33793 Datasheet, PDF (22/27 Pages) Freescale Semiconductor, Inc – Distributed System Interface (DSI) Sensor Interface

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
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Analog Integrated Circuit Device Data
Freescale Semiconductor