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PCF8570T/F5,518 数据手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
存储芯片
封装:
SOIC-8
描述:
NXP PCF8570T/F5,518 存储器, SRAM, 2KB, 100KHZ, SOIC-8
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
应用领域在P12P63P135P136
导航目录
PCF8570T/F5,518数据手册
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若手册格式错乱，请下载阅览PDF原文件
DesignCon 2003 TecForum I
2
C Bus Overview
6
General concept for Serial communications
SCL
SDA
“MASTER”
SLAVE 1
SLAVE 2
SLAVE 3
DATA
Parallel to Serial
Shift Register
enable
enable
enable
select 3
select 2
select 1
R/W
R/W
R/W
READ
or
WRITE?
// to Ser.
Shift Reg#
// to Ser.
Shift Reg#
// to Ser.
Shift Reg#
• A point to point communication does not require a Select control signal
• An asynchronous communication does not have a Clock signal
• Data, Select and R/W signals can share the same line, depending on the protocol
• Notice that Slave 1 cannot communicate with Slave 2 or 3 (except via the ‘master’)
Only the ‘master’ can start communicating. Slaves can ‘only speak when spoken to’
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