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參數(shù)資料
| 型號： | MCZ33291EG |
| 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 |
| 中文描述： | 8輸出開關串行外設接口的I / O |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 379K |
| 代理商： | MCZ33291EG |
Analog Integrated Circuit Device Data
Freescale Semiconductor
12
33291
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33291 was conceived, specified, designed, and
developed for automotive applications. It is an eight-output
low-side power switch having 8-bit serial control. The 33291
incorporates SMARTMOS technology having CMOS logic,
bipolar/MOS analog circuitry, and independent state of the
art double diffused MOS (DMOS) power output transistors.
Many benefits are realized as a direct result of using this
mixed technology. A simplified block diagram delineates
33291 in
Figure 2
.
Where bipolar devices require considerable control
current for their operation, structured MOS devices, since
they are voltage controlled, require only transient gate
charging current affording a significant decrease in power
consumption. The CMOS capability of the SMARTMOS
process allows significant amounts of logic to be
economically incorporated into the monolithic design.
Additionally, the bipolar/MOS analog circuits embedded
within the updrain power DMOS output transistors monitor
and provide fast, independent protection control functions for
each individual output. All outputs have internal 45 V at 0.5 A
independent output voltage clamps to provide fast inductive
turn-off and transient protection.
The 33291 uses high-efficiency updrain power DMOS
output transistors exhibiting very low room temperature
drain-to-source ON resistance values (R
DS(ON)
≤
1.0
at
13 V V
PWR
) and dense CMOS control logic. Operational bias
currents of less than 2.0 mA (1.0 mA typical) with any
combination of outputs ON are the result of using this mixed
technology and would not be possible with bipolar structures.
To accomplish a comparable functional feature set using a
bipolar structure approach would result in a device requiring
hundreds of milliamperes of internal bias and control current.
This would represent a very large amount of power to be
consumed by the device itself and not available for load use.
During operation, the 33291 functions as an eight output
serial switch serving as a microcontroller (MCU) bus
expander and buffer with fault management and fault
reporting features. In doing so, the device directly relieves the
MCU of the fault management functions. The 33291 directly
relieves the MCU of the fault management functions. The
33291 directly interfaces to an MCU, operating at system
clock serial frequencies in excess of 3.0 MHz. It uses a
Synchronous Peripheral Interface (SPI) for control and
diagnostic readout.
Figure 13
illustrates the basic SPI
configuration between an MCU and one 33291.
Figure 13. SPI Interface with Microcontroller
The circuit can also be used in a variety of other
applications in the computer, telecommunications, and
industrial fields. It is parametrically specified over an input
battery/supply range of 9.0 V to 16 V but is designed to
operate over a considerably wider range of 5.5 V to 26.5 V.
The design incorporates the use of logic level MOSFETs as
output devices. These MOSFETs are sufficiently turned ON
with a gate voltage of less than 5.0 V, thus eliminating the
need for an internal charge pump. Each output is identically
sized and independent in operation. The efficiency of each
output transistor is such that at room temperature with as little
as 9.0 V supply (V
PWR
), the maximum R
DS(ON)
of an output
at room temperature is 1.2
(0.9
typical) and increases to
only 2.0
as V
PWR
is decreased to 5.5 V.
All inputs are compatible with 5.0 V CMOS logic levels,
incorporating negative or inverted logic. Whenever an input is
programmed to a logic low state (<1.0 V) the corresponding
low side switched output being controlled will be active low
and turned ON. Conversely, whenever an input is
programmed to a logic high state (>3.0 V), the output being
controlled will be high and turned OFF.
One main advantage of the 33291 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, as illustrated in
Figure 14
,
page
13
.
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.
33291
MC68HCXX
Microcontroller
Shift Register
Shift Register
To
Logic
Receive
Buffer
Parallel
Ports
MOSI
SI
MISO
SO
SCLK
RST
CS
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33291EGR2 | 功能描述:電源開關 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 開啟時間（最大值）:400 us 關閉時間（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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEG | 功能描述:電源開關 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 開啟時間（最大值）:400 us 關閉時間（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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33291LEGR2 | 功能描述:電源開關 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 開啟時間（最大值）:400 us 關閉時間（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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MCZ33298EG | 功能描述:電源開關 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 開啟時間（最大值）:400 us 關閉時間（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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