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參數(shù)資料
| 型號(hào)： | ADJD-S313-QR999 |
| 廠商： | Avago Technologies Ltd. |
| 英文描述： | Miniature Surface-Mount RGB Digital Color Sensor |
| 中文描述： | 微型表面貼裝RGB數(shù)字色彩傳感器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 208K |
| 代理商： | ADJD-S313-QR999 |
8
Serial Interface Reference
Description
The programming interface to the ADJD-S313 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-S313 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-S313 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-S313 serial bus interface always operates
as a slave transceiver with a data transfer rate of
up to 100kbit/s.
Figure 1. START/STOP Condition
S
START condition
P
STOP condition
SDA
SCL
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.
SDA
SCL
Data valid
Data change
Figure 2. Data Bit Transfer
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