TH8055 datasheet(4/15 Pages) MICRO-ELECTRONICS

4 / 15 page

TH8055

Single Wire CAN Transceiver

390108055

Page 4 of 15

Rev. 1.1a

Jan 2002

RxD Output pin - Logic data as sensed on the single wire CAN bus

RxD polarity

RxD = logic 1 on this pin indicates a bus

recessive state (low bus voltage)

RxD = logic 0 on this pin indicates a bus

normal or high voltage bus dominant state

RxD in Sleep Mode

RxD do not pass

signals to the micro processor

while in sleep mode until a valid wake up bus

voltage level is received or the Mode 0,1 pins are

not 0,0 respectively. When the valid wake up bus

voltage signal awakens the transceiver,

the RxD

pin signalised an interrupt (logic 0). However, if the

Mode 0 & 1 pins are at logic 0, the transceiver

returns to the sleep condition when the wake up bus

voltage signal is not present.

When not in sleep mode all valid bus signals will be

sent out on the RxD pin.

RxD will be placed in the undriven or off state when

in sleep mode .

RxD Typical Load

Resistance: 2.5 kohms

Capacitance: < 25 pF

Bus LOAD pin - Resistor ground with internal open-on-loss-of-ground protection

When the ECU experiences a loss of ground

condition, this pin switch to a high impedance state.

The ground connection through this pin

is not

interrupted

any

transceiver

operating

mode

including the sleep mode.

The ground connection

only is

interrupted when there is a valid loss of

ground condition.

This pin provides the bus load resistor with a path to

ground which contributes less than 0.1 volts to the

bus offset voltage when sinking the maximum

current through one unit load resistor.

The transceiver’s maximum bus leakage current

contribution to VOL from the LOAD pin when in a

loss of ground state is 50uA over all operating

temperatures and 3.5 < VBAT < 18 volts .

VBAT INPUT pin - Vehicle Battery Voltage

The transceiver is fully operational as described in

Table Static Characteristics over the range 5 < VBAT

< 18 volts as measured between the GND pin and

the VBAT pin.

For 0 < VBAT < 5 volts, the bus is passive (not be

driven dominant) and RxD is undriven (high),

regardless of the state of the TxD pin (undervoltage

lockout).

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