0ICAA-001-XTP

AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 1.0 General Description Data Sheet 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 12V and 24V systems. The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. The AMIS-42675 is the low power member of the CAN high-speed transceiver family and offers the following additional features: • • • Ideal passive behaviour when supply voltage is removed Wake-up over bus Extremely low current standby mode Due to the wide common-mode voltage range of the receiver inputs, the AMIS-42675 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-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. 2.0 Key Features • • • • • • • • • • • • • • • 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 12V and 24V 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 (+/- 35V) for high EMS Voltage source via VSPLIT pin for stabilizing the recessive bus level (further EMC improvement) No disturbance of the bus lines with an un-powered node Thermal protection Bus pins protected against transients Power down mode in which the transmitter is disabled Bus and VSPLIT pins short circuit proof to supply voltage and ground Logic level inputs compatible with 3.3V devices At least 110 nodes can be connected to the same bus 3.0 Ordering Information Table 1: Ordering Information Ordering Code (Tubes) 0ICAA-001-XTD Ordering Code (Tape) 0ICAA-001-XTP Marketing Name AMIS 42675AGA Package SOIC-8 GREEN Temp. Range -40°C…125°C AMI Semiconductor –October 07, Rev. 1.0 www.amis.com Specifications subject to change without notice 1 AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 4.0 Technical Characteristics Table 2: Technical Characteristics Symbol Parameter VCC Power supply voltage VSTB DC voltage at pin STB VTxD DC voltage at pin TxD VRxD DC voltage at pin RxD VCANH DC voltage at pin CANH VCANL DC voltage at pin CANL VSPLIT DC voltage at pin VSPLIT VO(dif)(bus_dom) Differential bus output voltage in dominant state CM-range Input common-mode range for comparator VCM-peak Cload tpd(rec-dom) t pd(dom-rec) VCM-step Tjunc Common-mode peak Load capacitance on IC outputs Propagation delay TxD to RxD Propagation delay TxD to RxD Common-mode step Junction temperature Data Sheet Conditions 0 < VCC < 5.25V; no time limit 0 < VCC < 5.25V; no time limit 0 < VCC < 5.25V; no time limit 42.5Ω < RLT < 60Ω Guaranteed differential receiver threshold and leakage current Note See Figure 5 See Figure 5 Note Min. 4.75 -0.3 -0.3 -0.3 -35 -35 -35 1.5 -35 -500 70 100 -150 -40 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 Note: The parameters VCM-peak and VCM-step guarantee low EME. 5.0 Block Diagram VCC 3 VCC AMIS- 42675 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 AMI Semiconductor –October 07, Rev. 1.0 www.amis.com Specifications subject to change without notice 2 AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 6.0 Typical Application 6.1 Application Schematic Data Sheet VBAT IN 5V-reg OUT VCC STB 3 8 4 VCC 7 CANH 60 Ω CAN controller RxD TxD AMIS42675 2 5 VSPLIT 60 Ω 47 nF CAN BUS 1 6 CANL PC20071005 .3 GND GND Figure 2: Application Diagram 6.2 Pin Description TxD GND VCC RxD 1 8 STB CANH CANL VSPLIT AMIS42675 Figure 3: Pin Configuration 2 3 4 7 6 5 PC20071005 .1 Table 3: Pin Out Pin Name 1 TxD 2 GND 3 VCC 4 RxD 5 VSPLIT 6 CANL 7 CANH 8 STB Description Transmit data input; low input => dominant driver; internal pull-up 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) Stand-by mode control input AMI Semiconductor –October 07, Rev. 1.0 3 www.amis.com Specifications subject to change without notice AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 7.0 Functional Description 7.1 Operating Modes AMIS-42675 provides two modes of operation as illustrated in Table 4. These modes are selectable through pin STB. Table 4: Operating Modes Mode Pin STB Pin RXD Low High Bus recessive No wake-up request detected Data Sheet Normal Standby Low High Bus dominant Wake-up request detected 7.1.1. Normal Mode 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. 7.1.2. Stand-by 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 10µA. 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. 7.2 Split Circuit 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. 