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MOTOROLA
SEMICONDUCTOR
TECHNICAL DATA
MC33388
CAN Interface
SILICON MONOLITHIC INTEGRATED CIRCUIT
Prototype Information
CAN Interface
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. Dedicated to 12 V systems Ambient temperature range from -40C to 125C. Baud rate from 10 kBaud up to 125kBaud Bus line short-circuit protected to battery, VDD and ground Thermal protection of bus line drivers Automatic switching to single wire mode in case of bus failures and reset to differential mode if bus failures are disappeared Supports one wire transmission modes with ground offset up to 1.5V Internal bus driver slope control function to minimize RFI Bus line protected against transients in an automotive environment Very low sleep/standby current (15mA) Wake-up capability from bus and dedicated wake-up pin Supports unshielded bus wires and up to 32 nodes An unpowered node does not disturb the bus lines Battery fail ag on NERR output Simplied Block Diagram
VDD BAT
PIN CONNECTIONS
INH TX RX NERR STB EN WAKE
1 2 3 4 5 6 7 14 13 12 11 10 9 8
BAT GND CANL CANH VDD RTL RTH
STB EN WAKE MODE CONTROL
WAKE-UP LOGIC
INH VDD PROTECTION
12.5k
RTL SLOPE CONTROL & DRIVER CANH CANL RTH
TX
NERR
FAILURE DETECTION
RECEIVER RX MUX
GND
This document contains information on a new product under development. Motorola reserves the right to change or discontinue this product without notice.
O Motorola,Inc
10/12/98 Rev 1.4
MC33388
MAXIMUM RATING Ratings
DC supply voltage pin 10 DC voltage on pins 2, 3, 4, 5, 6 and 7 DC voltage on pins 11, 12 Transient voltage at pins 11, 12 0 < VDD < 5.5V ; VBAT 0 ; t < 500ms Transient voltage on pins 11, 12 (coupled through 1nF capacitor) DC voltage on pin 7 Current in pin 7 DC voltage on pins 1, 8, 9 DC voltage on pins 14 Voltage on pins 14 (Load dump, 500ms) ESD voltage on any pins (HBM.100pF ; 1.5kW) ESD voltage on any pins (MM.200pF ; 0W) Junction temperature Storage temperature RTH, RTL termination resistance
Symbol
VDD VDD VBUS VCANH/VCANL Vtr Vwake I wake Vrtl, Vrth, Vinn VBAT VBAT Vesc Vesc Tj Tstg Rt
Min
-0.3 -0.3 -10 -40 -150
Typ
Max
6 VDD + 0.3 +27 40 100 VBAT +0.3
Unit
V V V V V V mA
-15 -0.3 -0.3 VBAT + 0.3 27 40 -2.0 -200 -40 -55 500 2.0 200 150 150 16000
V V V kV V C C W
THERMAL RATINGS Ratings
Thermal resistance from junction to ambient
Symbol
Rth j/a
Value
120
Unit
C/W
CHARACTERISTICS VDD = 4,75 to 5,25 ; VSTB=VDD ; VBAT=6 to 27V ; Tamb = -40 to 125C unless otherwise specied Conditions
SUPPLY Supply current (recessive) TX = VDD, normal operating mode Supply current (dominant) TX = 0V, no load, normal operating mode Supply current (recessive) TX = VDD, normal operating mode Supply current (receive only) VDD = 5V ; VBAT = 12V ; Tamb < 90C Supply current (VBAT standby) VDD = 5V ; VBAT = 12V ; Tamb < 90C Supply current (sleep) VDD = 0V ; VBAT = 12V ; Tamb < 90C STB, EN, TX Pins High level input voltage 0.7*VDD VDD+0.3V V IVDD 2 3 mA
Symbol
Min
Typ
Max
Unit
IVDD
3.5
5
mA
IBAT
190
300
mA
IVDD + IBAT
0.85
1.2
mA
IVDD + IBAT
15
30
mA mA
IBAT
12
30
MC33388
MOTOROLA
2
MC33388
CHARACTERISTICS VDD = 4,75 to 5,25 ; VSTB=VDD ; VBAT=6 to 27V ; Tamb = -40 to 125C unless otherwise specied Conditions
