AMIS-41682 ONSEMI | Alldatasheet
Document overview
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Technical content
Features
- Fully Compatible with ISO11898−3 Standard
- Optimized for In−Car Low−speed Communication ♦ Baud Rate up to 125 kB ♦ Up to 32 Nodes can be Connected ♦ Due to Built−in Slope Control function and a very Good Matching of the CANL and CANH bus outputs, this device realizes a very low electromagnetic emission (EME) ♦ Fully Integrated Receiver Filters ♦ Permanent Dominant Monitoring of Transmit Data Input ♦ Differential Receiver with Wide Common−Mode Range for High Electromagnetic Susceptibility (EMS) in Normal− and Low−Power Modes ♦ True 3.3 V Digital I/O Interface to CAN Controller for AMIS−41683 Only
- Management in Case of Bus Failure ♦ In the Event of Bus Failures, Automatic Switching to Single−Wire Mode, even when the CANH Bus Wire is Short−Circuited to VCC ♦ The Device will Automatically Reset to Differential Mode if the Bus Failure is Removed ♦ During Failure Modes There is Full Wake−up Capability ♦ Unpowered Nodes do not Disturb Bus Lines ♦ Bus Errors and Thermal Shutdown Activation is Flagged on ERR Pin
- Protection Issues ♦ Short Circuit Proof to Battery and Ground ♦ Thermal Protection ♦ The Bus Lines are Protected Against Transients in an Automotive Environment ♦ An Unpowered Node Does not Disturb the Bus Lines
- Support for Low Power Modes ♦ Low Current Sleep and Standby Mode with Wake−up via the Bus Lines ♦ Power−on Flag on the Output ♦ Two−Edge Sensitive Wake−up Input Signal via Pin WAKE
- I/Os ♦ The unpowered chip cannot be parasitically supplied either from digital inputs or from digital outputs
- 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. http://onsemi.com PIN ASSIGNMENT (Top View) See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet.
ORDERING INFORMATION
AMIS−4168x PC20041029.1 ERR STB WAKE
Table 1. TECHNICAL CHARACTERISTICS Figure 1. Block Diagram (*) For AMIS-41682 pull up to VCC.
4 Failure
Table 2. PIN DESCRIPTION
1 INH Inhibit Output for External Voltage Regulator
2 TxD Transmit Data Input; Internal Pullup Current
3 RxD Receive Data Output
4 ERR Error; Wake−up and Power−on Flag; Active Low
5 STB Standby Digital Control Input; Active Low; Pulldown Resistor
6 EN Standby Digital Control Input; Active High; Pulldown Resistor
7 WAKE Enable Digital Control Input; Falling and Rising Edges are Both Detected
8 RTH Pin for External Termination Resistor at CANH
9 RTL Pin for External Termination Resistor at CANL
10 VCC 5 V Supply Input
11 CANH Bus Line; High in Dominant State
12 CANL Bus Line; Low in Dominant State
13 GND Ground
14 VBAT Battery Supply
Table 3. ABSOLUTE MAXIMUM RATINGS
- The applied transients shall be in accordance with ISO 7637 part 1, test pulses 1, 2, 3a, and 3b. Class C operation
- Human Body Model according Mil −Std−883C−Meth−3015.7
- Charged Device Model according ESD −STM5.3.1−1999
Table 4. THERMAL CHARACTERISTICS
AMIS−41682, AMIS−41683 http://onsemi.com FUNCTIONAL DESCRIPTION
Description
AMIS−41682 is a fault tolerant CAN transceiver which works as an interface between the CAN protocol controller and the physical wires of the CAN bus (see Figure 2). It is primarily intended for low speed applications, up to 125 kB, in passenger cars. The device provides differential transmit capability to the CAN bus and differential receive capability to the CAN controller. The AMIS −41683 has open −drain outputs (RXD and ERR Pins), which allow the user to use external pullup resistors to the required supply voltage; this can be 5 V or 3.3 V . To reduce EME, the rise and fall slope are limited. Together with matched CANL and CANH output stages, this allows the use of an unshielded twisted pair or a parallel pair of wires for the bus lines. The failure detection logic automatically selects a suitable transmission mode, differential or single−wire transmission. Together with the transmission mode, the failure detector will configure the output stages in such a way that excessive currents are avoided and the circuit returns to normal operation when the error is removed. A high common−mode range for the differential receiver guarantees reception under worst case conditions and together with the integrated filter the circuit realizes an excellent immunity against EMS. The receivers connected to pins CANH and CANL have threshold voltages that ensure a maximum noise margin in single−wire mode. A timer has been integrated at Pin TXD. This timer prevents the AMIS−41682 from driving the bus lines to a permanent dominant state. Failure Detector The failure detector is fully active in the normal operating mode. After the detection of a single bus failure the detector switches to the appropriate mode. The different wiring failures are depicted in Figure 4. The figure also indicates the effect of the different wiring failures on the transmitter and the receiver. The detection circuit itself is not depicted. The differential receiver threshold voltage is typically set at 3 V (V CC = 5 V). This ensures correct reception with a noise margin as high as possible in the normal operating mode and in the event of failures 1, 2, 4, and 6a. These failures, or recovery from them, do not destroy ongoing transmissions. During the failure, reception is still done by the differential receiver and the transmitter stays fully active. To avoid false triggering by external RF influences the single−wire modes are activated after a certain delay time. When the bus failure disappears for another time delay, the transceiver switches back to the differential mode. When one of the bus failures 3, 5, 6, 6a, and 7 is detected, the defective bus wire is disabled by switching off the affected bus termination and the respective output stage. A wake−up from sleep mode via the bus is possible either by way of a dominant CANH or CANL line. This ensures that a wake−up is possible even if one of the failures 1 to 7 occurs. If any of the wiring failure occurs, the output signal on pin ERR will become low. On error recovery, the output signal on pin ERR will become high again. During all single −wire transmissions, the EMC performance (both immunity and emission) is worse than in the differential mode. The integrated receiver filters suppress any HF noise induced into the bus wires. The cut−off frequency of these filters is a compromise between propagation delay and HF suppression. In the single −wire mode, LF noise cannot be distinguished from the required signal.
