參數(shù)資料
型號(hào)： MC33389DDW
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 13/49頁(yè)
文件大?。?/td> 0K
描述： IC SYSTEM BASE W/CAN 28-SOIC
標(biāo)準(zhǔn)包裝： 1
控制器類(lèi)型： 系統(tǒng)基礎(chǔ)芯片
接口： CAN
電源電壓： 5.5 V ~ 18 V
電流 - 電源： 45mA
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
33389
FUNCTIONAL DEVICE OPERATION
speed applications up to 125 kBit/s in passenger cars. It
provides differential transmission capability, but will switch in
error condition to single wire transmitter and/or receiver.
The rise and fall slopes are limited to reduce radio
frequency interference (RFI). This provides use of an
unshielded twisted pair or a parallel pair of wires for the bus.
It supports transmission capability on either bus wire if one of
the bus wire is corrupted. The logic failure detection
automatically selects a suitable transmission mode.
In a normal operation (no wiring failures), the differential
bus state is the output to RX. The differential receiver inputs
are connected to CANH and CANL through integrated filters.
The filtered inputs signals are also used for the single wire
receivers. The CANH and CANL receivers have threshold
voltages, assuring maximum noise margin in single wire
modes. In the RX Only mode, the transmitter is disabled;
however, the receive part of the transceiver remains active. In
this mode, RX reports bus and TX activity (RX = TX or Bus
dominant). Failure detection and management is the same as
the Bus Normal mode.
Failure Detector
The failure detector is active in RXTX and RX Only
operation modes. The detector recognizes the following
single bus failures and switches to an appropriate mode.
1. CANH wire interrupted
2. CANL wire interrupted or shorted to 5.0 V
3. CANH short-circuit to battery
4. CANL short-circuit to ground
5. CANH short-circuit to ground
6. CANL short-circuit to battery
7. CANL mutually shorted to CANH
8. CANH to V2 (5.0 V)
Note: Shorts-circuit failures are detected for 0 to 50
shorts.
The differential receiver (CANH-CANL) threshold is set at
-2.8 V, this assures a proper reception in the normal
operating modes. In case of failures 1, 2, and 5 the on-going
message is not destroyed due to noise margin.
Failures 3 and 6 are detected by comparators respectively
connected to CANH and CANL. If the comparator threshold
is exceeded for a certain time (TAC3D, TAC6D), the reception
is switched to single wire mode. This time is required to avoid
false triggering by external RF fields. Recovery from these
failures is detected automatically after a certain (TAC3R,
TAC6R) time-out (filtering).
Failures 4 and 7 initially result in a permanent dominant
level at RX. After a time-out, the CANL driver and the RTL
pins are switched OFF. Only a weak pull-up at CANL
remains. Reception continues by switching to Single Wire
mode through CANH. When Failures 4 or 7 are removed, the
recessive bus levels are restored. If the differential voltage
remains below the recessive threshold for a certain (TAC478R)
time, reception and transmission switch back to the
Differential mode.
If any of the eight wiring failure occurs, a flag is set in the
TESRH and TESRL Status registers. Eight different types of
errors are distinguished out of these eight errors. They are
separately stored in these register. Please refer to the
Tables 35 and 36. A maskable interrupt is sent to the
microcontroller. On error recovery, the corresponding flag is reset
after read-out operation.
During all single wire transmissions, the EMC performance
(both immunity and emission) is worse than in the Differential
mode. Integrated receiver filters suppress any high frequency
noise induced into the bus wires. The cut-off frequency of
these filters is a compromise between propagation delay and
high frequency suppression. In the Single Wire mode, low
frequency noise can not be distinguished from the expected
signal.
In the event of a permanent dominant TX state (for more
than 2.0 ms) the output drivers are disabled. That assures the
operation of the complete system in case of a permanent
dominant TX state of one control unit. The CAN interface of a
defective ECU, which has TX permanently low, will
automatically be set to the receive only mode and therefore
will not lock the complete CAN bus.
Protection
A current limiting circuit protects the transmitter output
stages against short-circuit to positive and negative battery
voltage. If the junction temperature exceeds a maximum
value, the transmitter output stages are disabled. Because
the transmitter is responsible for a part of the power
dissipation, this results in a reduced power dissipation
resulting in a lower chip temperature. All other parts of the
transceiver will remain operating. The CANH and CANL
inputs are protected against electrical transients, and may
occur in an automotive environment.
Thermal Management
The 33389 is proposed in two different packages:
1. HSOP-20 for high power applications
2. SO28WB with eight pins to the lead frame for medium
power applications
HSOP20 Package
For such a package, the heat flow is mainly vertical and
each heat source (dissipating element) can be seen as an
independent thermal resistance to the Heatsink. The thermal
network can be roughly depicted in Figure 6.
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