MICRO-ELECTRONICS TH8055

TH8055
Single Wire CAN Transceiver
Features and Benefits
Fully compatible with J2411 Single Wire CAN specification for Class B in vehicle
communications
30 µA typical power consumption in sleep mode independent from CAN voltage range
Operating voltage range 5…18V
Up to 100 kbps high-speed transmission mode
Up to 40 kbps bus speed
Selective BUS wakeup
Low RFI due to output wave shaping
Fully integrated receiver filter
Bus terminals proof against short-circuits and transients in automotive environment
Loss of ground protection
Protection against load dump, jump start
Thermal overload and short circuit protection
ESD protection of 4 kV on CAN pin (2kV on any other pin)
Under- and over voltage lock out
Bus dominant timeout feature
Ordering Information
Part No.
Temperature Suffix
Package
TH8055
J (-40 ….125 °C)
DC (SOIC 150mil)
General Description
The TH8055 is a physical layer device for a single wire
data link capable of operating with various CSMA/CR
protocols such as the Bosch Controller Area Network
(CAN) version 2.0. This serial data link network is
intended for use in applications where high data rate is
not required and a lower data rate can achieve cost
reductions in both the physical media components and
in the microprocessor and/or dedicated logic devices
which use the network.
The network shall be able to operate in either the
normal data rate mode or a high speed data download
mode for assembly line and service data transfer
operations. The high speed mode is only intended to be
390108055
Rev. 1.1a
operational when the bus is attached to an off-board service
node. This node shall provide temporary bus electrical loads
which facilitate higher speed operation. Such temporary
loads shall be removed when not performing download
operations.
The bit rate for normal communications is typically 33 kbit/s,
for high speed transmissions like described above a typical
bit rate of 83 kbit/s is recommended. The TH8055 is
designed in accordance to the Single Wire CAN Physical
Layer Specification GMW3089 V1.4 and supports many
additional features like undervoltage lockout , timeout for
faulty blocked input signals, output blanking time in case of
bus ringing and a very low sleep mode current.
Page 1 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Functional Diagram
VBAT
TH8055
5V Supply
and
References
Biasing and
VBAT Monitor
Reverse
Current
Protection
RC-Osc
Wave Shaping
TxD
CANH
CAN Driver
Time Out
Feedback
Loop
Input Filter
MODE0
LOAD
MODE
CONTROL
MODE1
Receive
Comparator
Loss of
Ground
Detection
RxD
RxD Blanking
Time Filter
Reverse
Current
Protection
GND
Figure 1- Block Diagram
390108055
Rev. 1.1a
Page 2 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Functional Description
TxD Input Pin - Logic command to transmit on the single wire CAN bus as follows:
TxD Polarity
TxD = logic 1 (or floating) on this pin produce an
undriven or recessive bus state (low bus
voltage)
TxD = logic 0 on this pin produce either a bus
normal or a bus high voltage dominant state
depending on the transceiver mode state (high
bus voltage)
If the TxD pin is driven to a logic low state while the
sleep mode (Mode0=0 and Mode1=0) is activated,
the transceiver not drive the CANH pin to the
dominant state.
Mode 0 and Mode 1 pins - are used to select
The transceiver provides a weak internal pull down
current on each of these pins which causes the
transceiver to default to sleep mode when they are
not driven. The mode input signals are standard
CMOS logic level.
M0
M1
L
L
Sleep mode
H
L
High speed mode
L
H
Wake up
H
H
Normal mode
Timeout Feature
In case of a faulty blocked dominant TxD input
signal the CANH output is switched off automatically
after the specified TxD timeout reaction time to
prevent a dominant bus.
The transmission is continued by next TxD L to H
transition without delay.
transceiver operating modes:
Characteristics). High speed communications shall
utilize the normal mode signal voltage levels as
specified in Static Characteristics.
Wake Up Mode
This bus includes a selective node awake capability,
which allows normal communication to take place
among some nodes while leaving the other nodes in
an undisturbed sleep state. This is accomplished by
controlling the signal voltages such that all nodes
must wake up when they receive a higher voltage
message signal waveform. The communication
system communicates to the nodes information as to
which nodes are to stay operational (awake) and
which nodes are to put themselves into a non
communicating
low
power
“sleep”
state.
Communication at the lower, normal voltage levels
shall not disturb the sleeping nodes.
