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AMIS-42675 High Speed Low Power CAN Transceiver for Long Wire Networks
Description
The AMIS-42675 CAN transceiver 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-42675 is able to reach outstanding levels of electro-magnetic susceptibility (EMS). Similarly, extremely low electromagnetic emission (EME) is achieved by the excellent matching of the output signals. The AMIS-42675 is the industrial version of the AMIS-42665 and primarily 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-42675 allows low transmit data rates down 10 Kbit/s or lower. The AMIS-42675 is the low power member of the CAN high-speed transceiver family and offers the following additional features:
Features
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PIN ASSIGNMENT
TxD GND VCC RxD
1 2 3 4
8 7 6 5
STB CANH CANL VSPLIT
(Top View)
AMIS- 42675
PC20041204.3
* * * * * * * * * *
Ideal Passive Behavior When Supply Voltage is Removed Wake-up Over Bus Extremely Low Current Standby Mode Compatible With the ISO 11898 standard (ISO 11898-2, ISO 11898-5 and SAE J2284) Wide Range of Bus Communication Speed (0 up to 1 Mbit/s) Ideally Suited for 12 V and 24 V Industrial and Automotive Applications Allows Low Transmit Data Rate in Networks Exceeding 1 km Extremely Low Current Standby Mode with Wake-up via the Bus Low Electromagnetic Emission (EME): Common-Mode Choke is No Longer Required Differential Receiver with Wide Common-Mode Range ($35 V) for High EMS
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.
* Voltage Source via VSPLIT Pin for Stabilizing the
Node
* No Disturbance of the Bus Lines with an Unpowered * Thermal Protection * Bus Pins Protected Against Transients * Power Down Mode in Which the Transmitter is * * * *
Recessive Bus Level (Further EMC Improvement)
Disabled Bus and VSPLIT Pins Short Circuit Proof to Supply Voltage and Ground Logic Level Inputs Compatible with 3.3 V Devices At Least 110 Nodes can be Connected to the Same Bus These are Pb-Free Devices*
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
(c) Semiconductor Components Industries, LLC, 2008
December, 2008 - Rev. 2
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Publication Order Number: AMIS-42675/D
AMIS-42675
Table 1. TECHNICAL CHARACTERISTICS
Symbol VCC VSTB VTxD VRxD VCANH VCANL VSPLIT VO(dif)(bus_dom) CM-range VCM-peak Cload tpd(rec-dom) tpd(dom-rec) VCM-step Tjunc Parameter Power Supply Voltage DC Voltage at Pin STB DC Voltage at Pin TxD DC Voltage at Pin RxD DC Voltage at Pin CANH DC Voltage at Pin CANL DC Voltage at Pin VSPLIT Differential Bus Output Voltage in Dominant State Input Common-Mode Range for Comparator Common-Mode Peak Load Capacitance on IC Outputs Propagation Delay TxD to RxD Propagation Delay TxD to RxD Common-Mode Step Junction Temperature See Figure 4 See Figure 4 Note 1 70 100 -150 -40 0 < VCC < 5.25 V; No Time Limit 0 < VCC < 5.25 V; No Time Limit 0 < VCC < 5.25 V; No Time Limit 42.5 W < RLT < 60 W Guaranteed Differential Receiver Threshold and Leakage Current Note 1 Condition Max 4.75 -0.3 -0.3 -0.3 -35 -35 -35 1.5 -35 -500 Max 5.25 VCC VCC VCC +35 +35 +35 3 +35 500 15 230 245 150 150 Unit V V V V V V V V V mV pF ns ns mV C
