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MAX13052ASA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX13052ASA Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 20 page  MAX13050/MAX13052/MAX13053/MAX13054 Industry-Standard High-Speed CAN Transceivers with ±80V Fault Protection 11 Maxim Integrated (Figure 3). The transmitter becomes enabled upon detecting a rising edge at TXD. Receiver The receiver reads differential inputs from the bus lines (CANH, CANL) and transfers this data as a single- ended output (RXD) to the CAN controller. It consists of a comparator that senses the difference VDIFF = (CANH - CANL) with respect to an internal threshold of 0.7V. If this difference is positive (i.e., VDIFF > 0.7), a logic-low is present at RXD. If negative (i.e., VDIFF < 0.7V), a logic-high is present. The CANH and CANL common-mode range is greater than ±12V. RXD is logic-high when CANH and CANL are shorted or terminated and undriven. +3.3V Logic Compatibility (MAX13054) A separate input, VCC2, allows the MAX13054 to com- municate with +3.3V logic systems while operating from a +5V supply. This provides a reduced input voltage threshold to the TXD and STBY inputs, and provides a logic-high output at RXD compatible with the microcon- troller’s system voltage. The logic compatibility elimi- nates longer propagation delay due to level shifting. Connect VCC2 to VCC to operate the MAX13054 with +5V logic systems. Driver Output Protection The current-limiting feature protects the transmitter out- put stage against a short circuit to a positive and nega- tive battery voltage. Although the power dissipation increases during this fault condition, current-limit pro- tection prevents destruction of the transmitter output stage. Upon removal of a short, the CAN transceiver resumes normal operation. Thermal Shutdown If the junction temperature exceeds +165°C, the driver is switched off. The hysteresis is approximately 13°C, TXD RS CANH CANL BUS STATE RXD Low VRS ≤ 0.75 x VCC High Low Dominant Low High or Open VRS ≤ 0.75 x VCC VCC / 2 VCC / 2 Recessive High XVRS ≥ 0.75 x VCC RICM to GND RICM to GND Recessive High TXD RS CANH CANL BUS STATE RXD Low VS < 0.8V High Low Dominant Low High or Open VS < 0.8V VCC / 2 VCC / 2 Recessive High XVS > 2V VCC / 2 VCC / 2 Recessive High Table 2. Transmitter and Receiver Truth Table (MAX13052) TXD STBY CANH CANL BUS STATE RXD Low VSTBY ≤ 0.8V *VSTBY ≤ 0.3 x VCC2 High Low Dominant Low High or Open VSTBY ≤ 0.8V *VSTBY ≤ 0.3 x VCC2 VCC / 2 VCC / 2 Recessive High X VSTBY ≥ 2V *VSTBY ≥ 0.7 x VCC2 RICM to GND RICM to GND Recessive High Table 3. Transmitter and Receiver Truth Table (MAX13053) (MAX13050/MAX13054) TRANSMITTER DISABLED TRANSMITTER ENABLED tDOM TXD VCANH - VCANL Figure 3. Transmitter Dominant Timeout Timing Diagram * For the MAX13054 |
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