AMIS42665AGA

AMIS-42665 High-Speed Low Power CAN Transceiver Data Sheet 1.0 General Description The AMIS-42665 CAN transceiver is the interface between a controller area network (CAN) protocol controller and the physical bus and 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-42665 is a new addition to 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-42665 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. 2.0 Key Features • • • • • • • • • • • • • • • Compatible with the ISO 11898 standard (ISO 11898-2, ISO 11898-5 and SAE J2284) High speed (up to 1Mbaud) Ideally suited for 12V and 24V industrial and automotive applications Extremely low current standby mode with wake-up via the bus Low 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 Transmit data (TxD) dominant time-out function Thermal protection Bus pins protected against transients in an automotive environment 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 Marketing Name AMIS42665AGA AMIS42665ALA Package SOIC 150 8 GREEN (JEDEC MS-012) SOIC 150 8 GREEN (NiPdAu, JEDEC MS-012) Temp. Range -40°C…125°C -40°C…125°C AMI Semiconductor – Rev. 3.1, April 06 www.amis.com 1 AMIS-42665 High-Speed Low Power CAN Transceiver Data Sheet 4.0 Technical Characteristics Table 1: 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) Symbol t pd(dom-rec) VCM-step Tjunc Common-mode peak Load capacitance on IC outputs Propagation delay TxD to RxD Parameter Propagation delay TxD to RxD Common-mode step Junction temperature 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 See Figure 8 and 9 (Note) See Figure 5 Conditions See Figure 5 See Figure 8 and 9 (Note) Min. 4.75 -0.3 -0.3 -0.3 -35 -35 -35 1.5 -35 -500 70 Min. 100 -150 -40 Max. 5.25 VCC VCC VCC +35 +35 +35 3 +35 500 15 230 Max. 245 150 150 Unit V V V V V V V V V mV pF ns Unit ns mV °C Note: The parameters VCM-peak and VCM-step guarantee low EME. 5.0 Block Diagram VCC 3 VCC AMIS-42665 POR 7 TxD 1 Timer VCC CANH VSPLIT CANL Thermal shutdown VCC VSPLIT Mode & wake-up control 5 STB 8 Driver control 6 RxD GND 4 Wake-up Filter COMP 2 COMP PC20050211.1 Figure 1: Block Diagram AMI Semiconductor – Rev. 3.1, April 06 www.amis.com 2 AMIS-42665 High-Speed Low Power CAN Transceiver 6.0 Typical Application 6.1 Application Schematic Data Sheet VBAT IN 5V-reg OUT VCC STB 8 3 7 VCC RLT = 60 Ω CANH CAN controller RxD 4 AMIS42665 5 VSPLIT CLT = 47 nF CAN BUS TxD 1 2 6 CANL RLT = 60 Ω GND PC20040829.3 GND Figure 2: Application Diagram 6.2 Pin Description TxD GND VCC RxD 1 8 STB CANH CANL VSPLIT AMIS42665 2 3 4 7 6 5 PC20040829.1 Figure 3: Pin Configuration Table 2: Pinout Pin Name Description 1 TxD Transmit data input; low input => dominant driver; internal pull-up current 2 GND Ground 3 VCC Supply voltage 4 RxD Receive data output; dominant transmitter => low output 5 VSPLIT Common-mode stabilization output 6 CANL Low-level CAN bus line (low in dominant mode) 7 CANH High-level CAN bus line (high in dominant mode) 8 STB Standby mode control input AMI Semiconductor – Rev. 3.1, April 06 3 www.amis.com AMIS-42665 High-Speed Low Power CAN Transceiver 7.0 Functional Description 7.1 Operating Modes Data Sheet AMIS-42665 provides two modes of operation as illustrated in Table 3. These modes are selectable through pin STB. Table 3: Operating Modes Pin Pin RXD Mode STB Low High Normal Low Bus dominant Bus recessive Standby High Wake-up request detected No 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. Standby Mode In standby 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 TxD Dominant Time-out Function A TxD dominant time-out timer circuit prevents the bus lines being driven to a permanent dominant state (blocking all network communication) if pin TxD is forced permanently low by a hardware and/or software application failure. The timer is triggered by a negative edge on pin TxD. If the duration of the low-level on pin TxD exceeds the internal timer value tdom, the transmitter is disabled, driving the bus into a recessive state. The timer is reset by a positive edge on pin TxD. This TxD dominant time-out time (tdom)defines the minimum possible bit rate to 40kBaud. 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. AMI Semiconductor – Rev. 3.1, April 06 4 www.amis.com AMIS-42665 High-Speed Low Power CAN Transceiver Data Sheet 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. 8.0 Electrical Characteristics 8.1 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. 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 effect device reliability. Table 4: 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 2 Note 4 Note 3 Vesd(CANL/CANH/ VSPLIT) Electrostatic discharge voltage at CANH and CANL pin Electrostatic discharge voltage at all other pins Static latch-up at all pins Storage temperature Ambient temperature Maximum junction temperature -8 -500 -5 -500 -55 -40 -40 +8 +500 +5 +500 120 +150 +125 +170 kV V kV V mA °C °C °C Vesd Latch-up Tstg Tamb Tjunc 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 5: 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 – Rev. 3.1, April 06 5 www.amis.com AMIS-42665 High-Speed Low Power CAN Transceiver Data Sheet 8.4 Characteristics VCC = 4.75 to 5.25V; Tjunc = -40 to +150°C; RLT =60Ω unless specified otherwise. Table 6: 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. 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