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参数资料
| 型号： | KIT33879AEKEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR MC33879 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，高端和低端驱动器（内部 FET） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33879 |
| 主要属性： | 8 个输出硬件-可配置 |
| 次要属性： | 16 位串行输入控制 |
| 已供物品： | 板，CD |
FUNCTIONAL DESCRIPTION
MCU INTERFACE DESCRIPTION
source is connected to ground. All outputs may be configured
individually as desired. When high side drive is used, the
33879 will limit the negative inductive transient to negative
20 V.
EXPOSED PAD PIN
Device will perform as specified with the Exposed Pad un-
terminated (floating) however, it is recommended that the
Exposed Pad be terminated to pin 1 (GND) and system
ground.
MCU INTERFACE DESCRIPTION
INTRODUCTION
The 33879 is an 8-output hardware-configurable power
switch with 16-bit serial control. A simplified internal block
The 33879 device uses high-efficiency up-drain power
DMOS output transistors exhibiting low drain-to-source ON
resistance (R DS(ON) = 0.75 ? at 25 ? C typical) and dense
CMOS control logic. All outputs have independent voltage
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.
SCLK
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
MC68HCxx
Microcontroller
with
SPI Interface
Parallel Port
33879
CS
MISO
DO DI
33879
CS SCLK
DO DI
33879
CS SCLK
DO DI
functions. This device directly interfaces to an MCU using a
SPI for control and diagnostic readout. Figure 15 illustrates
the basic SPI configuration between an MCU and one 33879.
MC68HCxx
33879
Microcontroller
MOSI
8 Outputs
8 Outputs
8 Outputs
Figure 16. 33879 SPI System Daisy Chain
Multiple 33879 devices can be controlled in a parallel input
Shift Register
MOSI
DI
Shift Register
fashion using the SPI. Figure 17 illustrates the control of
24 loads using three dedicated parallel MCU ports for chip
select.
16 Bits
MISO
DO
16 Bits
33879
Receive
Buffer
SCLK
To
Logic
MOSI
SCLK
MISO
DI
SCLK
DO
8 Outputs
Parallel CS
Ports
Figure 15. SPI Interface with Microcontroller
MC68HCxx
Microcontroller
with
SPI Interface
CS
DI
33879
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]
SCLK
DO
CS
33879
8 Outputs
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].
Parallel
Ports
A
B
C
DI
SCLK
DO
CS
8 Outputs
Figure 16 illustrates the daisy chain configuration using
the 33879. Data from the MCU is clocked daisy chain through
Figure 17. Parallel Input SPI Control
33879
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
15
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| KIT33880DWBEVB | 功能描述:电源管理IC开发工具 33880DWB COSS KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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| KIT33886DHEVB | 功能描述:电源管理IC开发工具 33886 PWR H-BRIDGE KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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