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PCA9500PW,112 产品设计参考手册 - NXP（恩智浦）
制造商:
NXP（恩智浦）
分类:
接口芯片
封装:
TSSOP-16
描述:
NXP PCA9500PW,112 芯片, 输入/输出扩展器, I2C, 8位, 16TSSOP
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PCA9500PW,112数据手册
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UM10204 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
User manual Rev. 6 — 4 April 2014 5 of 64
NXP Semiconductors
UM10204
I
2
C-bus specification and user manual
• Integrated addressing and data-transfer protocol allow systems to be completely
software-defined.
• The same IC types can often be used in many different applications.
• Design-time reduces as designers quickly become familiar with the frequently used
functional blocks represented by I
2
C-bus compatible ICs.
• ICs can be added to or removed from a system without affecting any other circuits on
the bus.
• Fault diagnosis and debugging are simple; malfunctions can be immediately traced.
• Software development time can be reduced by assembling a library of reusable
software modules.
In addition to these advantages, the CMOS ICs in the I
2
C-bus compatible range offer
designers special features which are particularly attractive for portable equipment and
battery-backed systems.
They all have:
• Extremely low current consumption
• High noise immunity
• Wide supply voltage range
• Wide operating temperature range.
2.2 Manufacturer benefits
I
2
C-bus compatible ICs not only assist designers, they also give a wide range of benefits
to equipment manufacturers because:
• The simple 2-wire serial I
2
C-bus minimizes interconnections so ICs have fewer pins
and there are not so many PCB tracks; result — smaller and less expensive PCBs.
• The completely integrated I
2
C-bus protocol eliminates the need for address decoders
and other ‘glue logic’.
• The multi-master capability of the I
2
C-bus allows rapid testing and alignment of
end-user equipment via external connections to an assembly line.
• The availability of I
2
C-bus compatible ICs in various leadless packages reduces
space requirements even more.
These are just some of the benefits. In addition, I
2
C-bus compatible ICs increase system
design flexibility by allowing simple construction of equipment variants and easy
upgrading to keep designs up-to-date. In this way, an entire family of equipment can be
developed around a basic model. Upgrades for new equipment, or enhanced-feature
models (that is, extended memory, remote control, etc.) can then be produced simply by
clipping the appropriate ICs onto the bus. If a larger ROM is needed, it is simply a matter
of selecting a microcontroller with a larger ROM from our comprehensive range. As new
ICs supersede older ones, it is easy to add new features to equipment or to increase its
performance by simply unclipping the outdated IC from the bus and clipping on its
successor.
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