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參數(shù)資料
| 型號： | MC33298 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Eight Output Switch with Serial Peripheral Interface I/O(帶SPI接口的八輸出開關(guān)) |
| 中文描述： | 8個串行外圍接口的I / O（帶的SPI接口的八輸出開關(guān)輸出開關(guān)） |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 642K |
| 代理商： | MC33298 |
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33298
14
Go to: www.freescale.com
Figure 12. 33298 SPI System Daisy Chain
One main advantage of the 33298 is the serial port. When
coupled to an MCU, it receives ON/OFF commands from the
MCU and in return transmits the drain status of the device’s
output switches. Many devices can be
daisy-chained
together,
forming a larger system, illustrated in Figure 12.
Note
In this example, only one dedicated MCU parallel port
(aside from the required SPI) is required for chip select to
control 32 possible loads.
Multiple 33298 devices can also be controlled in a parallel input
fashion using SPI, illustrated in Figure 13. This figure shows a
possible 24 loads being controlled by only three dedicated
parallel MCU ports used for chip select.
Figure 13. Parallel Input SPI Control
Figure 14 illustrates a basic method of controlling multiple
33298 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 33298 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
33298. 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, Microcontroller Out Serial In (MOSI), and received by
another pin, Microcontroller In Serial Out (MISO), of the MCU.
Some features of SPI are:
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:
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
33298
33298
33298
33298
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
8 Outputs
A
B
C
Parallel
Ports
MC68XX
Microcontroller
SPI
SI
SCLK
CS
SI
SCLK
CS
SI
SCLK
CS
33298
33298
33298
SCLK
MOSI
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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| MC33298DW | 功能描述:IC SWITCH SERIAL OCTAL 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動器 - 內(nèi)部開關(guān) 系列:- 標準包裝:1,000 系列:- 類型:高端/低端驅(qū)動器 輸入類型:SPI 輸出數(shù):8 導通狀態(tài)電阻:850 毫歐，1.6 歐姆 電流 - 輸出 / 通道:205mA，410mA 電流 - 峰值輸出:500mA，1A 電源電壓:9 V ~ 16 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:PG-DSO-20-45 包裝:帶卷 (TR) |
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