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Freescale Semiconductor Electronic Components Datasheet

MC33990 Datasheet

Enhanced Class B Serial Transceiver

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MC33990 pdf
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Advance Information
Document Number: MC33990
Rev 3.0, 11/2006
Enhanced Class B Serial
Transceiver
33990
The 33990 is a serial transceiver designed to provide bi-directional
half-duplex communication meeting the automotive SAE Standard J-
1850 Class B Data Communication Network Interface specification. It
is designed to interface directly to on-board vehicle microcontrollers
and serves to transmit and receive data on a single-wire bus at data
rates of 10.4 kbps using Variable Pulse Width Modulation (VPWM).
The 33990 operates directly from a vehicle's 12 V battery system and
functions in a true logic fashion as an I/O interface between the
microcontroller's 5.0 V CMOS logic level swings and the required 0 V
to 7.0 V waveshaped signal swings of the bus. The bus output driver
is short circuit current limited.
Features
• Designed for SAE J-1850 Class B Data Rates
• Full Operational Bus Dynamics Over a Supply Voltage of 9.0 V
to 16 V
Ambient Operating Temperature of -40°C to 125°C
• Interfaces Directly to Standard 5.0 V CMOS Microcontroller
• BUS Pin Protected Against Shorts to Battery and Ground
• Thermal Shutdown with Hysteresis
• Voltage Waveshaping of Bus Output Driver
• Internally Reverse Battery Protected
• 40 V Max VBAT Capability
• Pb-Free Packaging Designated by Suffix Code EF
J-1850 SERIAL TRANSCEIVER
D SUFFIX
EF SUFFIX (PB-FREE)
98ASB42564B
8-PIN SOICN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33990D/DR2
MCZ33990EF/R2
-40°C to 125°C
8 SOICNN
VBAT
33990
+VBAT
BUS
Primary
Node
MCU
SLEEP
TX LOAD
RX
4X/LOOP
GND
Secondary
Nodes
Figure 1. 33990 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.



Freescale Semiconductor Electronic Components Datasheet

MC33990 Datasheet

Enhanced Class B Serial Transceiver

No Preview Available !

MC33990 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VBAT
SLEEP
TX
RX
4X/LOOP
4.5 V
Reference
Digital Output
Driver
33990
Voltage
Regulator
Waveshaping
Filter
4X Enable
Loopback
Bus
Driver
Thermal
Shutdown
BUS
Loss of Ground
Protection
LOAD
GND
Note This device contains approximately 400 active transistors and 250 gates.
Figure 2. 33990 Simplified Internal Block Diagram
33990
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Freescale Semiconductor Electronic Components Datasheet

MC33990 Datasheet

Enhanced Class B Serial Transceiver

No Preview Available !

MC33990 pdf
PIN CONNECTIONS
PIN CONNECTIONS
SLEEP
GND
LOAD
BUS
11
22
33
44
88 RX
77 TX
66 4X/LOOP
5 5 VBAT
Figure 3. 33990 Pin Connections
Table 1. 33990 Pin Definitions
Pin Number
1
2
3
4
5
6
Pin Name
SLEEP
GND
LOAD
BUS
VBAT
4X/ LOOP
Definition
Enables the transceiver when Logic 1 and disables the transceiver when Logic 0.
Device ground pin.
Accommodates an external pull-down resistor to ground to provide loss of ground protection.
Waveshaped SAE Standard J-1850 Class B transmitter output and receiver input.
Provides device operating input power.
Tristate input mode control; Logic 0 = normal waveshaping, Logic 1 = waveshaping disabled for 4X
transmitting, high impedance = loopback mode.
7 TX Serial data input (DI) from the microcontroller to be transmitted onto Bus.
8 RX Bus received serial data output (DO) sent to the microcontroller.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33990
3




Part Number MC33990
Description Enhanced Class B Serial Transceiver
Maker Freescale Semiconductor
Total Page 16 Pages
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