Datasheet

Failure 3—CANH Short-Circuited to Battery
Failure 4—CANL Short-Circuited to GND
Failure 5—CANH Short-Circuited to Ground or Below Ground (Normal Mode Only)
Failure 6—CANL Short-Circuited to Battery (Normal Mode Only)
Failure 7—CANL Mutually Short-Circuited to CANH
Table 1. Failure States (continued)
MODE DESCRIPTION
Detection Sensing a permanent dominant condition on CANH for a timeout period.
Receiver Receiver switches to single ended on CANL.
Driver CANH and RTH are both switched off (high impedance) and transmission continues on CANL after timeout.
Recovery
When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
MODE DESCRIPTION
Detection Sensing a permanent dominant condition for a timeout period.
Receiver Receiver switches to single ended on CANH.
Driver CANL and RTL are both switched off (high impedance) and transmission continues on CANH after timeout.
Recovery
When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
MODE DESCRIPTION
Detection Detection is provided, sensing the pulse-count difference between CANH and CANL (pulse count = 4).
Receiver Receiver remains in differential mode. No received data lost.
Driver RTH remains on and CANH remains enabled.
Recovery
Recovery is provided, sensing the edge-count difference between CANH and CANL after the detection of four
consecutive pulses.
MODE DESCRIPTION
Detection Detected by a comparator for CANL > 7.3V after a timeout period.
Receiver Receiver switches to single ended on CANH after timeout.
Driver RTL is switched off after timeout. CANH remains active.
Recovery Sensing CANL < 7.3V after the timeout period.
MODE DESCRIPTION
Detection
Sensing a permanent dominant condition on the differential comparator (CANH - CANL > -3.2V) for the timeout
period.
Receiver Receiver switches to CANH single-ended mode after timeout.
Driver CANL and RTL are both switched off after timeout. Transmission remains ongoing on CANH.
Recovery
When the short is removed, the recessive bus voltage is restored (RTL on if CANH - CANL < -3.2V) but CANL still
remains disabled and ERR = 0. If the differential voltage remains below the recessive threshold level (CANH - CANL
< -3.2V) for the timeout period, reception and transmission switch back to the differential mode.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
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