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PDF MC33388 Data sheet ( Hoja de datos )

Número de pieza MC33388
Descripción Fault Tolerant CAN Interface
Fabricantes Motorola Semiconductors 
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No Preview Available ! MC33388 Hoja de datos, Descripción, Manual

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Rev: 2.2 Date: 02 Nov 2000
Advance Information
Fault Tolerant CAN Interface
MC33388
The MC33388 is a CAN physical interface device, dedicated to
automotive body electronic multiplexing applications. It operates in
differential mode, allowing ground shifts up to 1,5V, reducing RFI
disturbances. It offers very low standby current in sleep and standby
mode operation and supports communication speeds up to 125kBauds.
It is fully protected against harsh automotive environments and the
driver is able to detect fault conditions and automatically switches into
appropriate default mode. Under fault condition, it continuously monitors
bus failures in order to switch back to normal bus operation as soon as
faults disappeared.
AUTOMOTIVE FAULT TOLERANT
CAN PHYSICAL LAYER
SEMICONDUCTOR
TECHNICAL DATA
• Very low sleep/standby current (15µA typical)
• Baud rate from 10 kBaud up to 125kBauds
• Automatic switching to single wire mode in case of bus failures and
return to differential mode if bus failures disappear
• Supports one wire transmission modes with ground offset up to 1.5V
• Internal bus driver slope control function to minimize RFI
• Bus line short-circuit protected to battery, VDD and ground
• Bus line protected against automotive transients
• Thermal protection of bus line drivers
• Supports unshielded twisted pair bus
• An unpowered node does not disturb the bus lines
D SUFFIX
PLASTIC PACKAGE
CASE 751A-03
SO-14
• Wake-up capability triggered from bus message and wake-up input pin
• Wake up pin with dual edges sensitivity
• Battery fail flag reported on NERR output
www.DataSheet4U.com• Ambient temperature range from -40°C to 125°C.
PIN CONNECTIONS
Simplified Block Diagram
VDD BAT
WAKE
EN
STB
INH
TX
MODE CONTROL
VDD
PROTECTION
SLOPE
CONTROL
&
DRIVER
WAKE-UP LOGIC
12.5k
S2 S5 S3
S4
S1
RTL
CANH
CANL
RTH
INH 1
TX 2
RX 3
NERR 4
STB 5
EN 6
WAKE 7
14 BAT
13 GND
12 CANL
11 CANH
10 VDD
9 RTL
8 RTH
(Top View)
NERR
FAILURE DETECTION
RX
MUX
GND
RECEIVER
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC33388D TA = -40 to 125°C
SO-14
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MC33388 pdf
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MC33388
AC CHARACTERISTICS VDD = 4,75 to 5,25 ; VBAT=6 to 27V ; Tamb = -40 to 125°C unless otherwise specified
CANL and CANH Slew Rates (10% to 90%).
Rising or Falling Edges. NOTE2.
Tsl 3.5
5
Propagation Delay TX to RX Low. NOTE2.
Tpdlow
1
Propagation Delay TX to RX High. NOTE2.
Tpdhigh
1
Min. Dominant Time For Wake-up On CANL or CANH
(Vbat Standby And Sleep Modes ; VBAT = 12V)
Twake
8 16
Min. WAKE Time For Wake-up
(Vbat Standby And Sleep Modes ; VBAT= 12V)
Twake
6 15
Failure 3 Detection Time (Normal Mode)
Tdf3 10
Failure 6 Detection Time (Normal Mode)
Tdf6 50
Failure 3 Recovery Time (Normal Mode)
Tdr3
10
Failure 6 Recovery Time (Normal Mode)
Tdr6
150
Failure 4, 7, 8 Detection Time (Normal Mode)
Tdf478
0.75
Failure 4, 7, 8 Recovery Time (Normal Mode)
Tdr478
10
Failure 3, 4, 7,8 Detection Time
(Vbat Standby And Sleep Modes ; VBAT = 12V)
Tdr347
0.8
Failure 3, 4, 7,8 Recovery Time
(Vbat Standby And Sleep Modes ; VBAT = 12V)
Tdr347
2.5
Minimum Hold Time For “Go To Sleep” Command
Tgts
4
Edge Count Difference Between CANH and CANL for
www.DataSheet4U.comFailures 1, 2, 5 Detection (NERR Becomes Low), (Normal Mode)
Ecdf
3
Edge Count Difference Between CANH And CANL For
Failures 1, 2, 5 Recovery (Normal Mode)
Ecdr
3
TX Permanent Dominant Timer Disable Time
(Normal Mode And Failure Mode)
tTX,d
0.75
TX Permanent Dominant Timer Enable Time
(Normal Mode And Failure Mode)
tTX,e
10
NOTE:
1. When VBAT is greater than 18V, the wake up thresholds remain identical to the wake up thresholds at 18V.
2. AC Characteristics measured according to schematic figure 2.
10
2
2
30
30
60
400
60
1000
4
60
8
38
V/µs
µs
µs
µs
µs
µs
µs
µs
µs
ms
µs
ms
ms
µs
4 ms
60 µs
MC33388
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MC33388 arduino
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MC33388
PIN FUNCTION DESCRIPTION
VBAT (input) : This is the supply line of the device. It can
STB and EN : Input pins used to configure the device into
be directly connected to the battery line, can operate up to desired mode. These pins are CMOS compatible and are
27VDC and sustains up to 40V during load dump condition. connected to the microcontroller of the application.
