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參數(shù)資料
| 型號(hào)： | MCZ33291EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Eight-Output Switch with Serial Peripheral Interface I/O |
| 中文描述： | 8輸出開關(guān)串行外設(shè)接口的I / O |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 379K |
| 代理商： | MCZ33291EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
13
33291
FUNCTIONAL DESCRIPTION
INTRODUCTION
Figure 14. 33291 SPI System Daisy Chain
Multiple 33291 devices can also be controlled in a parallel
input fashion using SPI, illustrated in
Figure 15
. This figure
shows a possible 24 loads being controlled by only three
dedicated parallel MCU ports used for chip select.
Figure 15. Parallel Input SPI Control
Figure 16
, page
14
, illustrates a basic method of
controlling multiple 33291 devices using two MCUs. A system
can have only one master MCU at any given instant of time
and one or more slave MCUs. Master control of the system
must pass from one MCU to the other in an orderly manner.
The master MCU supplies the system clock signal (top MCU
designated the master); the lower MCU being the slave. It is
possible to have a system with more than one master;
however, not at the same time. Only when the master is not
communicating can a slave assume the
mastership
and
communicate. MCU master control is switched through the
use of the slave select (
SS
) pin of the MCUs. A master will
become a slave when it detects a logic low state on its
SS
pin.
These basic examples make the 33291 very attractive for
applications where a large number of loads require efficient
control. To this end, the popular Synchronous Serial
Peripheral Interface (SPI) protocol is incorporated to
communicate efficiently with the MCU.
SPI SYSTEM ATTRIBUTES
The SPI system is flexible enough to communicate directly
with numerous standard peripherals and MCUs available
from Motorola and other semiconductor manufacturers. SPI
reduces the number of pins necessary for input/output (I/O)
on the 33291. It also offers an easy means of expanding the
I/O function using few MCU pins. The SPI system of
communication consists of the MCU transmitting, in return it
receives one data-bit of information per system clock cycle.
Data bits of information are simultaneously transmitted by
one pin, Master Out Serial In (MOSI), and received by
another pin, Master In Serial Out (MISO), of the MCU.
Some features of SPI are as follows:
Full duplex, three-wire synchronous data transfer
Each microcontroller can be a master or a slave
Provides write collision flag protection
Provides end of message interrupt flag
Four I/Os associated with SPI (MOSI, MISO, SCLK, SS)
Drawbacks to SPI are as follows:
An MCU is required for efficient operational control
In contrast to parallel input control it is slower at performing
pulse width modulating (PWM) functions.
SCLK
Parallel Port
MISO
MOSI
IRQ
MC68XX
Microcontroller
SPI
SO
SO
SO
SO
CS
CS
CS
CS
SCLK
SCLK
SCLK
SCLK
SI
SI
SI
SI
33291
33291
33291
33291
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
A0
A1
A2
Parallel
Ports
MC68XX
Microcontroller
SPI
SI
SCLK
CS
SI
SCLK
CS
SI
SCLK
CS
33291
33291
33291
SCLK
MOSI
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33291EGR2 | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SERIAL SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEG | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SER SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEGR2 | 功能描述:電源開關(guān) IC - 配電 BASIC OCTAL SER SW RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG | 功能描述:電源開關(guān) IC - 配電 OCTAL SERIAL SWITCH RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Eight Output Switch with Serial Peripheral Interface I/O |
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