AMIS-42670
High-Speed CAN
Transceiver for Long
Networks
Description
The AMIS−42670 CAN transceiver is the interface between a
controller area network (CAN) protocol controller and the physical
bus and 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−42670
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−42670 is the industrial version of the AMIS−30660 and
primarily intended for 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−42670 allows low transmit data rates
down 10 kbit/s or lower.
Features
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PIN ASSIGNMENT
TxD
GND
V
CC
RxD
1
2
3
4
8
7
6
5
S
CANH
CANL
V
REF
(Top View)
AMIS−
42670
PC20041204.3
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Fully Compatible with the ISO 11898−2 Standard
Certified “Authentication on CAN Transceiver Conformance (d1.1)”
Wide Range of Bus Communication Speed (0 Mbit/s 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 Unpowered 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
These are Pb−Free Devices*
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 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−42670/D
AMIS−42670
Table 1. TECHNICAL CHARACTERISTICS
Symbol
V
CANH
V
CANL
V
o(dif)(bus_dom)
t
pd(rec−dom)
t
pd(dom−rec)
C
M−range
V
CM−peak
V
CM−step
Parameter
DC Voltage at Pin CANH
DC Voltage at Pin CANL
Differential Bus Output Voltage in
Dominant State
Propagation Delay TxD to RxD
Propagation Delay TxD to RxD
Input Common−Mode Range for
Comparator
Common−Mode Peak
Common−Mode Step
Condition
0 < V
CC
< 5.25 V; no time limit
0 < V
CC
< 5.25 V; no time limit
42.5
W
< R
LT
< 60
W
See Figure 6
See Figure 6
Guaranteed Differential Receiver Threshold
and Leakage Current
See Figures 7 and 8 (Note 1)
See Figures 7 and 8 (Note 1)
Max
−45
−45
1.5
70
100
−35
−500
−150
Max
+45
+45
3
245
245
+35
500
150
Unit
V
V
V
ns
ns
V
mV
mV
1. The parameters V
CM−peak
and V
CM−step
guarantee low electromagnetic emission.
V
CC
S
8
V
CC
3
Thermal
Shutdown
TxD
Driver
Control
1
7
6
CANH
CANL
AMIS−42670
RxD
V
REF
4
COMP
R
i(cm)
+
V
cc
/
2
5
R
i(cm)
2
PD20070831.4
GND
Figure 1. Block Diagram
Table 2. PIN DESCRIPTION
Pin
1
2
3
4
5
6
7
8
Name
TxD
GND
V
CC
RxD
V
REF
CANL
CANH
S
Description
Transmit Data Input; Low Input
→
Dominant Driver; Internal Pullup Current
Ground
Supply Voltage
Receive Data Output; Dominant Transmitter
→
Low Output
Reference Voltage Output
Low−Level CAN Bus Line (Low in Dominant Mode)
High−Level CAN Bus Line (High in Dominant Mode)
Silent Mode Control Input; Internal Pulldown Current
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2
AMIS−42670
Table 3. ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
CANH
V
CANL
V
TxD
V
RxD
V
S
V
REF
V
tran(CANH)
V
tran(CANL)
V
esd
Latch−up
T
stg
T
A
T
J
Supply Voltage
DC Voltage at Pin CANH
DC Voltage at Pin CANL
DC Voltage at Pin TxD
DC Voltage at Pin RxD
DC Voltage at Pin S
DC Voltage at Pin V
REF
Transient Voltage at Pin CANH
Transient Voltage at Pin CANL
Electrostatic Discharge Voltage at All Pins
Static Latch−up at All Pins
Storage Temperature
Ambient Temperature
Maximum Junction Temperature
Note 2
Note 2
Note 3
Note 5
Note 4
−55
−40
−40
0 < V
CC
< 5.25 V; no time limit
0 < V
CC
< 5.25 V; no time limit
Parameter
Conditions
Min.
−0.3
−45
−45
−0.3
−0.3
−0.3
−0.3
−150
−150
−4
−750
Max.
+7
+45
+45
V
CC
+ 0.3
V
CC
+ 0.3
V
CC
+ 0.3
V
CC
+ 0.3
+150
+150
+4
+750
100
+155
+125
+150
Unit
V
V
V
V
V
V
V
V
V
kV
V
mA
°C
°C
°C
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
R
th(vj−a)
R
th(vj−s
)
Parameter
Thermal Resistance from Junction−to−Ambient in
SOIC−8 Package
Thermal Resistance from Junction−to−Substrate
of Bare Die
Conditions
In Free Air
In Free Air
Value
150
45
Unit
k/W
k/W
APPLICATION INFORMATION
VBAT
IN
5V−
reg
OUT
V
CC
S
3
8
4
1
2
7
60
W
V
CC
CANH
VREF
CANL
60
W
GND
60
W
47 nF
CAN
controller
RxD
TxD
AMIS−
42670
5
6
CAN
BUS
60
W
47 nF
PC20070831.3
GND
Figure 2. Application Diagram
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3
AMIS−42670
FUNCTIONAL DESCRIPTION
Operating Modes
The behavior of AMIS−42670 under various conditions is
illustrated in Table 3 below. In case the device is powered,
one of two operating modes can be selected through Pin S.
