AMIS 42671 D

AMIS-42671
High Speed Autobaud CAN
Transceiver
General Description
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PIN ASSIGNMENT
TxD
1
8
AUTB
GND
2
7
CANH
VCC
3
6
CANL
RxD
4
5
VREF
PC20070929.1
(Top View)
Features
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AMIS−
42671
The AMIS−42671 CAN transceiver with autobaud is the interface
between a controller area network (CAN) protocol controller and the
physical bus. It may be used in both 12 V and 24 V systems. The
transceiver provides differential transmit capability to the bus and
differential receive capability to the CAN controller. Due to the wide
common−mode voltage range of the receiver inputs, the AMIS−42671
is able to reach outstanding levels of electromagnetic susceptibility
(EMS). Similarly, extremely low electromagnetic emission (EME) is
achieved by the excellent matching of the output signals.
The AMIS−42671 is primarily intended for industrial network
applications where long network lengths are mandatory. Examples are
elevators, in−building networks, process control and trains. To cope
with the long bus delay the communication speed needs to be low.
AMIS−42671 allows low transmit data rates down 10 kbit/s or lower.
The autobaud function allows the CAN controller to determine the
incoming baud rate without influencing the CAN communication on
the bus.
Fully compatible with the ISO 11898−2 standard
Autobaud function
Wide range of bus communication speed (0 up to 1 Mbit/s)
Allows low transmit data rate in networks exceeding 1 km
Ideally suited for 12 V and 24 V industrial and automotive
applications
Low electromagnetic emission (EME), common−mode choke is no
longer required
Differential receiver with wide common−mode range ($35 V) for
high EMS
No disturbance of the bus lines with an un−powered node
Thermal protection
Bus pins protected against transients
Silent mode in which the transmitter is disabled
Short circuit proof to supply voltage and ground
Logic level inputs compatible with 3.3 V devices
ESD protection for CAN bus at $8 kV
These are Pb−Free Devices*
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2009
January, 2009 − Rev. 3
1
Publication Order Number:
AMIS−42671/D
AMIS−42671
Table 1. TECHNICAL CHARACTERISTICS
Max
Max
Unit
VCANH
Symbol
DC Voltage at Pin CANH
Parameter
0 < VCC < 5.25V; no time limit
Condition
−45
+45
V
VCANL
DC Voltage at Pin CANL
0 < VCC < 5.25V; no time limit
−45
+45
V
Vo(dif)(bus_dom)
Differential Bus Output Voltage in Dominant
State
42.5W < RLT < 60W
1.5
3
V
tpd(rec−dom)
Propagation Delay TxD to RxD
See Figure 7
70
245
ns
tpd(dom−rec)
Propagation Delay TxD to RxD
See Figure 7
100
245
ns
CM−range
Input Common−Mode Range for Comparator
−35
+35
V
VCM−peak
Common−Mode Peak
See Figures 8 and 9 (Note 1)
−500
500
mV
VCM−step
Common−Mode Step
See Figures 8 and 9 (Note 1)