1. The parameters VCM-peak and VCM-step guarantee low EME.
VCC
VCC
AMIS-42675
3 POR 7
TxD
1
VCC
CANH VSPLIT CANL
Thermal shutdown
VCC
V SPLIT
5
STB
8
Mode & wake-up control
Driver control
6
RxD GND
4
Wake -up Filter
COMP
2
COMP
PC20071005.2
Figure 1. Block Diagram
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AMIS-42675
Table 2. PIN DESCRIPTION
Pin 1 2 3 4 5 6 7 8 Name TxD GND VCC RxD VSPLIT CANL CANH STB Description Transmit Data Input; Low Input Dominant Driver; Internal Pullup Current Ground Supply Voltage Receive Data Output; Dominant Transmitter Low Output Common-Mode Stabilization Output Low-Level CAN Bus Line (Low in Dominant Mode) High-Level CAN Bus Line (High in Dominant Mode) Standby Mode Control Input
Table 3. ABSOLUTE MAXIMUM RATINGS
Symbol VCC VCANH VCANL VSPLIT VTxD VRxD VSTB Vtran(CANH) Vtran(CANL) Vtran(VSPLIT) Vesd( Latch-up Tstg TA TJ Parameter Supply Voltage DC Voltage at Pin CANH DC Voltage at Pin CANL DC Voltage at Pin VSPLIT DC Voltage at Pin TxD DC Voltage at Pin RxD DC Voltage at Pin STB Transient Voltage at Pin CANH Transient Voltage at Pin CANL Transient Voltage at Pin VSPLIT Electrostatic Discharge Voltage at all Pins Static Latch-up at All Pins Storage Temperature Ambient Temperature Maximum Junction Temperature Note 2 Note 2 Note 2 Note 4 Note 5 Note 4 -55 -40 -40 0 < VCC < 5.25 V; No Time Limit 0 < VCC < 5.25 V; No Time Limit 0 < VCC < 5.25 V; No Time Limit Conditions Min -0.3 -50 -50 -50 -0.3 -0.3 -0.3 -300 -300 -300 -5 -750 Max +7 +50 +50 +50 VCC + 0.3 VCC + 0.3 VCC + 0.3 +300 +300 +300 +5 +750 120 +150 +125 +170 Unit V 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 electrostatic discharge (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 Rth(vj-a) Rth(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 145 45 Unit k/W k/W
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AMIS-42675
APPLICATION SCHEMATIC
VBAT
IN
5V- reg
OUT VCC STB
3 8 4 1 2
VCC
7
CANH 60 W 47 nF
CAN controller
PC20071005.3
RxD TxD
AMIS- 42675
5
VSPLIT 60 W
CAN BUS
6
CANL
GND
GND
Figure 2. Application Diagram
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AMIS-42675
FUNCTIONAL DESCRIPTION
Operating Modes
AMIS-42675 provides two modes of operation as illustrated in Table 5. These modes are selectable through Pin STB.
Table 5. OPERATING MODES
Pin RXD Mode Normal Standby Pin STB Low High Low Bus Dominant Wake-up Request Detected High Bus Recessive No wake-up Request Detected
Normal Mode
Overtemperature Detection
In the normal mode, the transceiver 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 lines outputs are optimized to give extremely low EME.
Standby Mode
In stand-by mode both the transmitter and receiver are disabled and a very low-power differential receiver monitors the bus lines for CAN bus activity. The bus lines are terminated to ground and supply current is reduced to a minimum, typically 10 mA. When a wake-up request is detected by the low-power differential receiver, the signal is first filtered and then verified as a valid wake signal after a time period of tBUS, the RxD Pin is driven low by the transceiver to inform the controller of the wake-up request.
Split Circuit
A thermal protection circuit protects the IC from damage by switching off the transmitter if the junction temperature exceeds a value of approximately 160C. 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 needed when a bus line short circuits.
High Communication Speed Range
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
The VSPLIT Pin is operational only in normal mode. In standby mode this pin is floating. The VSPLIT is connected as shown in Figure 2 and its purpose is to provide a stabilized DC voltage of 0.5 x VCC to the bus avoiding possible steps in the common-mode signal therefore reducing EME. These unwanted steps could be caused by an un-powered node on the network with excessive leakage current from the bus that shifts the recessive voltage from its nominal 0.5 x VCC voltage.
Wake-up
A current-limiting circuit protects the transmitter output stage from damage caused by 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). Pins TxD and STB are pulled high internally should the input become disconnected. Pins TxD, STB and RxD will be floating, preventing reverse supply should the VCC supply be removed.
Once a valid wake-up (dominant state longer than tBUS) has been received during the standby mode, the RxD Pin is driven low.
