參數(shù)資料
型號(hào)： MC68HC55CD
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 4 CHANNEL(S), SERIAL COMM CONTROLLER, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 23/40頁(yè)
文件大小： 284K
代理商： MC68HC55CD
MC68HC55 Technical Data
General Description of the DSI System
MC68HC55
Technical Data
DSI/D (Distributed System Interface – Digital)
3
1.2 General Description of the DSI System
The distributed system interface is intended as a robust serial interface
system suitable for automotive body applications including airbag safety
systems. Specific goals of this system include:
Reduction of intermodule wiring by using a 2-conductor bus.
Provide power to remote nodes on the same pair of wires
Self-organizing system (modules need not be programmed prior
to installation)
No critical timing components such as crystals in remote nodes
(subject to damage in a crash)
Wave shaped signals to minimize electrical noise
CRC error checking on all messages to assure message integrity
1.3 Overall DSI System Connections
The DSI system consists of:
Master MCU such as the MC68HC16P3
One or more DSI/D devices, one DSI/P dual analog SmartMOS
device per DSI/D
Up to 15 remote sensor and firing units per DSI bus
In this DSI system, the master MCU will communicate with the DSI/D via
the SPI. The DSI/D will in turn communicate with a DSI/P via three wires
using CMOS levels. Finally, the analog DSI/P will interface to the 2-wire
DSI bus using a combination of pulse length encoded voltage levels for
transmission of data to remote peripheral units and current return signals
for received data at the same time. All signals on the 2-wire DSI physical
layer bus are wave-shaped to minimize electrical noise. Refer to
for the following discussion.
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