−150
150
mV
Guaranteed differential receiver
threshold and leakage current
1. The parameters VCM−peak and VCM−step guarantee low electromagnetic emission.
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2
AMIS−42671
VCC
AUTB
8
3
Thermal
shutdown
VCC
TxD
Slope
Control
1
7
Driver
control
6
Autobaud
Control
RxD
4
AMIS−42671
COMP
Ri(cm)
Vcc/2
+
VREF
5
Ri(cm)
2
PC20070930.2
Figure 1. Block Diagram
GND
Table 2. PIN DESCRIPTION
Pin
Name
Description
1
TxD
Transmit Data Input; Low Input → Dominant Driver; Internal Pullup Current
2
GND
Ground
3
VCC
Supply Voltage
4
RxD
Receive Data Output; Dominant Transmitter → Low Output
5
VREF
Reference Voltage Output
6
CANL
Low−Level CAN Bus Line (Low in Dominant Mode)
7
CANH
High−Level CAN Bus Line (High in Dominant Mode)
8
AUTB
Autobaud Mode Control Input; Internal Pulldown Current
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3
CANH
CANL
AMIS−42671
Table 3. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Min
Max
Unit
−0.3
+7
V
0 < VCC < 5.25 V;
No Time limit
−45
+45
V
0 < VCC < 5.25 V;
No Time Limit
−45
+45
V
DC Voltage at Pin TxD
−0.3
VCC +
0.3
V
VRxD
DC Voltage at Pin RxD
−0.3
VCC +
0.3
V
VAUTB
DC Voltage at Pin AUTB
−0.3
VCC +
0.3
V
VREF
DC Voltage at Pin VREF
−0.3
VCC +
0.3
V
Vtran(CANH)
Transient Voltage at Pin CANH
Note 2
−150
+150
V
Vtran(CANL)
Transient Voltage at Pin CANL
Note 2
−150
+150
V
Vesd
Electrostatic Discharge Voltage at All Pins
Note 3
Note 4
−4
−500
+4
+500
kV
V
Latch−up
Static Latch−up at all Pins
Note 5
100
mA
Tstg
Storage Temperature
−55
+155
°C
TA
Ambient Temperature
−40
+125
°C
TJ
Maximum Junction Temperature
−40
+150
°C
VCC
Supply Voltage
VCANH
DC Voltage at Pin CANH
VCANL
DC Voltage at Pin CANL
VTxD
Conditions
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
2. Applied transient waveforms in accordance with ISO 7637 part 3, test pulses 1, 2, 3a, and 3b (see Figure 3).
3. Standardized human body model ESD pulses in accordance to MIL883 method 3015.7.
4. Static latch−up immunity: static latch−up protection level when tested according to EIA/JESD78.
5. Standardized charged device model ESD pulses when tested according to EOS/ESD DS5.3−1993.
Table 4. THERMAL CHARACTERISTICS
Symbol
Parameter
Conditions
Value
Unit
Rth(vj−a)
Thermal Resistance from Junction−to−Ambient in SO−8
package
In Free Air
150
k/W
Rth(vj−s)
Thermal Resistance from Junction−to−Substrate of Bare Die
In Free Air
45
k/W
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AMIS−42671
APPLICATION INFORMATION
VBAT
IN
5V−reg
60 W
OUT
VCC
47 nF
VCC
AUTB
CAN
controller
RxD
TxD
3
8
4
7
AMIS−
42671
5
6
1
GND
Figure 2. Application Diagram
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5
CANH
VREF
CAN
BUS
CANL
60 W
2
PC20071001.1
60 W
GND
60 W
47 nF
AMIS−42671
FUNCTIONAL DESCRIPTION
Operating Modes
The behavior of AMIS−42671 under various conditions is
illustrated in Table 5 below. In case the device is powered,
one of two operating modes can be selected through
Pin AUTB.
Table 5. FUNCTIONAL TABLE OF AMIS−42671 WHEN NOT CONNECTED TO THE BUS; x = don’t care
VCC
Pin TxD
Pin AUTB
Pin CANH
Pin CANL
Bus State
Pin RxD
4.75 to 5.25 V
0
0
(or floating)
High
Low
Dominant
0
4.75 to 5.25 V
1
(or floating)
1
VCC/2
VCC/2
Recessive
1
4.75 to 5.25 V
1
(or floating)
x
VCC/2
VCC/2
Recessive
1
VCC < PORL
(unpowered)
x
x
0 V < CANH <
VCC
0V < CANL <
VCC
Recessive
1
>2 V
x
0 V < CANH <
VCC
0V < CANL <
VCC
Recessive
1
PORL < VCC < 4.75 V
High−Speed Mode
Autobaud Mode
If pin AUTB is pulled low (or left floating), the transceiver
is in its high−speed mode and is able to communicate via the
bus lines. The signals are transmitted and received to the
CAN controller via the pins TxD and RxD. The slopes on the
bus line outputs are optimized to give extremely low
electromagnetic emissions.
