TH8055

Single Wire CAN Transceiver

390108055

Page 5 of 15

Rev. 1.1a

Jan 2002

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, 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

If the CANH voltage decreases under the specified

value below the ECU - ground, 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 500µA.