參數(shù)資料
型號(hào)： MC33879
廠商： Motorola, Inc.
英文描述： Single Output LDO, 1.0A, Adj.(1.25 to 13.5V), Internal Current limit, Thermal Overload Protection 4-SOT-223
中文描述： 串行配置八路與開放式負(fù)荷開關(guān)電流檢測(cè)禁用
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 408K
代理商： MC33879
33879
14
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
MCU INTERFACE DESCRIPTION
Introduction
The 33879 is an 8-output hardware-configurable power
switch with 16-bit serial control. A simplified block diagram of
the 33879 is shown in
Figure 1
on page 2.
The 33879 device uses high-efficiency up-drain power
DMOS output transistors exhibiting low drain-to-source ON
resistance (R
DS(ON)
= 1.0
at 25
°
C typical) and dense CMOS
control logic. All outputs have independent voltage clamps to
provide fast inductive turn-off and transient protection.
In operation, the 33879 functions as an 8-output serial switch
serving as a 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. This device directly interfaces to an MCU using a SPI
for control and diagnostic readout.
Figure 13
illustrates the
basic SPI configuration between an MCU and one 33879.
Figure 13. SPI Interface with Microcontroller
All inputs are compatible with 5.0 V and 3.3 V CMOS logic
levels and incorporate positive logic. When a SPI bit is
programmed to a logic [0], the corresponding output will be
OFF. Conversely, when a SPI bit is programmed to logic [1] the
output being controlled will be ON. Diagnostics are treated in a
similar manner. Outputs with a fault will feed back (via DO) a
logic [1] to the microcontroller, while normal operating outputs
will provide a logic [0].
Figure 14
illustrates the daisy chain configuration using the
33879. Data from the MCU is clocked daisy chain through each
device while the
CS
bit is commanded low by the MCU. During
each clock cycle, output status from the daisy chain is
transferred to the MCU via the Master In Slave Out (MISO) line.
On rising edge of
CS,
command data stored in the input register
is then transferred to the output driver.
Figure 14. 33879 SPI System Daisy Chain
Multiple 33879 devices can be controlled in a parallel input
fashion using the SPI.
Figure 15
illustrates the control of
24 loads using three dedicated parallel MCU ports for chip
select.
Figure 15. Parallel Input SPI Control
Receive
Buffer
Parallel
Ports
To
Logic
33879
MC68HCxx
Microcontroller
DO
DI
CS
SCLK
MISO
MOSI
Shift Register
Shift Register
16 Bits
16 Bits
MC68HCxx
Microcontroller
with
SPI Interface
8 Outputs
8 Outputs
8 Outputs
CS
MISO
MOSI
Parallel Port
SCLK
DO
DI
DO
DI
DO
DI
CS
CS
SCLK
SCLK
33879
33879
33879
DI
DI
DI
SCLK
DO
SCLK
DO
SCLK
DO
CS
CS
CS
Parallel
Ports
MOSI
SCLK
MISO
8 Outputs
8 Outputs
8 Outputs
MC68HCxx
Microcontroller
with
SPI Interface
A
B
C
33879
33879
33879
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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參數(shù)描述
MC33879APEK 功能描述:電源開關(guān) IC - 配電 CONFIG 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
MC33879APEKR2 功能描述:電源開關(guān) IC - 配電 CONFIG 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
MC33879EK 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SERIAL SW W 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
MC33879EKR2 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SERIAL SW W 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
MC33879TEK 功能描述:電源開關(guān) IC - 配電 CONFIG OCTAL SER 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
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