MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) TX 1 Standby input STB 2 Error I/O ERR 3 Data input Data output RX 4 M54617P The M54617P is an integrated circuit for two-wire system LAN transceivers in compliance with J1850. It has a built-in function detecting bus-line abnormality, and allows ERR signal to turn to “L” in case of abnormality. In addition, the selector permits the output of normal bus signal. Turning the standby signal to “L” provides a low current dissipation status, when both BUS(+) and BUS(-) of the driver are turned OFF. Further, inputting “H” level to ERR pin when in the standby mode allows error output to be reset. Power supply 8 VDD 7 BUS(+) 6 BUS(-) 5 VSS Bus-line I/O GND Outline 8P4 FEATURES ● Compliance with SAE J1850 standards ● Built-in function detecting bus-line abnormality APPLICATION LAN transceivers in general and other communication transceivers (The M59330P having the same function is available as a vehicleloaded LAN transceiver). BLOCK DIAGRAM Data input TX Output control circuit 1 Overcurrent detection circuit 8 VDD Driver 7 BUS (+) Power supply Bus-line I/O Driver Standby input STB 2 Standby control circuit Error I/O ERR 3 Abnormality detection circuit Data output RX 4 Selector 6 BUS (-) 5 VSS BUS (+) signal detection circuit Filter BUS (-) signal detection circuit GND MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER FUNCTION Pin function Pin No. Pin name I/O Function 1 TX Input Data signal input pin 2 STB Input Standby signal input pin L: standby mode, H: normal operation 3 ERR I/O 4 RX Output 5 VSS Input 6 BUS(-) I/O Signal output pin to transmission route and signal input pin from transmission route (negative logic) 7 BUS(+) I/O Signal output pin to transmission route and signal input pin from transmission route (positive logic) 8 VDD Input Error signal output pin and error reset input pin “L” level output when abnormal transmission route is detected Error reset with “H” level input when in the standby mode Signal output pin from transmission route Grounding pin Power supply pin ABNORMALITY DETECTION OF TRANSMISSION ROUTE AND COMMUNICATION FUNCTION The M54617P uses its driver overcurrent detection function and transmission signal logic abnormality function to perform the abnormality detection of the transmission route, and outputs error signal (ERR(3 pin) = “L”). In addition, switching the signal that is output to Rx pin (pin 4) according to the abnormality occurrence status permits communication after abnormality has occurred. (1) Overcurrent detection BUS(+) pin (pin 7) and BUS(-) pin (pin 6) drivers of M54617P are equipped with an overcurrent detection circuit. When overcurrent flows to a driver, the driver is turned OFF to output error signal (ERR (pin 3) = “L”). Once an overcurrent is detected, the driver maintains the OFF status until the error is reset. In addition, each driver of BUS(+) pin (pin 7) and BUS(-) pin (pin 6) is independent, and both may be turned OFF depending upon the abnormality occurrence status. A built-in filter for the prevention of malfunction due to overcurrent when the driver is turned ON does not permit the detection of the overcurrent status for a short time (several hundred ns). Detection current is set to about 180mA. (2) Logic abnormality detection The M54617P transmission signals operate in the opposite phase to each other, and abnormal transmission route is detected by comparing these signals. Upon comparing respective signals after a set time on the basis of the edge of transmission routes BUS(+) and BUS(-), any disagreement is regarded as abnormal transmission, and error signal (ERR (pin 3) = “L”) is output. In order to be well timed with that edge as a new standard, abnormality is detected when signal disagreement continues for more than a set time. Setting time is set to about 4.2µs. Logic abnormality detection does not cope with