參數(shù)資料
型號(hào)： PC33879DWBR2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSH DC MOTOR CONTROLLER, 1 A, PDSO32
封裝： PLASTIC, SOIC-32
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 747K
代理商： PC33879DWBR2
33879
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
14
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 (RDS(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 15 illustrates the
basic SPI configuration between an MCU and one 33879.
Figure 15. 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) to
the microcontroller a logic [1], while normal operating outputs
will provide a logic [0].
Figure 16 illustrates the daisy chain configuration using the
33879. Data from the MCU is clocked daisy chain through each
device while the Chip Select (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 16. 33879 SPI System Daisy Chain
Multiple 33879 devices can be controlled in a parallel input
fashion using the SPI. Figure 17 illustrates the control of
24 loads using three dedicated parallel MCU ports for chip
select.
Figure 17. Parallel Input SPI Control
Receive
Buffer
Parallel
Ports
To
Logic
33879
MC68HCxx
Microcontroller
DO
DI
CS
SCLK
MISO
MOSI
Shift Register
16 Bits
MC68HCxx
Microcontroller
with
SPI Interface
8 Outputs
CS
MISO
MOSI
Parallel Port
SCLK
DO
DI
DO
DI
DO
DI
CS
SCLK
33879
DI
SCLK
DO
CS
Parallel
Ports
MOSI
MISO
SCLK
8 Outputs
MC68HCxx
Microcontroller
with
SPI Interface
A
B
C
33879
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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