(shù)資料
型號(hào)： ADJD-J823
廠商： Avago Technologies Ltd.
英文描述： Color Management Controller with Integrated RGB Photosensor
中文描述： 色彩管理控制器集成RGB光
文件頁(yè)數(shù)： 11/18頁(yè)
文件大小： 275K
代理商： ADJD-J823
11
Figure 2. START/STOP Condition
S
START condition
P
STOP condition
SDA
SCL
Serial Interface Reference
Description
The programming interface to the ADJD-J823 is a 2-wire serial bus. The bus consists of a serial clock (SCL) and a serial
data (SDA) line. The SDA line is bi-directional on ADJD-J823 and must be connected through a pull-up resistor to the
positive power supply. When the bus is free, both lines are HIGH.
The 2-wire serial bus on ADJD-J823 requires one device to act as a master while all other devices must be slaves. A
master is a device that initiates a data transfer on the bus, generates the clock signal and terminates the data transfer
while a device addressed by the master is called a slave
.
Slaves are identified by unique device addresses.
Both master and slave can act as a transmitter or a receiver but the master controls the direction for data transfer. A
transmitter is a device that sends data to the bus and a receiver is a device that receives data from the bus.
The ADJD-J823 serial bus interface always operates as a slave transceiver with a data transfer rate of up to 100kbit/s.
START/STOP Condition
The master initiates and terminates all serial data transfers. To begin a serial data transfer, the master must send a
unique signal to the bus called a START condition. This is defined as a HIGH to LOW transition on the SDA line while
SCL is HIGH.
The master terminates the serial data transfer by sending another unique signal to the bus called a STOP condition.
This is defined as a LOW to HIGH transition on the SDA line while SCL is HIGH.
The bus is considered to be busy after a START (S) condition. It will be considered free a certain time after the STOP (P)
condition. The bus stays busy if a repeated START (Sr) is sent instead of a STOP condition.
The START and repeated START conditions are functionally identical.
Data Transfer
The master initiates data transfer after a START condition. Data is transferred in bits with the master generating one
clock pulse for each bit sent. For a data bit to be valid, the SDA data line must be stable during the HIGH period of the
SCL clock line. Only during the LOW period of the SCL clock line can the SDA data line change state to either HIGH or
LOW.
Figure 3. Data Bit Transfer
SDA
SCL
Data valid
Data change
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