more than one error mode. Detection of logic abnormality alone does not allow the driver to be turned OFF. Abnormality detection allows the driver to be turned OFF only when overcurrent is detected. (3) Communication function The M54617P ordinarily outputs the differential signals of BUS(+) (pin 7) and BUS(-) (pin 6). When abnormality is detected, signals to be output to Rx pin (pin 4) are switched according to the status. When overcurrent is detected, the driver or the transmission route in which overcurrent is detected is considered abnormal, and error signal is output, and concurrently the signal of another transmission route is output to Rx output (pin 4). As described in the above section (1), both drivers are turned OFF in some cases. In these cases, Rx output (pin 4) is fixed to “L”. When logic abnormality is detected, error signal (ERR (pin 3) = “L”) is output, and concurrently Rx output (pin 4) is turned to “L”. After error signal is output, the transmission route in which the edge of transmission signals is detected is considered normal, and such signal is output to Rx output (pin 4). In switching operation of error signal output and Rx output the priority is given to overcurrent detection over logic abnormality detection. MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER Table 1. Abnormality mode and abnormality detection function Abnormality mode 1 2 3 4 5 6 7 GND short VDD short Open GND short VDD short BUS(-) Open BUS(+) and BUS(-) short BUS(+) Error output Communication after abnormality is detected Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Abnormality detection method (2) (1), (2) (2) (1), (2) (2) (2) (1) ERROR RESET STANDBY MODE Error output of the M54617P can be reset by turning to the standby mode (STB pin (pin 2) = “L”), followed by inputting “H” level to ERR pin (pin 3). In this case, all operations are cleared that relate to abnormality detection including overcurrent detection and switching of Rx output. The M54617P can be set to the low current dissipation mode by turning STB pin (pin 2) to level “L”. Standby mode does not allow the driver and overcurrent detection function to be operated, but logic abnormality detection function operates, which permits detection other than abnormality relating to overcurrent detection. However, it provides error signal output only, but no switching of Rx output signal. Rx output when in the standby mode outputs the logic sum of BUS(+) and BUS(-) signals. I/O EQUIVALENT CIRCUIT 1 Tx and STB input 2 ERR I/O 3 Rx output 4 BUS(+) and BUS(-) I/O BUS (+) BUS (-) Filter time constant RC = 110E-9 (standard) MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER ABSOLUTE MAXIMUM RATINGS (Ta = 25°C unless otherwise noted) Symbol Parameter VDD VI VO Supply voltage Input voltage Output voltage IO Driver output current Pmax Tstg Allowable power dissipation Storage temperature Conditions BUS(+) BUS(-) Min. -0.3 -0.3 -0.3 Ratings Typ. Max. 6.5 VDD+0.3 VDD+0.3 50 -50 200 125 -50 Unit V V V mA mW °C Note: All voltages shall be based on V SS pin of the circuit, the max. and min. values be indicated in the absolute values, and the directions of the current be positive when flowing into the circuit and negative (“-” symbol) when flowing out of the circuit. RECOMMENDED OPERATING CONDITIONS (Ta = 25°C unless otherwise noted) Parameter Symbol VDD Supply voltage RBUS BUS resistance CBUS BUS capacitance Topr Conditions Operating temperature Transmission rate = 41.6Kbps Transmission rate = 125Kbps Transmission rate = 41.6Kbps, RBUS = 378Ω Min. 4.75 105 105 Limits Typ. Max. 5.25 Unit V Ω 10000 pF Transmission rate = 125Kbps, RBUS = 378Ω 3000 -20 75 °C MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER ELECTRICAL CHARACTERISTICS (Ta = 25°C and VDD = 5.0V when in normal operation unless otherwise noted) Symbol Parameter Conditions Min. Limits Typ. Max. Unit IDD1 Supply