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Freescale Semiconductor Electronic Components Datasheet



MC33780

Dual DBUS Master


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MC33780 pdf
www.DFatraSeheesetc4Ua.lceomSemiconductor
Technical Data
Document order number: MC33780
Rev 3.0, 5/2006
Dual DBUS Master with
Differential Drive and
Frequency Spreading
The 33780 is a master device for two differential DBUS buses. It
contains the logic to interface the buses to a standard serial
peripheral interface (SPI) port and the analog circuitry to drive data
and power over the bus as well as receive data from the remote slave
devices.
The differential mode of the 33780 generates lower electro-
magnetic interference (EMI) in situations where data rates and wiring
make this a problem. Frequency spreading further reduces in-
terference by spreading the energy across many channels, reducing
the energy in any single channel.
Features
• Two Independent DBUS I/Os
• Common SPI Interface for All Operations
• Open-Drain Interrupt Output with Pull-up
• Maskable Interrupts for Send and Receive Data Status
• Automatic Message Cyclical Redundancy Checking (CRC)
Generation and Checking
• Four-Stage Transmit and Receive Buffers
• 8- to 16-Bit Messages with 0- to 8-Bit CRC
• Independent Frequency Spreading for Each Channel
• Pb-Free Packaging Designated by Suffix Code EG
33780
DIFFERENTIAL DBUS MASTER
EG (Pb-FREE SUFFIX)
98ASB42567B
16-TERMINAL SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33780EG/R2 -40°C to 85°C
16 SOICW
+5.0 V
+25 V
MCU
VCC
SCLK
CS
MOSI
MISO
RST
INT
CLK
GND
33780
VCC VSUP
SCLK
CS
MOSI
MISO
D0H
D0L
RST
INT
D1H
D1L
CLK
GND
DSI/DBUS SLAVE
Twisted Pair
33793
DSI/DBUS SLAVE
33793
4.7 nF capacitors from D0H, D0L, D1H
and D1L to circuit ground are required
for proper operation.
Figure 1. 33780 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2006. All rights reserved.



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MC33780 pdf
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INTERNAL BLOCK DIAGRAM
VCC
VSUP
CLK
SCLK
MISO
MOSI
CS
INT
RST
Spreader
SPI,
Registers and
Interrupt
Generator
TLIM
DSIF
DSIS
DSIR
DBUS
Driver/Receiver
DSIF
DSIS
DSIR
DBUS
Driver/Receiver
Figure 2. 33780 Internal Block Diagram
D0H
D0L
D1H
D1L
GND
GND
GND
33780
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Part Number MC33780
Description Dual DBUS Master
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 30 Pages
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