If Pin AUTB is pulled high, AMIS−42671 is in Autobaud
mode. The transmitter is disabled while the receiver remains
active. All other IC functions also continue to operate.
Normal bus activity can be monitored at the RxD pin and
transmit data on TxD is looped back to RxD without
influencing the CAN communication.
TxD
CANH
CANL
RxD
AUTB
PC20071002.4
Figure 3. Simplified Schematic Diagram of Autobaud Function
Overtemperature Detection
In Autobaud mode the local CAN controller is able to
detect the used communication speed of other transmitting
network nodes. Bus communication is received and via the
RxD pin sent to the CAN controller. If the CAN controller
operates at the wrong baud rate, it will transmit an error
frame. This message will be looped back to the CAN
controller which will increment its error counter. The CAN
controller will be reset with another baud rate. When an
error−free message is received, the correct baud rate is
detected. A logic low may now be applied to Pin AUTB,
returning to the high−speed mode.
A thermal protection circuit protects the IC from damage
by switching off the transmitter if the junction temperature
exceeds a value of approximately 160°C. Because the
transmitter dissipates most of the power, the power
dissipation and temperature of the IC is reduced. All other
IC functions continue to operate. The transmitter off−state
resets when pin TxD goes high. The thermal protection
circuit is particularly necessary when a bus line
short−circuits.
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AMIS−42671
High Communication Speed Range
either positive or negative supply voltage, although power
dissipation increases during this fault condition.
The Pins CANH and CANL are protected from
automotive electrical transients (according to “ISO 7637”;
see Figure 4). Pin TxD is pulled high internally should the
input become disconnected.
The transceiver is primarily intended for industrial
applications. It allows very low baud rates needed for long
bus length applications. But also high speed communication
is possible up to 1 Mbit/s.
Fail−safe Features
A current−limiting circuit protects the transmitter output
stage from damage caused by an accidental short−circuit to
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AMIS−42671
ELECTRICAL CHARACTERISTICS
Definitions
All voltages are referenced to GND (Pin 2). Positive currents flow into the IC. Sinking current means the current is flowing
into the pin; sourcing current means the current is flowing out of the pin.
Table 6. DC CHARACTERISTICS VCC = 4.75 V to 5.25 V, TA = −40°C to +150°C; RLT = 60 W unless specified otherwise.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Dominant; VTXD = 0V
Recessive; VTXD = VCC
25
2
45
4
65
8
mA
SUPPLY (Pin VCC)
ICC
Supply current
TRANSMITTER DATA INPUT (Pin TxD)
VIH
High−Level Input Voltage
Output Recessive
2.0
−
VCC+
0.3
V
VIL
Low−Level Input Voltage
Output Dominant
−0.3
−
+0.8
V
IIH
High−Level Input Current
VTxD = VCC
−1
0
+1
mA
IIL
Low−Level Input Current
VTxD = 0V
−75
−200
−350
mA
Ci
Input Capacitance
Not Tested
−
5
10
pF
MODE SELECT (Pin AUTB)
