TH8055

Single Wire CAN Transceiver

2.5

2.6

VBAT INPUT pin

Vehicle Battery Voltage

of the state of the TxD pin (undervoltage lockout).

modes are possible until thermal shutdown (because of increased power dissipation), the transceiver does

not disturb normal communication.

CAN BUS input/output pin

Wave Shaping in normal and wake up mode

Wave shaping is incorporated into the transmitter to minimize EMI radiated emissions.

An important

contributor to emissions is the rise and fall times during output transitions at the “corners” of the voltage

waveform. The resultant waveform is one half of a sin wave of frequency 50 - 65 kHz at the rising waveform

edge and one quarter of this sin wave at falling or trailing edge.

Wave Shaping in high speed mode

Wave shaping control of the rising and falling waveform edges are disabled during high speed mode. EMI

emissions requirements are waived during this mode. The waveform rise time in this mode is less than one

µs.

Short circuits

If the CAN BUS pin is shorted to ground for any duration of time, the current is limited as specified in table

“static characteristics” and an over temperature shut down circuit disables the output high side drive source

transistor before the local die temperature exceeds the damage limit threshold.

Loss of ground

In case of a valid loss of ground condition, the LOAD pin is switched into high impedance state. The CANH

transmission is continued until the undervoltage lock out voltage threshold is detected.

Loss of battery

In case of loss of battery (VBAT = 0 or open) the transceiver do not disturb bus communication. The

maximum reverse current into power supply system doesn‘t exceed 1mA.

TH8055 - Datasheet

Page 6 of 20

3901008055

May 2004

Rev 005