TH8055 Datasheet, PDF (4/15 Pages) Micro Electronics – Single Wire CAN Transceiver

TH8055
Single Wire CAN Transceiver
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 in 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 .
V_BAT INPUT pin - Vehicle Battery Voltage
The transceiver is fully operational as described in
Table Static Characteristics over the range 5 < V_BAT
< 18 volts as measured between the GND pin and
the V_BAT pin.
For 0 < V_BAT < 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).
390108055
Rev. 1.1a
Page 4 of 15
Jan 2002