Mode
Sleep Mode
Transceiver is in low power state, waiting for wake
up via high voltage signal or by mode pins change to
any state other than 0,0. In this state, the CANH pin
is not in the dominant state regardless of the state of
the TxD pin.
High Speed Mode
This mode allows high speed download with bitrates
up to 100Kbit/s. The output waveshaping circuit is
disabled in this mode. Bus transmitter drive circuits
for those nodes which are required to communicate
in high speed mode are able to drive reduced bus
resistance in this mode (see Table Static
390108055
Rev. 1.1a
The transceiver provides an internal pull up current
on the TxD pin which will cause the transmitter to
default to the bus recessive state when TxD is not
driven.
TxD input signals are standard CMOS logic levels.
Normal mode
Transmission bit rate in normal communication is 33
Kbits/s. In normal transmission mode the TH8055
supports controlled waveform rise and overshoot
times. Waveform trailing edge control is required to
assure that high frequency components are
minimized at the beginning of the downward voltage
slope. The remaining fall time occurs after the bus
is inactive with drivers off and is determined by the
RC time constant of the total bus load.
Page 3 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
RxD Output pin - Logic data as sensed on the single wire CAN bus
pin signalised an interrupt (logic 0). However, if the
Mode 0 & 1 pins are at logic 0, the transceiver
returns to the sleep condition when the wake up bus
voltage signal is not present.
When not in sleep mode all valid bus signals will be
sent out on the RxD pin.
RxD will be placed in the undriven or off state when
in sleep mode .
RxD polarity
RxD = logic 1 on this pin indicates a bus
recessive state (low bus voltage)
RxD = logic 0 on this pin indicates a bus
normal or high voltage bus dominant state
RxD in Sleep Mode
RxD do not pass signals to the micro processor
while in sleep mode until a valid wake up bus
voltage level is received or the Mode 0,1 pins are
not 0,0 respectively. When the valid wake up bus
voltage signal awakens the transceiver, the RxD
RxD Typical Load
Resistance: 2.5 kohms
Capacitance: < 25 pF
Bus LOAD pin - Resistor ground with internal open-on-loss-of-ground protection
When the ECU experiences a loss of ground
condition, this pin switch to a high impedance state.
The ground connection through this pin is not
interrupted in any transceiver operating mode
including the sleep mode. The ground connection
only is interrupted when there is a valid loss of
ground condition.
This pin provides the bus load resistor with a path to
ground which contributes less than 0.1 volts to the
bus offset voltage when sinking the maximum
current through one unit load resistor.
The transceiver’s maximum bus leakage current
contribution to VOL from the LOAD pin when in a
loss of ground state is 50uA over all operating
temperatures and 3.5 < VBAT < 18 volts .
VBAT INPUT pin - Vehicle Battery Voltage
The transceiver is fully operational as described in
Table Static Characteristics over the range 5 < VBAT
< 18 volts as measured between the GND pin and
the VBAT pin.
390108055
Rev. 1.1a
For 0 < VBAT < 5 volts, the bus is passive (not be
driven dominant) and RxD is undriven (high),
regardless of the state of the TxD pin (undervoltage
lockout).
Page 4 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
CAN BUS input/output pin
Wave Shaping in normal and wake up mode
Loss of ground
Wave shaping is incorporated into the transmitter to
minimize EMI radiated emissions. An important
contributor to emissions is the rise and fall times
during output transitions at the “corners” of the
voltage waveform. The resultant waveform is one
half of a sin wave of frequency 50 - 65 kHz at the
rising waveform edge and one quarter of this sin
wave at falling or trailing edge.
If the CANH voltage decreases under the specified
value below the ECU - ground, the LOAD pin is
switched into high impedance state. The CANH
transmission is continued until the undervoltage lock
out voltage threshold is detected.
Wave Shaping in high speed mode
Wave shaping control of the rising
waveform edges are disabled during
mode. EMI emissions requirements
during this mode. The waveform rise
mode is less than one µs.
and falling
high speed
are waived
time in this
Loss of battery
In case of loss of battery (VBAT = 0 or open) the
transceiver do not disturb bus communication. The
maximum reverse current into power supply system
doesn‘t exceed 500µA.
Short circuits
If the CAN BUS pin is shorted to ground for any
duration of time, an over temperature shut down
circuit disables the output high side drive source
transistor before the local die temperature exceeds
the damage limit threshold.
390108055
Rev. 1.1a
Page 5 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Electrical Specification
All voltages are referenced to ground (GND).