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AMIS-42675
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, TJ = -40C to +150C; RLT = 60 W unless specified otherwise.
Symbol SUPPLY (Pin VCC) ICC ICCS VIH VIL IIH IIL Ci VIH VIL IIH IIL Ci VOH VOL Ioh Iol Vo(reces)(norm) Vo(reces)(stby) Io(reces)(CANH) Io(reces)(CANL) Vo(dom)(CANH) Vo(dom)(CANL) Vo(dif)(bus_dom) Vo(dif)(bus_rec) Io(sc)(CANH) Supply Current Supply Current in Standby Mode Dominant; VTxD = 0 V Recessive; VTxD = VCC Tjunc,max = 100C Output recessive Output Dominant VTxD = VCC VTxD = 0 V Not Tested 2.0 -0.3 -5 -75 - 45 4 10 65 8 15 mA mA V V mA mA pF Parameter Conditions Min Typ Max Unit
TRANSMITTER DATA INPUT (Pin TxD) High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current Input Capacitance - - 0 -200 5 VCC + 0.3 +0.8 +5 -350 10
TRANSMITTER MODE SELECT (Pin STB) High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current Input Capacitance Standby Mode Normal Mode VSTB = VCC VSTB = 0 V Not Tested 2.0 -0.3 -5 -1 - - - 0 -4 5 VCC + 0.3 +0.8 +5 -10 10 V V mA mA pF
RECEIVER DATA OUTPUT (Pin RxD) High-level output voltage Low-level output voltage High-level output current Low-level output current IRXD = -10 mA IRXD = 5 mA Vo = 0.7 x VCC Vo = 0.3 x VCC VTxD = VCC; No Load Normal Mode VTxD = VCC; No Load Standby Mode -35 V < VCANH < +35 V; 0 V < VCC < 5.25 V -35 V < VCANL < +35 V; 0 V < VCC < 5.25 V VTxD = 0 V VTxD = 0 V VTxD = 0 V; Dominant; 42.5 W < RLT < 60 W VTxD = VCC; Recessive; No Load VCANH = 0 V; VTxD = 0 V -5 5 0.6 x VCC 0.25 -10 10 0.75 x VCC 0.45 -15 15 V V mA mA
BUS LINES (Pins CANH and CANL) Recessive Bus Voltage Recessive Bus Voltage 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 (VCANH - VCANL) Differential Bus Output Voltage (VCANH - VCANL) Short Circuit Output Current at Pin CANH 2.0 -100 -2.5 -2.5 3.0 0. 5 1.5 -120 -45 2.5 0 - - 3.6 1.4 2.25 0 -70 3.0 100 +2.5 +2.5 4.25 1.75 3.0 +50 -120 V mV mA mA V V V mV mA
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AMIS-42675
Table 6. DC CHARACTERISTICS VCC = 4.75 V to 5.25 V, TJ = -40C to +150C; RLT = 60 W unless specified otherwise.
