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PCA9548ABS,118 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:
HVQFN-24
描述:
PCA9548 系列 8-通道 I2C-总线 转换开关 带复位 - HVQFN - 24
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PCA9548ABS,118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 4 of 64
NXP Semiconductors
UM10204
I
2
C-bus specification and user manual
• Serial, 8-bit oriented, unidirectional data transfers up to 5 Mbit/s in Ultra Fast-mode
• On-chip filtering rejects spikes on the bus data line to preserve data integrity.
• The number of ICs that can be connected to the same bus is limited only by a
maximum bus capacitance. More capacitance may be allowed under some
conditions. Refer to Section 7.2
.
Figure 1
shows an example of I
2
C-bus applications.
2.1 Designer benefits
I
2
C-bus compatible ICs allow a system design to progress rapidly directly from a
functional block diagram to a prototype. Moreover, since they ‘clip’ directly onto the
I
2
C-bus without any additional external interfacing, they allow a prototype system to be
modified or upgraded simply by ‘clipping’ or ‘unclipping’ ICs to or from the bus.
Here are some of the features of I
2
C-bus compatible ICs that are particularly attractive to
designers:
• Functional blocks on the block diagram correspond with the actual ICs; designs
proceed rapidly from block diagram to final schematic.
• No need to design bus interfaces because the I
2
C-bus interface is already integrated
on-chip.
Fig 1. Example of I
2
C-bus applications
I
2
C
A/D or D/A
Converters
I
2
C
General Purpose
I/O Expanders
I
2
C
LED Controllers
V
DD4
I
2
C
Repeaters/
Hubs/Extenders
I
2
C
DIP Switches
V
DD5
I
2
C
Slave
V
DD0
V
DD1
PCA9541
I
2
C
Master Selector/
Demux
I
2
C
Multiplexers
and Switches
V
DD2
I
2
C Port
via HW or
Bit Banging
I
2
C
Bus Controllers
MCUs
8
MCUs
I
2
C
Serial EEPROMs
LCD Drivers
(with I
2
C)
I
2
C
Real Time Clock/
Calendars
V
DD3
I
2
C
Temperature
Sensors
Bridges
(with I
2
C)
SPI
UART
USB
002aac858
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