Positive currents flow into the IC. The absolute
maximum ratings given in the table below are
limiting values that do not lead to a permanent
damage of the device but exceeding any of these
limits may do so. Long term exposure to limiting
values may affect the reliability of the device.
Reliable operation of the TH8055 is only specified
within the limits shown in ”Operating conditions”.
Operating Conditions
Parameter
Symbol
Min
Max
Unit
VBAT
5.0
18
V
Operating ambient temperature
TA
-40
125
°C
Junction temperature
TJ
-40
150
°C
Battery voltage
Absolute Maximum Ratings
Parameter
Supply voltage
Symbol
Condition
VBAT
Short-term supply voltage
VBAT.LD
Transient supply voltage
VBAT.TR1
ISO 7637/1 pulse 1
[1]
ISO 7637/1 pulses 3A, 3B
VBAT=0
VCANHTR2
Transient bus voltage
VCANHTR3
DC voltage on pin LOAD
DC voltage on pins TxD,MODE1,MODE0,RxD
ESD capability of CANH
ESD capability of any other pins
Maximum latch-up free current at any Pin
Maximum power dissipation
VLOAD
V
ISO 7637/1 pulse 1
-50
[1]
VBAT.TR3
Transient bus voltage
18
27
Transient supply voltage
VCANHTR1
-0.3
Jump start; t<1 min
ISO 7637/1 pulses 2
Transient bus voltage
Unit
40
VBAT.TR2
VCANH
Max
Load dump; t<500ms
Transient supply voltage
CANH voltage
Min
ISO 7637/1 pulses 2
100
V
-200
200
V
-20
40
V
[2]
via RT > 2k
VDC
V
100
V
-200
200
V
[2]
ISO 7637/1 pulses 3A, 3B
V
-50
[2]
V
-40
40
V
-0.3
7
V
VESDBUS
Human body model
Equivalent to discharge 100pF
with 1.5k
-4000
4000
V
VESD
Human body model
Equivalent to discharge 100pF
with 1.5k
-2000
2000
V
-500
500
mA
197 [3]
mW
152
K/W
ILATCH
Ptot
At TA = 125 °C
Thermal impedance
JA
in free air
Storage temperature
TSTG
-55
150
°C
Junction temperature
TJ
-40
150
°C
[1]
ISO 7637 test pulses are applied to VBAT via a reverse polarity diode and >1uF blocking capacitor .
ISO 7637 test pulses are applied to CANH via a coupling capacitance of 1 nF.
[3]
The application board shall be realized with a ground copper foil area > 25mm2 .
[2]
390108055
Rev. 1.1a
Page 6 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Static Characteristics
VBAT = 5.0 to 18V, TA = -40 to +125°C, unless otherwise specified
All voltages are refered to ground, positive currents flow into the IC.
Parameter
Symbol
Condition
Min
Typ
Max
Unit
VBAT
5.0
12
18
V
Undervoltage lock out
VBATUV
4.5
4.95
V
Overvoltage lock out
VBATOV
18.5
21
V
Normal mode supply current, dominant
IBATNd
VBAT = 18V
MODE0=MODE1=H, TxD=L,
noload
3.5
5
mA
Normal mode supply current, recessiv
IBATNr
VBAT = 18V
MODE0=MODE1=H, TxD open
3.5
5
mA
Wake up mode supply current
IBATW
VBAT = 18V
MODE0=L,MODE1=H, TxD=L
4
5
mA
Sleep mode supply current
IBATS
VBAT = 18V
TxD, RxD, MODE0, MODE1
open
30
60
µA
PIN VBAT
Operating supply voltage
PIN CANH
VOH
RL > 100Ω
Normal, high speed mode
5.5V < VBAT < 18V
3.5
4.55
V
Fixed wakeup output high voltage
VOHWUFix
Wake-up mode, RL>270Ω
11.2V < VBAT < 18V
9.7
12
V
Offset wakeup output high voltage
VOHWUOffs
Wake-up mode, RL>270Ω
5.5V < VBAT < 11.2V
VBAT -1.5
VBAT
V
0.20
V
40
150
mA
Bus output voltage
Recessive state output voltage
Bus short circuit current
VOL
Recessive state or sleep mode,
Rload = 9.1 kΩ,
ICANSHORT VCANH = 0V, VBAT=18V, TxD=0V
Bus leakage current during loss of ground [1]
ILKNCAN
Loss of ground, VCANH=0V
-50
10
µA
Bus leakage current, bus positive
ILKPCAN
TxD high
-10
10
µA
Normal, high-speed mode
1.8
2.2
V
Fixed wakeup input high voltage threshold [2]
VIHWUFix Sleep mode VBAT > 11.2V
6.15
8.1
V
Offset wakeup input high voltage threshold [2]
VIHWUOffs Sleep mode
VBAT -4.3
VBAT -3.25
V
Maximum reverse current into CANH
ICANHOVlob VCANH > VBAT
1
mA
Loss of ground detection threshold
