mc33889 Freescale Semiconductor, Inc, mc33889 Datasheet - Page 35

• Manufacturer Part Number: mc33889
• Description: System Basis Chip With Low Speed Fault Tolerant Can Interface
• Manufacturer: Freescale Semiconductor, Inc

Analog Integrated Circuit Device Data
Freescale Semiconductor
T
between the duration of the bus minus the Twake, as illustrated below (Trx_dom = Tbus_dom - Twake)
MC33889D in Normal mode
WAKE
Example: A dominant duration at the bus level of 5
bits of 8us each results in a 40us bus dominant.
This results in a 24µs (40µs-16µs) dominant level at
Rx of MC33889D (while the CAN of the MC33889D
is in TermVbat).
CANL
CANH
Recessive
Rx
state
: duration of the CAN wake up filter, typ 16µs. The MC33889D Rx dominant low level duration is the difference
CAN in TxRx
Figure 15. Bus State Report of the CAN Interface Wake-Up Comparator on CANL and CANH
Dominant
state
CANL terminated to Vbat
MC33889D in Normal mode, Standby mode or in stop mode
CAN in TermVbat
Rx MC33889D
Tx sender node
Tx MC33889D
T
Dominant
WAKE
state
Other CAN node send
Recessive
state
T
WAKE
T
WAKE
Dominant state
TBUS_DOM
FUNCTIONAL DEVICE OPERATION
TRX_DOM
MC33889D in Normal mode
OPERATIONAL MODES
CAN in TxRx
33889
35