MC33780 Datasheet, PDF (1/37 Pages) Freescale Semiconductor, Inc – Dual DBUS Master with Differential Drive and Frequency Spreading

Freescale Semiconductor
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 (T_A)
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
D0H
MOSI
D0L
MISO
RST
D1H
INT
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.