The supply current is dependant upon the device operation
mode. In low power mode, it is as low as 12uA typical. A
INH : This is an output of the MC33388 used to control an
battery fail flag circuitry is associated to this pin.
external voltage regulator having an inhibit input. INH is a high
The Vbat pin must be protected by external component side switch structure, active when the MC33388 is in normal,
against reverse battery and negative transient voltages.
Receive only or Standby VBAT modes. INH is switched off in
Sleep mode to switch off the voltage regulator of the
VDD (input) : 5V input supply voltage for the device. In application. INH has no pull down structure.
normal mode, the current is up to 5mA typical and do not
exceed few uA in Vbat standby mode. An under voltage
WAKE : This is a high voltage input used to wake up the
function is associated to Vdd and resets the device to Vbat device from Sleep and VBAT Standby modes. Wake is
standby mode when Vdd falls below 3V.
usually connected to an external switch in the application. The
typical wake thresholds are Vbat/2.
CANH : Bus output driver pin. CANH is a high side switch
Wake pin has special design structure and allows wake up
structure connected to VDD supply. In recessive state, the from both high to low or low to high transitions. When entering
high side switch is off and bus CANH line is biassed through into the Sleep or VBAT Standby mode, the MC33388
the Rth pin circuitry and external Rth resistor. In dominant monitors the state of the wake pin and stores it as reference
state, high side switch is on and CANH line is switched to state. The opposite state of this reference state will be the
VDD. Output voltage is above 3.6V. CANH output is protected wake up event used by the device to enter again into normal
against short-circuit to ground, by internal current limitation. A mode.
thermal shutdown with hysteresis switches off CANH driver if
An internal filter is implemented, with 8 to 38 µs filtering
temperature rises above 150°C. CANH is also protected time delay. Wake pin input structure exhibits a high
against short-circuit to higher voltage, such as VBAT by an impedance, with extremely low input current. A serial resistor
internal serial diode in series with the switching component. should be inserted in order to limit the input current mainly
CANH has a pull down current source, typically 75uA, which during transient pulses.
can be activated under some fault condition.
CAUTION : The Wake pin should not be left open. If wake
up function is not used, wake should be connected to GND to
Rth : Connection to the CANH bus terminal resistors. Rth avoid false wake up.
output structure is a low side switch, turned on under normal
condition and automatically desactivated under some fault
www.DataSheet4U.comcondition. In the application, an external resistor is con-
TX : Transmitter input pin to control bus state. It is CMOS
compatible and usually directly connected to the TX output of
nected between Rth and CANH pins. In recessive state a microcontroller. When TX is at high state, CANH and CANL
when CANH driver is off, CANH line is tied to ground through are in recessive state. When TX is low, CANL and CANH are
the external Rth resistor.
in dominant state. Special fault handling is provided to this
input, in order to detect permanent dominant state (TX low)
CANL : Bus output driver pin. CANL is a low side switch which would result of CAN bus permanently lock in dominant
structure to the ground. In recessive state, the low side switch state and do not allow communication. In case where TX is
is off, and bus CANL line is biassed through the Rtl circuitry low for more than 2ms typical, the device automatically
and external Rtl resistor. In dominant state, low side switch is switches the bus lines to recessive. TX has an internal pull up
on and CANL line is switched to ground. Output voltage is resistor to VDD.
below 1.4V. CANL output is protected against short-circuit to
VBAT, by internal current limitation. A thermal shutdown with
RX : Output receiver connection to the microcontroller. It
hysteresis is integrated and switches off CANL driver if reports the bus state to the RX input pin of the microcontroller.
temperature rises above 150°C. CANL is protected against RX is high when bus is recessive and low in dominant state. In
negative voltage, by an internal serial diode in series with the sleep and standby Vbat modes, RX reports wake up events.
switching component. CANL has a pull up current source,
typically 75uA, activated under some fault condition.
NERR : Error output pin which reports errors encountered
by the device. When NERR is high, no error is reported, when
Rtl : Connection to the CANL bus terminal resistors. Rtl NERR is low an error has been detected. In Standby VBAT
output structure is a low side switch, turned on under normal mode NERR reports a wake up event. In receive only mode,
condition and automatically desactivated under some fault NERR reports VBAT power on flag.
condition. In the application, an external resistor is connected
between Rtl and CANL pins. In recessive state when CANL
driver is off, CANL line is tied to VDD through external Rtl
Table 3 • Truth Table of RX, TX CAN Bus States
resistor.
In VBAT Standby and Sleep modes, Rtl pin is connected
TX RX Bus States
Comment
to the VBAT line through an internal switch and a 12.5k
resistor. This means that in these modes CANL bus line is
Low Low Dominant
biassed to VBAT. Wake up from these modes are detected by
High High Recessive
CANL line going from VBAT level to CANL wake up threshold
level.
High Low Dominant
Bus Driven By Other Node
MC33388
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