7.3 Wake-up Once a valid wake-up (dominant state longer than tBUS) has been received during the standby mode the RxD pin is driven low. 7.4 Over-temperature Detection 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 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. 7.5 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 1Mbit/s. 7.6 Fail Safe Features 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 4). 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. AMI Semiconductor –October 07, Rev. 1.0 4 www.amis.com Specifications subject to change without notice AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 8.0 Electrical Characteristics 8.1 Definitions Data Sheet 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. 8.2 Absolute Maximum Ratings Stresses above those listed in the following table may cause permanent device failure. Exposure to absolute maximum ratings for extended periods may affect device reliability. Table 5: Absolute Maximum Ratings Symbol Parameter Supply voltage VCC DC voltage at pin CANH VCANH DC voltage at pin CANL VCANL DC voltage at pin VSPLIT VSPLIT DC voltage at pin TxD VTxD DC voltage at pin RxD VRxD DC voltage at pin STB VSTB Transient voltage at pin CANH Vtran(CANH) Transient voltage at pin CANL Vtran(CANL) Transient voltage at pin VSPLIT Vtran(VSPLIT) Conditions Min. -0.3 -50 -50 -50 -0.3 -0.3 -0.3 -300 -300 -300 Max. +7 +50 +50 +50 VCC + 0.3 VCC + 0.3 VCC + 0.3 +300 +300 +300 Unit V V V V V V V V V V 0 < VCC < 5.25V; no time limit 0 < VCC < 5.25V; no time limit 0 < VCC < 5.25V; no time limit Note 1 Note 1 Note 1 Note 2 Note 4 Note 3 Vesd( Latch-up Electrostatic discharge voltage at all pins Static latch-up at all pins Storage temperature Ambient temperature Maximum junction temperature -5 -750 -55 -40 -40 Tstg Tamb Tjunc +5 +750 120 +150 +125 +170 kV V mA °C °C °C Notes: 1) Applied transient waveforms in accordance with ISO 7637 part 3, test pulses 1, 2, 3a, and 3b (see Figure 4). 2) Standardized human body model electrostatic discharge (ESD) pulses in accordance to MIL883 method 3015.7. 3) Static latch-up immunity: Static latch-up protection level when tested according to EIA/JESD78. 4) Standardized charged device model ESD pulses when tested according to EOS/ESD DS5.3-1993. 8.3 Thermal Characteristics Table 6: Thermal Characteristics Symbol Parameter Thermal resistance from junction to ambient in SO8 package Rth(vj-a) Thermal resistance from junction to substrate of bare die Rth(vj-s) Conditions In free air In free air Value 145 45 Unit K/W K/W AMI Semiconductor –October 07, Rev. 1.0 5 www.amis.com Specifications subject to change without notice AMIS-42675 High-Speed Low Power CAN Transceiver For Long Networks 8.4 Characteristics VCC = 4.75 to 5.25V; Tjunc = -40 to +150°C; RLT =60Ω unless specified otherwise. Table 7: Characteristics Symbol Parameter Supply (pin VCC) Supply current ICC Supply current in standby mode Transmitter Data Input (pin TxD) High-level input voltage VIH Low-level input voltage VIL High-level input current IIH Low-level input current IIL Input capacitance Ci Transmitter Mode Select (pin STB) High-level input voltage VIH Low-level input voltage VIL High-level input current IIH Low-level input current IIL Input capacitance Ci Receiver Data Output (pin RxD) High-level output voltage VOH Low-level output voltage VOL High-level output current Ioh Low-level output current Iol Bus Lines (pins CANH and CANL) Recessive bus voltage Vo(reces) (norm) Conditions Min. Typ. Max. Data Sheet Unit ICCS Dominant; VTxD = 0V Recessive; VTxD = VCC Tjunc,max = 100°C Output recessive Output dominant 2.0 -0.3 -5 -75 2.0 -0.3 -5 -1 0.6 x VCC -5 5 2.0 -100 -2.5 -2.5 3.0 0. 5 1.5 -120 -45 45 0.5 0.40 50 15 15 -3 25 45 4 10 0 -200 5 0 -4 5 65 8 15 VCC + 0.3 +0.8 +5 -350 10 VCC + 0.3 +0.8 +5 -10 10 0.75 x VCC 0.45 -15 15 3.0 100 +2.5 +2.5 4.25 1.75 3.0 +50 -120 120 0.9 1.00 100 37 37 +3 75 20 20 10 mA mA µA V V µA µA pF V V µA µA pF V V mA mA V mV mA mA V V V mV mA mA V V mV KΩ KΩ % KΩ pF pF pF VTxD =VCC VTxD = 0V Not tested Standby mode Normal mode VSTB =VCC VSTB = 0V Not tested IRXD = -10mA IRXD = 5mA Vo = 0.7 x VCC Vo = 0.3 x VCC VTxD = VCC; no load normal mode VTxD = VCC; no load standby mode -35V