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PDF AMIS-4168X Data sheet ( Hoja de datos )
| Número de pieza | AMIS-4168X | |
| Descripción | Fault Tolerant CAN Transceiver | |
| Fabricantes | AMI SEMICONDUCTOR | |
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AMIS-4168x Fault Tolerant CAN Transceiver
Data Sheet
1.0 General Description
The new AMIS-41682 and AMIS-41683 are interfaces between the protocol controller and the physical wires of the bus lines in a
control area network (CAN). AMIS-41683 is identical to the AMIS-41682 but has a true 3.3V digital interface to the CAN controller.
The device provides differential transmit capability but will switch in error conditions to a single-wire transmitter and/or receiver.
Initially it will be used for low speed applications, up to 125kBaud, in passenger cars.
Both AMIS-41682 and AMIS-41683 are implemented in I2T100 technology enabling both high-voltage analog circuitry and digital
functionality to co-exist on the same chip.
These products consolidate the expertise of AMIS for in-car multiplex transceivers and support together with AMIS-30522 (VAN),
AMIS-30660 and AMIS-30663 (CAN High Speed) and AMIS-30600 (LIN) another widely used physical layer.
2.0 Key Features
• Fully compatible with ISO11898-3 standard
• Optimized for in-car low-speed communication
o Baud rate up to 125kBaud
o Up to 32 nodes can be connected
o 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)
o Fully integrated receiver filters
o Permanent dominant monitoring of transmit data input
o Differential receiver with wide common-mode range for high electromagnetic susceptibility (EMS) in normal- and low-power
modes
o True 3.3V digital I/O interface to CAN controller for AMIS-41683 only
• Management in case of bus failure
o In the event of bus failures, automatic switching to single-wire mode, even when the CANH bus wire is short circuited to
VCC
o The device will automatically reset to differential mode if the bus failure is removed
o During failure modes there is full wake-up capability.
o Un-powered nodes do not disturb bus lines
o Bus errors and thermal shutdown activation is flagged on ERRB pin
• Protection issues
www.DaotaSShhoeertt4cUir.ccuoimt proof to battery and ground
o Thermal protection
o The bus lines are protected against transients in an automotive environment
o An un-powered node does not disturb the bus lines
• Support for low power modes
o Low current sleep and standby mode with wake-up via the bus lines
o Power-on flag on the output
o Two-edge sensitive wake-up input signal via pin WAKEB
• IOs
o The un-powered chip cannot be parasitically supplied either from digital inputs nor from digital outputs.
3.0 Technical Characteristics
Table 1: Technical Characteristics
Symbol
VCANH
Vbat
Parameter
DC voltage at pin CANH, CANL
Voltage at pin Vbat
Conditions
0 < VCC < 5.25V; no time limit
Load-dump
Min Max Unit
-40 +40 V
+40 V
AMI Semiconductor – Rev. 2.0 – Feb. 07
www.amis.com
1
1 page  
AMIS-4168x Fault Tolerant CAN Transceiver
Data Sheet
7.0 Functional Description
7.1. 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 125kBaud, 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-B pins) that allow the user to use external pull-up resistors to the required
supply voltage; this can be 5V or 3.3V.
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 that 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.
7.2. 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 5. 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 3V (VCC = 5V). 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
wwfawi.lDuraetadSihseaeptp4eUa.crosmfor another time delay, the transceiver switches back to 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 via 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 ERRB will become
low. On error recovery, the output signal on pin ERRB 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.
AMI Semiconductor – Rev. 2.0 – Feb. 07
www.amis.com
5
5 Page 
AMIS-4168x Fault Tolerant CAN Transceiver
Data Sheet
Table 9: Characteristics AMIS-4168x continued
Symbol
Parameter
Conditions
Pins CANH and CANL (Receiver)
Vdiff
Differential receiver
threshold voltage
No failures and bus failures 1, 2, 4, and 6a;
see Figure 5
VCC = 5V
VCC = 4.75V to 5.25V
VseCANH
Single-ended receiver
threshold voltage on pin
CANH
Normal operating mode and failures 4, 6 and 7
VCC = 5V
VCC = 4.75 to 5.25V
VseCANL
Single-ended receiver
threshold voltage on pin
CANL
Normal operating mode and failures 3 and 3a
VCC = 5V
VCC = 4.75 to 5.25V
Vdet(CANL)
Detection threshold voltage
for short circuit to battery
voltage on pin CANL
Normal operating mode
Vth(wake)
Wake-up threshold voltage
On pin CANL
On pin CANH
Low power modes
Low power modes
DVth(wake)
Difference of wake-up
Threshold voltages
Low power modes
Pins CANH and CANL (Transmitter)
VO(reces)
Recessive output voltage
On pin CANH
On pin CANL
VO(dom)
Dominant output voltage
On pin CANH
On pin CANL
VTXD = VCC
RRTH < 4kΩ
RRTL < 4kΩ
VTXD = 0V; VEN = VCC
ICANH = -40mA
ICANL = 40mA
IO(CANH)
IO(CANL)
Output current on pin CANH
Output current on pin CANL
Normal operating mode;
VCANH = 0V; VTXD = 0V
Low power modes;
VCANH = 0V; VCC = 5V
Normal operating mode;
VCANL = 14V; VTXD = 0V
Low power modes; VCANL = 12V; VBAT = 12V
Pins RTH and RTL
Rsw(RTL)
Switch-on resistance
between pin RTL and VCC
Normal operating mode; I(RTL)> -10mA
Rsw(RTH)
Switch-on resistance
between pin RTH and
ground
Normal operating mode; I(RTH)< 10mA
VO(RTH)
IO(RTL)
Output voltage on pin RTH Low power modes; IO = 1mA
Output current on pin RTL Low power modes; VRTL = 0V
wwIpwu.(DRaTtaLS) heet4U.cPoumll-up current on pin RTL
Normal operating mode and failures 4, 6 and 7;
VRTL= 0V
Ipd(RTH)
Pull-down current on pin
RTH
Normal operating mode and failures 3 and 3a
Thermal Shutdown
Tj Junction temperature
For shutdown
Min.
-3.25
0.65 x Vcc
1.6
0.32 x Vcc
3
0.61 x Vcc
6.5
2.5
1.1
0.8
Vcc - 0.2
Vcc - 1.4
-110
-1.6
45
-1
-1.25
150
Typ.
Max.
-3 -2.75
0.6 x Vcc 0.55 x Vcc
1.775
1.95
0.355 x Vcc 0.39 x Vcc
3.2 3.4
0.645 x Vcc 0.68 x Vcc
7.3 8
3.2 3. 9
1.8 2.25
1.4
0.2
1.4
-80 -45
0.5 1.6
80 110
0.5 1
100
100
1.0
-0.3
-75
-75
180
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mA
µA
mA
µA
Ω
Ω
V
mA
µA
µA
°C
AMI Semiconductor – Rev. 2.0 – Feb. 07
www.amis.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AMIS-4168X.PDF ] | |
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