MAX13050ASA Datasheet, PDF (11/20 Pages) Maxim Integrated Products – Industry-Standard High-Speed CAN Transceivers with +80,-80V Fault Protection

MAX13050/MAX13052/MAX13053/MAX13054
Industry-Standard High-Speed CAN
Transceivers with ±80V Fault Protection
Table 2. Transmitter and Receiver Truth Table (MAX13052)
TXD
Low
High or Open
X
RS
V_RS ≤ 0.75 x V_CC
V_RS ≤ 0.75 x V_CC
V_RS ≥ 0.75 x V_CC
CANH
High
V_CC / 2
R_ICM to GND
CANL
Low
V_CC / 2
R_ICM to GND
BUS STATE
Dominant
Recessive
Recessive
RXD
Low
High
High
Table 3. Transmitter and Receiver Truth Table
(MAX13053)
TXD
Low
High or Open
X
RS
V_S < 0.8V
V_S < 0.8V
V_S > 2V
CANH
High
V_CC / 2
V_CC / 2
CANL
Low
V_CC / 2
V_CC / 2
BUS STATE
Dominant
Recessive
Recessive
RXD
Low
High
High
(MAX13050/MAX13054)
TXD
STBY
Low
V_STBY ≤ 0.8V
*V_STBY ≤ 0.3 x V_CC2
High or Open
V_STBY ≤ 0.8V
*V_STBY ≤ 0.3 x V_CC2
X
V_STBY ≥ 2V
*V_STBY ≥ 0.7 x V_CC2
*For the MAX13054
CANH
High
V_CC / 2
R_ICM to GND
t_DOM
TRANSMITTER
ENABLED
TXD
V_CANH - V_CANL
TRANSMITTER
DISABLED
Figure 3. Transmitter Dominant Timeout Timing Diagram
CANL
Low
V_CC / 2
R_ICM to GND
BUS STATE
Dominant
Recessive
Recessive
RXD
Low
High
High
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, V_CC2, 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 V_CC2 to V_CC to operate the MAX13054 with
+5V logic systems.
(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 V_DIFF =
(CANH - CANL) with respect to an internal threshold of
0.7V. If this difference is positive (i.e., V_DIFF > 0.7), a
logic-low is present at RXD. If negative (i.e., V_DIFF <
0.7V), a logic-high is present.
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,
Maxim Integrated
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