connectors. If connecting the board to a processor-based system, connect a single cable with all power and
signals via a 10-pin header cable to this port.
2.1.4 TXD Inputs (J11/J22, TP13 and TP14/TP29 and TP31)
For the TCAN1046A footprint, the TXD inputs (pin 1 and 5) of the transceiver; TXD1 is routed to pin 6 of J11, or
TP13. The signal path to the J11 header is pre-installed with a 0-Ω series resistor, R22. TXD2 is routed to pin 10
of J11, or TP14, and the signal path to the J11 header is pre-installed with a 0-Ω resistor, R28.
For the TCAN1046AV foorpint, the TXD inputs (pin 1 and 6) of the transceiver; TXD1 is routed to pin 6 of J22, or
TP29. The signal path to the J22 header is pre-installed with a 0-Ω series resistor, R50. TXD2 is routed to pin 10
of J22, or TP31, and the signal path to the J22 header is pre-installed with a 0-Ω resistor, R54.
2.1.5 RXD Outputs (J11/J22, TP15 and TP16/TP30 and TP34)
For the TCAN1046A footprint, the RXD inputs (pin 4 and 8) of the transceiver; RXD1 is routed to pin 8 of J11, or
TP15. The signal path to the J11 header is pre-installed with a 0-Ω series resistor, R25. RXD2 is routed to pin 12
of J11, or TP16, and the signal path to the J11 header is pre-installed with a 0-Ω resistor, R29.
For the TCAN1046AV footprint, the RXD inputs (pin 4 and 7) of the transceiver; RXD1 is routed to pin 8 of J22,
or TP30. The signal path to the J22 header is pre-installed with a 0-Ω series resistor, R51. RXD2 is routed to pin
12 of J22, or TP34, and the signal path to the J22 header is pre-installed with a 0-Ω resistor, R57.
2.1.6 STBY inputs (J12 and J13/J24 and J25, TP10 and TP12/TP32 and TP33)
For the TCAN1046A footprint, pins 11 and 14 of the device are the STBY inputs. These pins control the state
of the transceiver. STBY1 is routed to J12 or TP10. J12 allows the selection of VCC or GND to connect to the
STBY1 pin, while TP10 is just for observation. STBY2 is routed to J13 or TP12. J13 allows the selection of VCC
or GND to connect to the STBY2 pin, while TP12 is just for observation.
For the TCAN1046AV footprint, pins 8 and 14 of the device are the STBY inputs. These pins control the state
of the transceiver. STBY1 is routed to J24 or TP33. J24 allows the selection of VCC or GND to connect to the
STBY1 pin, while TP33 is just for observation. STBY2 is routed to J25 or TP32. J25 allows the selection of VCC
or GND to connect to the STBY2 pin, while TP32 is just for observation.
2.1.7 Bus Observation (J3 or J8/J14 or J19)
For the TCAN1046A footprint, the CANH and CANL lines are available to be observed on an oscilloscope via the
J3 or J8 headers. The CAN1 bus is routed to the J3 header, with CANH on pin 3, CANL on pin 4, and pins 1, 2,
5, and 6 are connected to GND. The CAN2 bus is routed to the J8 header, with CANH on pin 3, CANL on pin 4,
and pins 1, 2, 5, and 6 are connected to GND.
For the TCAN1046AV footprint, the CANH and CANL lines are available to be observed on an oscilloscope via
the J14 or J19 headers. The CAN1 bus is routed to the J14 header, with CANH on pin 3, CANL on pin 4, and
pins 1, 2, 5, and 6 are connected to GND. The CAN2 bus is routed to the J19 header, with CANH on pin 3,
CANL on pin 4, and pins 1, 2, 5, and 6 are connected to GND.
2.1.8 Bus protection
Footprints for the ESD2CAN24-Q1 ESD protection diodes are available on all CAN buses. D1, D3, D4, and D6
are are all included in the SOT-23 package, which is a common package for ESD protection diodes for CAN
interfaces.
2.2 Using CAN Bus Load, Termination, and Protection Configurations
The TCAN1046AEVM has several bus termination options for all available buses. For the TCAN1046A half of
the board (top half), the termination on the CAN bus (CANH and CANL) can be configured with the J4 and J5
(CAN1) or J7 and J9 (CAN2) jumpers. For the TCAN1046AV half of the board (bottom half), the termination
on the CAN bus (CANH and CANL) can be configured with the J15 and J16 (CAN1) or J18 and J20 (CAN2)
jumpers. Each jumper adds 120-Ω termination to the respective bus. When using one resistor, the EVM is used
as a terminated end of a bus. For electrical measurements to represent the total loading of the bus, use both
120-Ω resistors in parallel to give the standard 60-Ω load for parametric measurement. The footprint for split
termination is also available and can be populated on all 4 buses. These components are not populated out
of the box. Table 2-3 summarizes how to use these termination options. If using split termination, match the
resistors. Calculate the common mode filter frequency using: fC = 1 / (2πRC). Normally, the split capacitance is
EVM Setup and Operation www.ti.com
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