Low level input voltage High level input current (STB, EN) (Vi = 4V) Low level input current (STB, EN) (Vi = 1V) TX high level input current (Vi = 4V) TX low level input current (Vi = 1V) Forced VBAT standby mode (Fail Safe) Battery voltage for setting power on ag RX, NERR Pins High level output voltage NERR (I0 = -100mA) High level output voltage RX (I0 = -250mA) Low level output voltage (I0 = 1.5mA) WAKE Pin (must be connected to gnd or BAT if not used) Wake up threshold (VSTB = 0V) INH Pin High level voltage Drop (IINH = -0.2mA) Leakage current (Sleep mode ; VINH = 0V) CANH, CANL Pins Differential receiver, threshold voltage (by denition, Vdiff=Vcanh-Vcanl) Differential receiver, dominant to recessive threshold (bus failures 1, 2, 5) CANH recessive output voltage TX = VDD ; R(RTH) < 4k CANL recessive output voltage TX = VDD ; R(RTL) < 4k CANH output voltage, dominant TX = 0V ; I CANH = -40mA ; normal operating mode CANL output voltage, dominant TX = 0V ; I CANL = 40mA ; normal operating mode CANH output current (VCANH = 0 ; TX = 0) CANL output current (VCANL = 14V; TX = 0) Detection threshold for short-circuit to battery voltage (normal mode) Detection threshold for short-circuit to battery voltage (standby/sleep mode) CANH output current (sleep mode ; VCANH = 12V, failure3) VCANH -3.25 -2.65 V Vdrop Il inh 0.8 5 V mA 0.4 VBAT 0.5 VBAT 0.6 VBAT V VDD - 0.9 VDD - 0.9 0 VDD VDD 0.9 V V V I TX I TX VDD VBAT 10 -25 -100 3
Symbol
Min
-0.3
Typ
Max
0.3 * VDD
Unit
V mA mA
20 20 -80 -320
40
-200 -800 4.5 4
mA mA V V
-3.25
-2.65
V
0.2
V
VCANL
VDD - 0.2
V
VCANH
VDD - 1.4
V
VCANL
1.4
V
I CANH I CANL VCANH, VCANL 7.2
75 95 8
100 150 8.7
mA mA V
VCANH
VBAT/2 +3
VBAT /2+5
V
5
mA
MC33388
MOTOROLA
3
MC33388
CHARACTERISTICS VDD = 4,75 to 5,25 ; VSTB=VDD ; VBAT=6 to 27V ; Tamb = -40 to 125C unless otherwise specied Conditions
CANL output current (sleep Mode ; VCANL = 0V ; VBAT = 12V, failure4) CANL wake up voltage threshold CANH wake up voltage threshold Wake up threshold difference CANH single ended receiver threshold (Failures 4, 6, 7) CANL single ended receiver threshold (Failures 3, 8) CANL pull up current (Normal mode, failures 4, 6 and 7) CANH pull down current (Normal mode, failure 3) Receiver differential input impedance CANH / CANL Differential receiver common mode voltage range CANH to ground capacitance CANL to ground capacitance CCANL to CCANH capacitor difference (Absolute value) RTH, RTL Pins RTL to VDD switch on resistance (Iout < -10mA ; Normal operating Mode) RTL to BAT switch series resistance (VBAT Standby mode or sleep mode) RTH to ground Switch On resistance (Iout <10mA ; Normal operating mode) Rrtl 25 50 W Vwake,L Vwake,H VwakeL-VwakeH VCANH VCANL I CANL,pu I CANH,pd Rdiff Vcom CCANH CCANL DCcan 100 -10 10 50 50 10 2.4 1.2 0.2 1.5 2.8 1.85 3.05 75 75 2.15 3.4
Symbol
Min
Typ
0
Max
Unit
mA
3.1 1.9
3.8 2.7
V V V V V mA mA kW V pF pF pF
Rrtl
8
12.5
23
kW
Rrth
25
50
W
Thermal Shutdown
Shutdown Temperature Tsd 165 C
AC Characteristics
CANL and CANH slew rates (10% to 90%). Rising or falling edges Propagation delay TX to RX low (Cload = 10nF) Propagation delay TX to RX high (Cload = 10nF) Min. dominant time for wake-up on CANL or CANH (low power modes ; VBAT = 12V) Min. WAKE time for wake-up (low power modes ; VBAT= 12V) Failure 3 detection time (Normal mode) Failure 6 detection time (Normal mode) Failure 3 recovery time (Normal mode) Failure 6 recovery time (Normal mode) Tpdlow Tpdhigh Twake 8 3.5 5 6.5 V/ms
1 1
2 2 38
ms ms ms ms ms ms ms ms
Twake
8
38
10 50 10 150
60 400 60 1000
MC33388
MOTOROLA
4
MC33388
CHARACTERISTICS VDD = 4,75 to 5,25 ; VSTB=VDD ; VBAT=6 to 27V ; Tamb = -40 to 125C unless otherwise specied Conditions
Failure 4, 7, 8 detection time (Normal mode) Failure 4, 7, 8 recovery time (Normal mode) Failure 3, 4, 7 detection time (Low Power Modes ; VBAT = 12V) Failure 3, 4, 7 recovery time (Low Power Modes ; VBAT = 12V) Min. holdtime go to sleep command Edge count difference between CANH and CANL for failures 1, 2, 5 detection (NERR becomes Low) (Normal Mode) Edge count difference between CANH and CANL for failures 1, 2, 5 recovery (Normal Mode) TX permanent dominant timer disable time (Normal mode and Failure mode) tTX,d 0.75 4 3