Symbol Parameter Conditions Min Typ Max Unit BUS LINES (Pins CANH and CANL) Io(sc)(CANL) Vi(dif) (th) Vihcm(dif)(th) Short Circuit Output Current at Pin CANL Differential Receiver Threshold Voltage (see Figure 4) Differential Receiver Threshold Voltage for High Common-Mode (see Figure 4) Differential Receiver Input Voltage Hysteresis (see Figure 4) Common-Mode Input Resistance at Pin CANH Common-Mode Input Resistance at Pin CANL Matching Between Pin CANH and Pin CANL Common Mode Input Resistance Differential Input Resistance Input Capacitance at Pin CANH Input Capacitance at Pin CANL Differential Input Capacitance VTxD = VCC; Not Tested VTxD = VCC; Not Tested VTxD = VCC; Not Tested Normal Mode; -500 mA < ISPLIT < 500 mA Standby Mode Normal Mode 0.3 x VCC -5 -3 VCANH = VCANL VCANL = 36 V; VTxD = 0 V -5 V < VCANL < +12 V; -5 V < VCANH < +12V; 35 V < VCANL < +35 V; - 35 V < VCANH < +35 V; -35 V < VCANL < +35 V; -35 V < VCANH < +35 V; 45 0.5 0.40 70 0.7 0.7 120 0.9 1.00 mA V V
Vi(dif)(hys) Ri(cm)(CANH) Ri(cm)(CANL) Ri(cm)(m)
50 15 15 -3
70 26 26 0
100 37 37 +3
mV kW kW %
Ri(dif) Ci(CANH) Ci(CANL) Ci(dif) VSPLIT ISPLIT(i) ISPLIT(lim) PORL
25
50 7.5 7.5 3.75
75 20 20 10
kW pF pF pF
COMMON-MODE STABILIZATION (Pin VSPLIT) Reference Output Voltage at Pin VSPLIT VSPLIT Leakage Current VSPLIT Limitation Current POR Level - 0.7 x VCC +5 +3 mA mA
POWER-ON-RESET (POR) CANH, CANL, Vref in Tri-State Below POR Level 2.2 3.5 4.7 V
THERMAL SHUTDOWN TJ(sd) td(TxD-BUSon) td(TxD-BUSoff) td(BUSon-RXD) td(BUSoff-RXD) tpd(rec-dom) td(dom-rec) td(stb-nm) tdbus Shutdown Junction Temperature 150 160 180 C
TIMING CHARACTERISTICS (see Figures 3 and 4) Delay TXD to Bus Active Delay TXD to Bus Inactive Delay Bus Active to RXD Delay Bus Inactive to RXD Propagation Delay TXD to RXD from Recessive to Dominant Propagation delay TXD to RXD from Dominant to Recessive Delay Standby Mode to Normal Mode Dominant Time for Wake-up via Bus Cl = 100 pF between CANH to CANL Cl = 100 pF between CANH to CANL Crxd = 15 pF Crxd = 15 pF Cl = 100 pF between CANH to CANL Cl = 100 pF between CANH to CANL 40 30 25 40 90 90 5 0.75 7.5 2.5 85 60 55 100 105 105 105 105 230 245 10 5 ns ns ns ns ns ns ms ms
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AMIS-42675
MEASUREMENT SETUPS AND DEFINITIONS
+5 V 100 nF
3
VCC
7 1
TxD
CANH 1 nF VSPLIT 1 nF CANL
PC20071006.1
AMIS- 42675
RxD
4 8 2
5
Transient Generator
6
20 pF
STB
GND
Figure 3. Test Circuit for Transients
VRxD High Low
Hysteresis
PC20040829.7
0.5
0.9
Vi(dif)(hys)
Figure 4. Hysteresis of the Receiver
+5 V 100 nF
3
VCC
7 1
TxD
CANH RLT VSPLIT 60 W CLT 100 pF
AMIS- 42675
RxD
4 8 2
5
6
CANL
PC20071006.2
20 pF
STB
GND
Figure 5. Test Circuit for Timing Characteristics
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AMIS-42675
TxD
HIGH LOW
CANH CANL
dominant
Vi(dif) = VCANH - V CANL
0.9V
0.5V recessive
RxD td(TxD-BUSon) tpd(rec-dom)
0.3 x VCC
0.7 x VCC
td(TxD-BUSoff) td(BUSon-RxD) tpd(dom-rec) td(BUSoff-RxD)
PC20040829.6
Figure 6. Timing Diagram for AC Characteristics
+5 V 100 nF
3
VCC
7 1
TxD
CANH
6.2 kW 10 nF Active Probe Spectrum Anayzer
Generator RxD
4
AMIS- 42675
CANL 6 6.2 kW
5
8
2
30 W VSPLIT
30 W 47 nF
PC20071006.3
20 pF
STB
GND
Figure 7. Basic Test Set-up for EME
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AMIS-42675
Figure 8. EME Measurements
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AMIS-42675
DEVICE ORDERING INFORMATION
Part Number AMIS42675ICAH2G AMIS42675ICAH2RG Temperature Range -40C - 125C -40C - 125C Package Type SOIC-8 (Pb-Free) SOIC-8 (Pb-Free) Shipping 96 Tube / Tray 3000 / Tape & Reel
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-42675
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
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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AMIS-42675/D

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