33793(2010) データシートの表示（PDF） - Freescale Semiconductor

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33793
(Rev.:2010)

Distributed System Interface (DSI) Sensor Interface

Freescale Semiconductor 

TYPICAL APPLICATIONS

TYPICAL APPLICATIONS

BUSIN

IO0

IO1

IO2

IO3

Rectifiers

Bus Switch

0 – 35 V Bi-Directional

Forward Receiver

Data

Frame

Bandgap

Reference

Received

Message

from MCU

Response

Current

0 –11 mA

7.0 mA/μS

Bus Return

Oscillator

4.0 MHz

DataOut <3:0>

I/O Buffers

DataOut <0>

DataOut <1>

Logic

Command Decode

State Machine

Response Generation

4

Address A<3:0>

4 Bits NVM

DataOut <2>

DataOut <3>

I/O<3:0>

SEL

I/O0

I/O1

4:1

I/O2 MUX

I/O3

ADC

8 Bits

Reverse Receiver

Data

Frame

Bandgap

Reference

H_CAP

1.0 μF

Typical

BUSOUT

BUSRTN

Power

Management

5.0 V Regulator

BG Reference

Bias Currents

Logic Out

High Current

Buffer

Supply Comparators

POR

Undervoltage

Detector

LOGOUT

REGOUT

4.7 μF

GND

BG

COMMUNICATION FORMAT

DSI messages are composed of individual words

separated by a frame delay. Transfers are full duplex.

Command messages from the master occur at the same time

as responses from the slaves. Slave responses to commands

occur during the next command message. This allows slaves

Master

time to decode the command, retrieve the information and

prepare to send it to the master. A bus traffic example is

shown in Figure 6.

The example shows three commands separated by the

minimum frame delay followed by a command after a longer

delay.

Slave

Figure 6. Bus Traffic Example

33793

22

Analog Integrated Circuit Device Data

Freescale Semiconductor

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