VCANHLOG TxD open
-200
mV
0.5
V
Bus input threshold
VIH
-1600
PIN LOAD
Voltage on switched ground pin
390108055
Rev. 1.1a
VLOAD
IRTH = 5mA
Page 7 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Parameter
Symbol
Condition
Min
Typ
Max
Unit
PIN TXD,MODE0,MODE1
High level input voltage
VIH
Low level input voltage
VIL
TxD pull up current
MODE0 and 1 pull down current
IIL_TXD
3.4
TxD=L, MODE0 and 1=H
IIH_MODE0 MODE0 and 1=H
V
1.6
V
20
50
µA
15
50
µA
0.4
V
10
µA
70
mA
PIN RXD
Low level output voltage
VOLRxD
IRxD = 2mA
High level output leakage
IIHRxD
VRxD=5V
RxD output current
IRxD
VRxD=5V
-10
Overtemperature protection
Thermal shutdown [3]
TSD
155
180
°C
Thermal recovery [3]
TREC
130
150
°C
[1]
[2]
[3]
Leakage current in case of Loss of ground is the summary of both currents ILKN_CAN and ILKN_RTH .
Wake up is detected at the minimum of VihWuFix or VihWuOffset.
thresholds not tested in production, guaranteed by design, only switch on/off tested
390108055
Rev. 1.1a
Page 8 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Dynamic Characteristics
All dynamic values of the table below refer to the timing diagrams on page 6.
(5.5V ≤ VBAT ≤ 18V, -40°C ≤ TA ≤ 125°C, unless otherwise specified)
Parameter
Symbol
Condition
Min
Max
Unit
tT
max. and min bus load, 50%
TXD high level to VCANH=2.2V
3
6.3
µs
Transmit delay in high-speed mode
tTHS
max. and min bus load, 50%
TXD high level to VCANH=2.2V
0.2
1.5
µs
Receive delay in all active modes
tDR
CANH to RxD, VCANH=2V ,
RxD=L to H
0.3
1
µs
Receive delay in all active modes
tRD
CANH to RxD, VCANH=2V ,
RxD=L to H
0.3
1
µs
Input minimum pulse length, all active modes
trp
CANH to RxD, VCANH=2V ,
RxD=H to L
0.2
1
µs
Input minimum pulse length, all active modes
tpr
CANH to RxD, VCANH=2V ,
RxD=L to H
0.2
1
µs
Bus output rise time (30%-70%)
tR
Normal mode, max. and min
bus loads,VBAT=12V
0.6
1.4
µs
Bus output fall time (70%-30%)
tF
Normal mode, max. and min
bus loads, VBAT=12V
1.3
4.7
µs
Bus output rise time (30%-70%)
tRHS
High-speed mode, max. and
min. bus loads, VBAT=12V
0.5
µs
Bus output fall time (70%-30%)
tFHS
High-speed mode, max. and
min. bus loads, VBAT=12V
1.6
2.5
µs
Wakeup filter time delay
tWUF
See Timing diagrams
10
70
µs
Receive blanking time after TxD L-H transition
tRB
See Timing diagrams
2
6
µs
Transmit delay in normal and wake up mode
TxD timeout reaction time
TxD timeout reaction time
tTOUT
Normal and high speed mode
tTOUTWA Wake up mode
Typ
12
ms
20
ms
Delay from normal to high speed modes
tDNHS
30
µs
Delay from normal to wake up mode
tDNHV
30
µs
Delay from normal to sleep modes
tDNS
500
µs
Delay from sleep to normal and wake up mode
tdsnwu
50
µs
390108055
Rev. 1.1a
Page 9 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Bus loading requirements
Parameter
Symbol
Min
Number of system nodes
Typ
Max
2
Network distance between any two ECU nodes
Unit
32
Bus length
60
m
Node series Inductor Resistance
Rind
2.3
Ω
EMC Inductor voltage drop
Vind
0.3
V
Ground offset voltage
Vgoff
0.8
V
Device capacitance (unit load)
Cul
198
242
pF
Network total capacitance
Ctl
396
13700
pF
Device resistance (unit load)
Rul
9009
9191
Ω
Device resistance (min load)
Rmin
2000
Network total resistance
Rtl
270
4596
Ω
Network time constant [1]
τ
1
4
µs
Rload
100
185
Ω
High speed mode network resistance to GND
220
9100
Ω
Timing Diagrams
VTxD
50%
t
tT
VCANH
70%
30%
t
tR
tF
tD
tDR
VRxD
50%
t
Figure 2 - Input/Output Timing
[1]
The network time constant incorporates the bus wiring capacitance. The minimum value is selected to limit radiated
emission. The maximum value is selected to ensure proper communication modes. Not all combinations of R and C are
possible.
