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MITSUBISHI
M54617P
LAN TRANSCEIVER
DESCRIPTION
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.
PIN CONFIGURATION (TOP VIEW)
Data input
TX
1
8
VDD BUS(+) BUS(-) VSS
Power supply Bus-line I/O GND
M54617P
Standby input STB Error I/O ERR Data output RX
2 3 4
7 6 5
Outline 8P4
FEATURES
q Compliance with SAE J1850 standards q 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
Overcurrent detection circuit
8
VDD
Power supply
Data input
TX
1
Output control circuit
Driver
7
BUS (+) Bus-line I/O
Driver Standby input STB 2 Standby control circuit
6
BUS (-)
Error I/O ERR
3
Abnormality detection circuit
BUS (+) signal detection circuit
Data output RX
4
Selector
Filter
5 BUS (-) signal detection circuit
VSS
GND
MITSUBISHI
M54617P
LAN TRANSCEIVER
FUNCTION Pin function
Pin No.
1
Pin name TX STB
I/O Input Input Data signal input pin Standby signal input pin L: standby mode, H: normal operation
Function
2
3
ERR
I/O
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 Signal output pin to transmission route and signal input pin from transmission route (negative logic) Signal output pin to transmission route and signal input pin from transmission route (positive logic) Power supply pin
4
RX VSS BUS(-) BUS(+) VDD
Output Input I/O I/O Input
5
6
7
8
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 4.2s. 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
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 Yes Yes Yes Yes Yes Yes Yes Communication after abnormality is detected Yes Yes Yes Yes Yes Yes No Abnormality detection method (2) (1), (2) (2) (1), (2) (2) (2) (1)
ERROR RESET
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.
STANDBY MODE
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
M54617P
LAN TRANSCEIVER
ABSOLUTE MAXIMUM RATINGS (Ta = 25C unless otherwise noted)
Symbol VDD VI VO IO Pmax Tstg Supply voltage Input voltage Output voltage Driver output current Allowable power dissipation Storage temperature BUS(+) BUS(-) Parameter Conditions Min. -0.3 -0.3 -0.3 -50 -50 200 125 Ratings Typ. Max. 6.5 VDD+0.3 VDD+0.3 50 Unit V V V mA mW C
Note: All voltages shall be based on VSS 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 = 25C unless otherwise noted)
Symbol VDD RBUS Supply voltage BUS resistance Transmission rate = 41.6Kbps Transmission rate = 125Kbps Transmission rate = 41.6Kbps, RBUS = 378 Transmission rate = 125Kbps, RBUS = 378 -20 Parameter Conditions Min. 4.75 105 105 Limits Typ. Max. 5.25 Unit V 10000 pF 3000 75 C
CBUS
BUS capacitance
Topr
Operating temperature
MITSUBISHI
M54617P
LAN TRANSCEIVER
ELECTRICAL CHARACTERISTICS (Ta = 25C and VDD = 5.0V when in normal operation unless otherwise noted)
Symbol IDD1 IDD2 IDD3 VTH1 VTH2 VTL VHYSL VCIN VHYSB IIPP1 IIDP1 IIPP2 IIDP2 IIPM1 IIDM1 IIPM2 IIDM2 VDROP1 VDROP2 VOH1 VOL1 VOH2 IPD CI1 CI2 VTH1 Parameter Supply current 1 Supply current 2 Supply current 3 "H" input threshold voltage 1 "H" input threshold voltage 2 "L" input threshold voltage Hysterisis width BUS input voltage range Input hysterisis width BUS(+) leakage current 1 BUS(+) leakage current 2 BUS(+) leakage current 3 BUS(+) leakage current 4 BUS(-) leakage current 1 BUS(-) leakage current 2 BUS(-) leakage current 3 BUS(-) leakage current 4 Driver and drop voltage "H" output voltage 1 "L" output voltage 1 "H" output voltage 2 ERR pulldown current Input capacitance 1 Input capacitance 2 Grounding offset voltage Conditions RBUS = 105, TX = "L", STB = "H" RBUS = 105, TX = "H", STB = "H" RBUS = 105, 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 OFF (VDD = 0V), BUS(+) = 5V When the power supply is turned ON BUS(+) = 0V When the power supply is turned ON BUS(+) = 5V When the power supply is turned OFF (VDD = 0V), BUS(-) = 5V When the power supply is turned OFF (VDD = 0V), BUS(-) = 0V When the power supply is turned ON BUS(-) = 5V 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 -20 100 100 100 20 100 1.5 0.6 5.0 0.6 5.0 700 150 150 0.5 Min. Limits Typ. Max. 5.0 55 200 2.2 2.3 1.6 0.4 VSS 70 3.2 3.5 2.8 1.0 VDD-2.0 300 100 100 Unit mA mA A V V V V V mV A A A A A A A A V V V V A pF pF V
4.5 4.5 350
MITSUBISHI
M54617P
LAN TRANSCEIVER
TIMING CHARACTERISTICS (Ta = 25C and VDD = 5.0V when in normal operation unless otherwise noted)
Symbol Parameter TX BUS output delay time Conditions CBUS = 10000pF, RBUS = 378 Transmission rate = 41.6Kbps CBUS = 10000pF, RBUS = 378 Transmission rate = 41.6Kbps CBUS = 10000pF, RBUS = 378 Transmission rate = 41.6Kbps Transmission rate = 41.6Kbps Transmission rate = 41.6Kbps Standby mode At error reset At error reset At error reset 3.0 1.0 100 200 Min. Limits Typ. 0.25 Max. Unit s
TdTBr
TdTRr
TX RX rise delay time
0.6
s
TdTRf
TX RX fall delay time BUS RX rise delay time BUS RX fall delay time STB input minimum pulse width STB input setup time STB input holding time ERR input pulse width
3.0
s s s s s ns ns
TdBRr TdBRf TWS TSS ThS TWE
0.35 0.33
MITSUBISHI
M54617P
LAN TRANSCEIVER
TIMING DIAGRAM Timing waveform
TX
BUS (-)
BUS (+) TdTBr TdBRr RX TdTRf TdTRr TdBRf
Error reset timing
ERR (output)
TdE* STB
TwS
TsS ERR (reset input)
ThS
High impedance TwE TdE*= about 20ns (reference value)
MITSUBISHI
M54617P
LAN TRANSCEIVER
APPLICATION EXAMPLE (This is only an example, so it allows more examination if necessary) Transmission route connection example
RL
Transmission route (twist pair cable)
RL
RL BUS(+) BUS(-) M54617P BUS(+) BUS(-) M54617P
RL
Peripheral controller (M64100TFP) and microcomputer circuits
Peripheral controller (M64100TFP) and microcomputer circuits
Board 1
Board n
Peripheral circuit example
0.1F VDD 10F
1 Controller (M64100TFP) 10k
8 RL
M54617P
2 10k 3
7
6 RL
Microcomputer 4 5 VZ = 7V Zenor
BUS(-) BUS (+)
* 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.

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