Symbol
Min
0.75 10 0.8
Typ
Max
4 60 8
Unit
ms ms ms
2.5
ms
38
ms
3
4
ms
TRUTH TABLE STB
0 0 0
EN
0 0 1
Mode
VBAT Standby1 Sleep2 Go to sleep command Receive only3
INH
High Floating Floating
NERR
RX
RTL
Switched to VBAT
Active LOW wake-up interrupt signal if VDD is present
Switched to VBAT Switched to VBAT
1
0
High
Active LOW VBAT poweron ag Active LOW error ag
Switched to VDD High=receive ; Low=dominant received data
1
1
Normal operation mode
High
Switched to VDD
NOTES: 1. Wake-up interrupts are released when entering normal operating mode. 2. If go to sleep command was used before (EN may turn LOW as Vdd drops, without affecting internal functions because of fail safe functionality. 3. VBAT power-on ag will be reset when entering normal operation mode.
MC33388
MOTOROLA
5
MC33388
Figure 1. Application Schematic
BAT
C2 2 5V Reg LM2935 4 3 C4 1
D1 R4
SWITCH
R3 C3 WAKE RTH
VBAT Vdd INH Vdd C1 MCU MCU PORTx EN STB NERR
R1
MC33388
CANH CANL R2 RTL L1 CAN BUS
CAN MODULE
TX RX
GND
Components Value : R1=R2=R ; R / nb of nodes > 133W R3 : TBD R4 : 22KW 500W4.7uF C3=100nF C4>10uF D1=1N4007 type
MC33388
MOTOROLA
6
MC33388
DEVICE DESCRIPTION Introduction 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 disturbance. 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 failure in order to switch back to normal bus operation as soon as faults disappeared. Bus line slew rates are controlled in order to minimize the RFI, and this allows use of unshielded cables for the bus. In normal operation (no bus failures), RX is the image of the differential bus state. The differential receiver inputs are connected to CANH and CANL through integrated lters. The ltered input signals are also used for the single wire receivers. The CANH and CANL receivers have threshold voltages that assure maximum noise margin in single wire modes. Failure Detector The failure detector is active in normal operation mode and in Receive_only mode. It detects the following single bus failures and switches to an appropriate mode. - Failure # 1: CANH wire interrupted - Failure # 2: CANL wire interrupted - Failure # 3: CANH short-circuited to battery - Failure # 4: CANL short-circuited to ground - Failure # 5: CANH short-circuited to ground - Failure # 6: CANL short-circuited to battery - Failure # 7: CANL mutually shorted to CANH - Failure # 8: CANH short-circuited to VDD The differential receiver threshold is set at -2,8V. This assures a proper reception in the normal operating modes and in case of failures 1, 2 and 5 with noise margin as high as possible. These failures or recovery from them, do not destroy ongoing transmissions. Failures 3 and 6 are detected by comparators respectively connected to CANH and CANL. If the comparator threshold is exceeded for a certain time, the reception is switched to single wire mode. This time is needed to avoid false triggering by external RF elds. Recovery from these failures is detected automatically after a certain time-out (ltering) and no transmission is lost. Failures 4, 7 and 8 initially result in a permanent dominant level at the internal comparator outputs. If failure 4 and 7 appear, the CANL driver and the RTL pin are switched off after a time out, only a weak pull up at RTL remains. Reception continues by switching to single wire mode through CANH. When the failures 4 or 7 