MC33989DW Freescale Semiconductor, MC33989DW Datasheet - Page 54

• Manufacturer Part Number: MC33989DW
• Description: IC SYSTEM BASE W/CAN 28-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33989DW

• Controller Type: System Basis Chip
• Interface: CAN
• Voltage - Supply: 5.5 V ~ 18 V
• Current - Supply: 45mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• For Use With: KIT33989DWEVB - KIT EVAL 33989DW HS SBC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SOFTWARE ASPECTS
Introduction
microcontroller SPI software routine that has to be executed
54
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
This section describes the MC33989 operation and the
TX
RX
TEC=128: the node reaches the error passive level
The DC current can be calculated as follows:
Idc= (Time in dominant * peak current of the fault) / total error frame time
Idc= (17+15)*peak current / ((23*15)+1408)=32 / 1753*peak current
Example for CANL2Vbat (peak current = - 240 mA): Idc = 32*(-) 240 / 1753=(-)4.38 mA
Rx is driven only during the glitch occuring on the CAN bus (the dominant time is shorter than a bit time)
23 recessive bits: CAN passive error frame
Node sends one dominant bit. As there is still the fault, the TEC is incremented by 8 each time.
Figure 46. Node is in Bus Off State
TEC reaches 255: the node is BUS OFF
in order to control the device. Structure of the Byte: ADR
(3 bits) + R/W (1bit) + DATA (4 bits). MSB is sent first. Refer
to MC33989 specifications for more details.
128 occurrences of 11 recessive bits
Analog Integrated Circuit Device Data
Freescale Semiconductor
BUS OFF is recover