current 1 RBUS = 105Ω, TX = “L”, STB = “H” 5.0 mA IDD2 Supply current 2 RBUS = 105Ω, TX = “H”, STB = “H” 55 mA IDD3 Supply current 3 200 µA VTH1 VTH2 VTL VHYSL VCIN VHYSB “H” input threshold voltage 1 “H” input threshold voltage 2 “L” input threshold voltage Hysterisis width BUS input voltage range Input hysterisis width 3.2 3.5 2.8 1.0 VDD-2.0 300 V V V V V mV IIPP1 BUS(+) leakage current 1 100 µA IIDP1 BUS(+) leakage current 2 When the power supply is turned OFF (VDD = 0V), BUS(+) = 5V 100 µA IIPP2 BUS(+) leakage current 3 When the power supply is turned ON BUS(+) = 0V IIDP2 BUS(+) leakage current 4 When the power supply is turned ON BUS(+) = 5V 100 µA IIPM1 BUS(-) leakage current 1 When the power supply is turned OFF (VDD = 0V), BUS(-) = 5V 100 µA IIDM1 BUS(-) leakage current 2 When the power supply is turned OFF (VDD = 0V), BUS(-) = 0V 100 µA IIPM2 BUS(-) leakage current 3 When the power supply is turned ON BUS(-) = 5V 20 µA IIDM2 BUS(-) leakage current 4 100 µA VDROP1 VDROP2 VOH1 VOL1 VOH2 IPD Driver and drop voltage “H” output voltage 1 “L” output voltage 1 “H” output voltage 2 ERR pulldown current CI1 Input capacitance 1 CI2 VTH1 Input capacitance 2 Grounding offset voltage RBUS = 105Ω, TX = STB = “H” ERR TX, STB TX, STB TX, STB BUS(+), BUS(-) BUS(+) and BUS(-) differential input When the power supply is turned OFF (VDD = 0V), BUS(+) = 0V When the power supply is turned ON BUS(-) = 0V IBUS(+) = -50mA IBUS(-) = +50mA RX pin IOH = -1mA RX pin IOL = +1mA ERR pin IOH = -1mA ERR pin VOH = 3.0V When the power supply is turned OFF (VDD = 0V) When the power supply is turned ON Between 2 nodes 2.2 2.3 1.6 0.4 VSS 70 µA -20 4.5 4.5 350 1.5 0.6 5.0 0.6 5.0 700 V V V µA 150 pF 150 0.5 pF V V MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER TIMING CHARACTERISTICS (Ta = 25°C and VDD = 5.0V when in normal operation unless otherwise noted) Symbol Parameter Conditions Min. Limits Typ. Max. Unit TdTBr TX → BUS output delay time CBUS = 10000pF, RBUS = 378Ω Transmission rate = 41.6Kbps 0.25 µs TdTRr TX → RX rise delay time CBUS = 10000pF, RBUS = 378Ω Transmission rate = 41.6Kbps 0.6 µs TdTRf TX → RX fall delay time CBUS = 10000pF, RBUS = 378Ω Transmission rate = 41.6Kbps 3.0 µs TdBRr BUS → RX rise delay time Transmission rate = 41.6Kbps 0.35 µs TdBRf BUS → RX fall delay time Transmission rate = 41.6Kbps 0.33 µs TWS TSS ThS TWE STB input minimum pulse width STB input setup time STB input holding time ERR input pulse width Standby mode At error reset At error reset At error reset 3.0 1.0 100 200 µs µs ns ns MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER TIMING DIAGRAM Timing waveform TX BUS (-) BUS (+) TdTBr TdBRf TdBRr RX TdTRf TdTRr Error reset timing ERR (output) TdE* STB TsS TwS ThS ERR (reset input) High impedance TwE TdE*= about 20ns (reference value) MITSUBISHI <CONTROL / DRIVER IC> M54617P LAN TRANSCEIVER APPLICATION EXAMPLE (This is only an example, so it allows more examination if necessary) Transmission route connection example RL RL Transmission route (twist pair cable) RL RL BUS(+) BUS(-) M54617P BUS(+) BUS(-) M54617P Peripheral controller (M64100TFP) and microcomputer circuits Peripheral controller (M64100TFP) and microcomputer circuits Board 1 Board n Peripheral circuit example 0.1µF VDD 10µF 1 8 RL 2 10k 3 M54617P Controller (M64100TFP) 10k 7 6 RL Microcomputer 4 5 BUS(-) BUS (+) VZ = 7V Zenor • Use of Zenor diode in the range of Vz = 7V is recommended for surge protection. • Installation of external capacitance is recommended between the power supply pin and GND in order to prevent malfunction due to noise, etc. • In the example given, terminal resistor is connected to the edge of transmission route in the transmission route connection, but the method of connecting terminal resistor to each node is recommended. In this case, pay attention to the total terminal resistance value of the transmission route.