are removed, the recessive bus levels are restored. If the receiver voltages remain in the recessive state for a certain time, reception and transmission switch back to the differential mode. If the internal logic recognizes failure 8, the CANH driver is switched off after a time out and the reception is switched to single wire mode through CANL. If the receiver voltages remain in the recessive state for a certain time, reception and transmission switch back automatically to the differential mode. If any of the 8 wiring failure occurs, the output NERR will be made low. On error recovery, NERR will be made high again. During all single wire transmissions, the EMC performance (both immunity and emission) is worse than in differential mode. Integrated receiver lters suppress any HF noise induced into the bus wires. The cut-off frequency of these lters is a compromise between propagation delay and HF suppression. In single wire mode, low frequency noise can not be distinguished from the wanted signal. In the event of a permanent dominant TX state (for more than 2ms) 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. A defect control unit autonomous go to receive only mode. Low power modes The transceiver provides 3 low power modes which can be entered and exited by STB and EN. The mode with the lowest power consumption is the sleep mode. The INH pin is switched to high impedance for desactivation of external voltage regulators. CANL is biassed to the battery voltage via the RTL output. If the VDD voltage is provided, the RX and NERR will signal the wake-up interrupt. The VBAT standby mode will react the same as the sleep mode with an active INH output. In the receive only mode, the transmitter is disabled but the receive part of the device remains active. In this mode, NERR output signals the VBAT power-on ag and RX reports bus activity. Failure detection and management is the same as normal mode. Wake-up requests are recognized by the transceiver, either when a dominant state is detected on either bus lines (remote wake-up) or if the WAKE pin changes its state (local wake-up). Under power-up conditions when VBAT is superior to 5V, the state voltage on the WAKE pin is considered to be the reference state for the wake-up function. On leaving normal mode, the current WAKE pin state becomes the new reference state. On a wake-up request the transceiver will set the INH output which can be used for activation the external VDD voltage regulator. If VDD is provided the wake-up request can be read on the NERR or RX outputs by the microcontroller. To prevent false wake-up due to transients or RF elds, wake-up threshold levels have to be maintained for a certain time. In the low power modes, failure detection circuit remains partly active to prevent increased power consumption in cases of error 3, 4 and 7. Power on After the power VBAT is switched on the INH pin will become high and an internal power-on ag will be set. This ag can be read via the NERR pin (STB=1, EN = 0) and will be reset by entering normal operation mode. The EN and STB will internally be set to low level if the VDD voltage is below a certain threshold to provide fail safe functionality. 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 the major part of the power dissipation, this will result in a reduced power dissipation and hence a lower chip temperature. All other parts of the circuit will remain operating.
MC33388
MOTOROLA
7
MC33388
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
MC33388
MOTOROLA
8

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