VIH
High−Level Input Voltage
Autobaud Mode
2.0
−
VCC+
0.3
V
VIL
Low−Level Input Voltage
High−Speed Mode
−0.3
−
+0.8
V
IIH
High−Level Input Current
VS = 2 V
20
30
50
mA
IIL
Low−Level Input Current
VS = 0.8 V
15
30
45
mA
0.6 x
VCC
0.75 x
VCC
Receiver Data Output (Pin RxD)
VOH
High−Level Output Voltage
IRXD = −10 mA
VOL
Low−Level Output Voltage
IRXD = 6 mA
V
0.25
0.45
V
REFERENCE VOLTAGE OUTPUT (Pin VREF)
VREF
Reference Output Voltage
−50 mA < IVREF < +50 mA
0.45 x
VCC
0.50 x
VCC
0.55 x
VCC
V
VREF_CM
Reference Output Voltage for Full Common
Mode Range
−35 V <VCANH< +35 V;
−35 V <VCANL< +35 V
0.40 x
VCC
0.50 x
VCC
0.60 x
VCC
V
BUS LINES (Pins CANH and CANL)
Vo(reces)(CANH)
Recessive Bus Voltage at Pin CANH
VTxD = VCC; no load
2.0
2.5
3.0
V
Vo(reces)(CANL)
Recessive Bus Voltage at Pin CANL
VTxD = VCC; no load
2.0
2.5
3.0
V
Io(reces)(CANH)
Recessive Output Current at Pin CANH
−35 V < VCANH < +35 V;
0 V < VCC < 5.25 V
−2.5
−
+2.5
mA
Io(reces)(CANL)
Recessive Output Current at Pin CANL
−35 V < VCANL < +35 V;
0 V < VCC < 5.25 V
−2.5
−
+2.5
mA
Vo(dom)(CANH)
Dominant Output Voltage at Pin CANH
VTxD = 0 V
3.0
3.6
4.25
V
Vo(dom)(CANL)
Dominant Output Voltage at Pin CANL
VTxD = 0 V
0. 5
1.4
1.75
V
Vo(dif)(bus)
Differential Bus Output Voltage
(VCANH − VCANL)
VTxD = 0 V; Dominant;
42.5 W < RLT < 60 W
1.5
2.25
3.0
V
VTxD = VCC; Recessive;
No load
−120
0
+50
mV
Io(sc) (CANH)
Short Circuit Output Current at Pin CANH
VCANH = 0 V; VTxD = 0 V
−45
−70
−95
mA
Io(sc) (CANL)
Short Circuit Output Current at Pin CANL
VCANL = 36 V; VTxD = 0 V
45
70
120
mA
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AMIS−42671
Table 6. DC CHARACTERISTICS VCC = 4.75 V to 5.25 V, TA = −40°C to +150°C; RLT = 60 W unless specified otherwise.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
BUS LINES (Pins CANH and CANL)
Vi(dif)(th)
Differential Receiver Threshold voltage
−5 V < VCANL < +10 V;
−5 V < VCANH < +10 V;
See
0.5
0.7
0.9
V
Vihcm(dif)(th)
Differential Receiver Threshold Voltage for
High Common−Mode
−35 V < VCANL < +35 V;
−35 V < VCANH < +35 V;
See
0.25
0.7
1.05
V
Vi(dif)(hys)
Differential Receiver Input Voltage Hysteresis
−5 V < VCANL < +10 V;
−5 V < VCANH < +10 V;
See
50
70
100
mV
Ri(cm)(CANH)
Common−Mode Input Resistance at Pin
CANH
15
25
37
kW
Ri(cm)(CANL)
Common−Mode Input Resistance at Pin CANL
15
25
37
kW
Ri(cm)(m)
Matching Between Pin CANH and Pin CANL
Common−Mode Input Resistance
−3
0
+3
%
Ri(dif)
Differential Input Resistance
25
50
75
kW
Ri(cm)(m)
Matching Between Pin CANH and Pin CANL
Common−Mode Input Resistance
−3
0
+3
%
Ri(dif)
Differential Input Resistance
25
50
75
kW
Ci(CANH)
Input Capacitance at Pin CANH
VTxD = VCC; Not Tested
7.5
20
pF
Ci(CANL)
Input Capacitance at Pin CANL
VTxD = VCC; Not Tested
7.5
20
pF
Ci(dif)
Differential Input Capacitance
VTxD = VCC; Not Tested
3.75
10
pF
ILI(CANH)
Input Leakage Current at Pin CANH
VCC = 0 V; VCANH = 5 V
10
170
250
mA
ILI(CANL)
Input Leakage Current at Pin CANL
VCC = 0 V; VCANL = 5 V
10
170
250
mA
VCM−peak
Common−Mode Peak During Transition from
Dom → Rec or Rec → Dom
See Figures 8 and 9
−500
500
mV
VCM−step