- Local Wake−up: Rising or falling edge on input WAKE (levels maintained for a certain period).
- Remote Wake−up from CAN Bus: A message with five consecutive dominant bits. On a wake−up request the transceiver will set the output on Pin INH high which can be used to activate the external supply voltage regulator. Note: Pin INH is also set similarly as an after wake up event by V BAT voltage being below the battery power on flag level. (See FLAG_VBAT in Figure 5) If VCC is provided, the wake−up request can be read on the ERR or RXD outputs so the external microcontroller can wake−up the transceiver (switch to normal operating mode) via Pins STB and EN. In the low power modes the failure detection circuit remains partly active to prevent increased power consumption in the event of failures 3, 3a, 4, and 7. The go−to−sleep−mode is only a transition mode. The Pin INH stays active for a limited time. During this time the circuit can still go to another low −power mode. After this time the circuit goes to the sleep−mode. In case of a wake up request (from BUS or WAKE Pin) during this transition time, the wake −up request has higher priority than go−to−sleep and INH will not be deactivated. Behavior in Case of Missing Supplies If VCC is below the threshold level FLAG_VCC, the signals on pins STB and EN will internally be set to low-level to provide fail safe functionality. In this way, a low-power mode will be forced in case of missing/failing V CC supply. Similarly, missing/failing VBAT supply – i.e. V BAT being below FLAG_VBAT level - will lead to a fail-safe behavior of the transceiver by forcing a low-power mode. A forced low-power in case of missing supplies guarantees that the transceiver will in no way disturb the other CAN nodes when the local electronic unit looses ground or battery connection. STB change state Power−On Stand−by High Low Act EN change state STB change state 1) Only when Vcc > POR_Vcc 2) INH active for a time = T_GoToSleep 3) Local Wake−up through pin Wake which change state for a time > T_wake_min Remote Wake−up through pin CANL or CANH when dominant for a time >TCANH_min or TCANL_min 4) Mode Change through pins STB and EN is only possible if Vcc > POR_Vcc STB ERR RxDINHEN RTL POR− flag WU− int Vbat Normal Mode High High Act STB ERR RxDINHEN RTL Err− flag Rec. out Vcc Standby Mode Low Low Act STB ERR RxDINHEN RTL Vbat GoTo Sleep Mode Low High Act STB ERR RxDINHEN RTL Vbat Sleep Mode Low Low Hz STB ERR RxDINHEN RTL VbatWU− int WU− int WU− int WU− int WU− int 1) WU− int 1) EN change state EN, STB change state EN, STB change state Time−out GoToSleep mode Local or Remote Wake−up 3) Power−On Mode Change 4)
Figure 5. Low Power Modes will become high and an internal power−on flag will be set. temperature. All other parts of the IC will remain operating.
AMIS−41682, AMIS−41683 http://onsemi.com
ELECTRICAL CHARACTERISTICS
All voltages are referenced to GND (Pin 13). Positive currents flow into the IC. Sinking current means that the current is flowing into the pin. Sourcing current means that the current is flowing out of the pin. Table 5. CHARACTERISTICS AMIS−4168x VCC = 4.75 V to 5.25 V, VBAT = 5 V to 36 V, TJ = −40°C to +150°C; unless otherwise
500 V between RTL − CANL
500 V between RTH − CANH
Table 6. CHARACTERISTICS AMIS−41682 (5 V Version) VCC = 4.75 V to 5.25 V, VBAT = 5 V to 36 V, TJ = −40°C to +150°C; Table 7. CHARACTERISTICS AMIS−41683 (3.3 Version) VCC = 4.75 V to 5.25 V, VBAT = 5 V to 36 V, TJ = −40°C to +150°C; Table 8. CHARACTERISTICS AMIS−4168x VCC = 4.75 V to 5.25 V, VBAT = 5 V to 36 V, TJ = −40°C to +150°C; unless otherwise
Table 9. TIMING CHARACTERISTICS AMIS−4168x VCC = 4.75 V to 5.25 V, VBAT = 5 V to 27 V, VSTB = VCC, TJ = −40°C to +150°C; unless otherwise specified.
Figure 10. Test Circuit for Schaffner Tests (ISO 7637 part)
55 Tube / Tray
Specifications Brochure, BRD8011/D.
AMIS−41682, AMIS−41683 http://onsemi.com PACKAGE DIMENSIONS SOIC 14 CASE 751AP−01 ISSUE A
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