390108055
Rev. 1.1a
Page 10 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
VCANH
VIHWU
VIH
t
tWU
twu
tWUF
VRxD
wake up
interrupt
tWU < tWUF
t
Figure 3 - Wake Up Filter Time Delay
VTxD
50%
t
VCANH
Vih
t
VRxD
50%
t
tRB
Figure 4 - Receive Blanking Time
390108055
Rev. 1.1a
Page 11 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Application Circuitry
1N4001
VBAT
2.2uF
Voltage regulator
100nF
VBAT
+5V
ECU connector to
Single Wire CAN Bus
2.5kOhm
VBAT
5
4
47µH
CAN controller
RxD
7
CANH
TH8055
2
9.1kOhm
220pF
MODE0
3
6
MODE1
1
LOAD
8
TxD
Copper Foil
Heat Sink
>25mm2
ESD Protection TPSMA16A or
MMBZ27VCLT1 or
equivalent - if needed
GND
Figure 5 - Application Circuitry
VBAT
100nF
47µH
CANH
9.1k; 1%
VBAT
220pF
100nF
RTH
CANH
RX0
CAN
Controller
EN
NSTB
CAN
Controller
EN
TH8055
9.1k; 1%
220pF
RTH
NSTB
TX0
RX0
CAN-Bus
Line
TX0
47µH
TH8055
Figure 6 - CAN Network Circuitry
390108055
Rev. 1.1a
Page 12 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Pin Description
TxD
1
8
GND
MODE0
2
7
CANH
MODE1
3
6
LOAD
RXD
4
5
VBAT
TH8055
Pin
Name
IO-Typ
1
TXD
I
Transmit data from core to CAN
2
MODE0
I
Operating mode select input 0
3
MODE1
I
Operating mode select input 1
4
RXD
O
Receive data from CAN to core
5
VBAT
Battery input voltage
6
LOAD
Resistor load (loss of ground low side switch )
7
CANH
8
GND
390108055
Rev. 1.1a
I/O
Description
Single wire CAN bus pin
Ground
Page 13 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Mechanical Specification
E
H
A1
A
1 2 3
D
α
L
b
e
Small Outline Integrated Circiut (SOIC), SOIC8 NB, 150 mil
All Dimension in mm, coplanarity < 0.1 mm
min
max
D
E
H
A
A1
e
b
L
α
4.85.0
3.80
4.00
10.00
10.65
5.80
6.20
0.10
0.25
1.27
0.33
0.51
0.40
1.27
0°8°
0.10
0.053
0.069
0.004
0.010
0.050
0.013
0.020
0.016
0.050
0°
8°
All Dimension in inch, coplanarity < 0.004”
min
max
390108055
Rev. 1.1a
0.189
0.197
0.150
0.157
0.228
0.244
Page 14 of 15
Jan 2002
TH8055
Single Wire CAN Transceiver
Your notes
Important Notice
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis
makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of
the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without
notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product
is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental
requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not
recommended without additional processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third
party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or
indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use
of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering of
technical or other services.
© 2000 Melexis NV. All rights reserved.
For the latest version of this document. Go to our website at
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan:
Phone: +32 1367 0795
E-mail: [email protected]
All other locations:
Phone: +1 603 223 2362
E-mail: [email protected]
QS9000, VDA6.1 and ISO14001 Certified
390108055
Rev. 1.1a
Page 15 of 15
Jan 2002