Table 5. FUNCTIONAL TABLE OF AMIS−42670; x = don’t care
VCC
4.75 V to 5.25 V
4.75 V to 5.25 V
4.75 V to 5.25 V
V
CC
< PORL
(Unpowered)
PORL < V
CC
< 4.75 V
Pin TxD
0
x
1
(or Floating)
x
>2V
Pin S
0
(or Floating)
1
X
X
X
Pin CANH
High
V
CC
/2
V
CC
/2
0 V < CANH < V
CC
0 V < CANH < V
CC
Pin CANL
Low
V
CC
/2
V
CC
/2
0 V < CANL < V
CC
0 V < CANL < V
CC
Bus State
Dominant
Recessive
Recessive
Recessive
Recessive
Pin RxD
0
1
1
1
1
High−Speed Mode
If Pin S 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.
Silent Mode
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.
High Communication Speed Range
In silent mode, the transmitter is disabled. All other IC
functions continue to operate. The silent mode is selected by
connecting Pin S to V
CC
and can be used to prevent network
communication from being blocked, due to a CAN
controller which is out of control.
Over−temperature Detection
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 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
A current−limiting circuit protects the transmitter output
stage from damage caused by an accidental short−circuit to
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 3). Pin TxD is pulled high internally should the
input become disconnected.
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4
AMIS−42670
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
V
CC
= 4.75 V to 5.25 V, T
A
=
−40°C
to +150°C; R
LT
= 60
W
unless specified otherwise.
Symbol
SUPPLY
(Pin V
CC
)
I
CC
Supply Current
Dominant; V
TXD
= 0V
Recessive; V
TXD
= V
CC
25
2
45
4
65
8
mA
Parameter
Conditions
Min
Typ
Max
Unit
TRANSMITTER DATA INPUT
(Pin TxD)
V
IH
V
IL
I
IH
I
IL
C
i
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
REF
V
REF_CM
High−Level Input Voltage
Low−Level Input Voltage
High−Level Input Current
Low−Level Input Current
Input Capacitance
Output Recessive
Output Dominant
V
TxD
= V
CC
V
TxD
= 0 V
Not Tested
2.0
−0.3
−1
−75
−
−
−
0
−200
5
V
CC
+
0.3
+0.8
+1
−350
10
V
V
mA
mA
pF
MODE SELECT
(Pin S)
High−Level Input Voltage
Low−Level Input Voltage
High−Level Input Current
Low−Level Input Current
Silent Mode
High−Speed Mode
V
S
= 2 V
V
S
= 0.8 V
I
RXD
=
−10
mA
I
RXD
= 6 mA
0.45 x
V
CC
0.40 x
V
CC
2.0
−0.3
20
15
−
−
30
30
V
CC
+
0.3
+0.8
50
45
V
V
mA
mA
RECEIVER DATA OUTPUT
(Pin RxD)
High−Level Output Voltage
Low−Level Output Voltage
0.6 x
V
CC
0.75 x
V
CC
0.25
0.45
V
V
REFERENCE VOLTAGE OUTPUT
(Pin V
REF
)
Reference Output Voltage
Reference Output Voltage for Full Common
Mode Range
−50
mA
< I
VREF
< +50
mA
−35
V < V
CANH
< +35 V;
−35
V < V
CANL
< +35 V
0.50 x
V
CC
0.50 x
V
CC
0.55 x
V
CC
0.60 x
V
CC
V
V
BUS LINES
(Pins CANH and CANL)
V
o(reces)(CANH)
V
o(reces)(CANL)
I
o(reces)(CANH)
I
o(reces)(CANL)
V
o(dom)(CANH)
V
o(dom)(CANL)
V
o(dif)(bus)
Recessive Bus Voltage at Pin CANH
Recessive Bus Voltage at Pin CANL
Recessive Output Current at Pin CANH
Recessive Output Current at Pin CANL
Dominant Output Voltage at Pin CANH
Dominant Output Voltage at Pin CANL
Differential Bus Output Voltage
(V
CANH
−
V
CANL
)
V
TxD
= V
CC
; No Load
V
TxD
= V
CC
; No Load
−35
V < V
CANH
< +35 V;
0 V < V
CC
< 5.25 V
−35
V <V
CANL
< +35 V;
0 V <V
CC
< 5.25 V
V
TxD
= 0 V
V
TxD
= 0 V
V
TxD
= 0 V; Dominant;
42.5
W
< R
LT
< 60
W
V
TxD
= V
CC
; Recessive;
No Load
I
o(sc)(CANH)
I
o(sc)(CANL)
Short Circuit Output Current at Pin CANH
Short Circuit Output Current at Pin CANL
V
CANH
= 0 V; V
TxD
= 0 V
V
CANL
= 36 V; V
TxD
= 0 V
2.0
2.0
−2.5
−2.5
3.0
0. 5
1.5
−120
−45
45
2.5
2.5
−
−
3.6
1.4
2.25
0
−70
70
3.0
3.0
+2.5
+2.5
4.25
1.75
3.0
+50
−95
120
V
V
mA
mA
V
V
V
mV
mA
mA
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