Difference in Common−Mode Between
Dominant and Recessive State
See Figures 8 and 9
−150
150
mV
VCANH = VCANL
VCANH = VCANL
POWER−ON−RESET (POR)
PORL
POR Level
CANH, CANL, Vref in
Tri−State Below POR
Level
2.2
3.5
4.7
V
150
160
180
°C
THERMAL SHUTDOWN
TJ(sd)
Shutdown Junction Temperature
TIMING CHARACTERISTICS (see Figures 6 and 7)
td(TxD−BUSon)
Delay TxD to Bus Active
Vs = 0 V
40
85
130
ns
td(TxD−BUSoff)
Delay TxD to Bus Inactive
Vs = 0 V
30
60
105
ns
td(BUSon−RxD)
Delay Bus Active to RxD
Vs = 0 V
25
55
105
ns
td(BUSoff−RxD)
Delay Bus Inactive to RxD
Vs = 0 V
65
100
135
ns
tpd(rec−dom)
Propagation Delay TxD to RxD from
Recessive to Dominant
Vs = 0 V
70
245
ns
td(dom−rec)
Propagation Delay TxD to RxD from Dominant
to Recessive
Vs = 0 V
100
245
ns
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AMIS−42671
MEASUREMENT SETUPS AND DEFINITIONS
+5 V
100 nF
VCC
3
TxD
1 nF
1
AMIS−
42671
RxD
5
4
Transient
Generator
CANL
2
AUTB
VREF
1 nF
6
8
20 pF
CANH
7
PC20071002.3
GND
Figure 4. Test Circuit for Transients
VRxD
High
Low
Hysteresis
0.9
0.5
PC20040829.7
Vi(dif)(hys)
Figure 5. Hysteresis of the Receiver
+5 V
100 nF
VCC
3
TxD
7
1
AMIS−
42671
RxD
4
2
AUTB
RLT
VREF
60 W
6
8
20 pF
5
CANH
CANL
GND
PC20071002.3
Figure 6. Test Circuit for Timing Characteristics
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10
CLT
100 pF
AMIS−42671
HIGH
LOW
TxD
CANH
CANL
dominant
Vi(dif) =
VCANH − VCANL
0.9V
0.5V
recessive
RxD
0.7 x VCC
0.3 x VCC
td(TxD−BUSon)
td(TxD−BUSoff)
td(BUSon−RxD)
tpd(rec−dom)
td(BUSoff−RxD)
tpd(dom−rec)
PC20040829.6
Figure 7. Timing Diagram for AC Characteristics
+5 V
100 nF
VCC
3
7
TxD
6.2 kW
CANH
10 nF
1
AMIS−
42671
Generator
RxD
4
6.2 kW
5
2
8
20 pF
Active Probe
CANL
6
AUTB
30 W
Spectrum Anayzer
30 W
VREF
47 nF
GND
PC20071002.2
Figure 8. Basic Test Setup for Electromagnetic Measurement
CANH
CANL
recessive
VCM−step
VCM =
0.5*(VCANH+VCANL)
VCM−peak
PC20040829.7
VCM−peak
Figure 9. Common−Mode Voltage Peaks (see Measurement Setup Figure 8)
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AMIS−42671
DEVICE ORDERING INFORMATION
Temperature Range
Package Type
Shipping†
AMIS42671ICAB1G
−40°C − 125°C
SOIC−8
(Pb−Free)
96 Tube / Tray
AMIS42671ICAB1RG
−40°C − 125°C
SOIC−8
(Pb−Free)
3000 / Tape & Reel
Part Number
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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AMIS−42671
PACKAGE DIMENSIONS
SOIC 8
CASE 751AZ−01
ISSUE O
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC 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 special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC 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. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC 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 SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC 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 SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
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For additional information, please contact your local
Sales Representative
AMIS−42671/D
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