EVM Setup and Operation
6
SLLU296 – August 2018
Copyright © 2018, Texas Instruments Incorporated
TCAN1046V Evaluation Module
2.1.6
STBY inputs (J9/J4, TP2/TP14)
Pins 8 and 14 of the device are the STBY inputs. These pins are one way of controlling the state of the
receiver. STBY1 is routed to J4 or TP2. J4 allows the selection of VCC or GND to connect to the STBY1
pin, while TP2 is just for observation. STBY2 is routed to J9 or TP14. J9 allows the selection of VCC or
GND to connect to the STBY2 pin, while TP14 is just for observation.
2.1.7
Bus Observation (J1 or J7)
The CANH and CANL lines are available to be observed on an oscilloscope via the J1 or J7 headers. The
CAN1 bus is routed to the J1 header, with CANH on pin 3, CANL on pin 4, and pins 1, 2, 5, and 6
connected to GND. The CAN2 bus is routed to the J7 header, with CANH on pin 3, CANL on pin 4, and
pins 1, 2, 5, and 6 connected to GND.
2.1.8
Bus protection
Footprints for ESD protection diodes are available on both CAN buses. D1 and D2 are both in the SOT-23
package, which is a common package for ESD protection diodes for CAN interfaces.
2.1.9
TP3 Configuration
This connects directly to device pin 8. Ensure JMP1 configuration is not conflicting if TP3 is used as the
input connection.
2.1.10
Pin 5 (JMP6, JMP2 or TP8)
Pin 5 of the transceiver have various uses depending on the transceiver. Examples are V
REF
, SPLIT, V
RXD
,
V
IO
, LBK, EN, AB and No Connect (NC). Pin 5 of the device is routed to JMP6, JMP2 and TP8.
2.1.11
Pin 5 – JMP6 Configurations (4-Way Jumper)
If using separate I/O inputs, JMP6 is used to configure pin 5 to: pullup to V
CC
, pulldown to GND, V
RXD
or
V
IO
supply input, or V
REF
or SPLIT termination output.
•
V
REF
or SPLIT termination:
If the device and application support split termination, set JMP6 to V
CM
(V
common mode) to drive the V
REF
or SPLIT pin common mode stabilizing voltage output to the center
tap of the split termination capacitor. Install these components on the EVM as outlined in the CAN bus
termination section.
•
No Connection:
If the device and application require no use of pin 5, leave it open. If the device has
the V
REF
or SPLIT pin but the application is not using the pin for split termination then add a capacitor
on C6 to improve EMC performance.
•
2nd Mode or Control Input:
if the device and application use pin 5 as a second mode or control pin,
then set JMP6 as either a pullup to V
CC
or pulldown to GND, as necessary.
•
I/O and RXD level-shifting supply:
if the device and application used with V
IO
or V
RXD
to level shift I/O
pins on the transceiver then set JMP6 to V
RXD
connecting pin 5 of the device to the V
RXD
pin on JMP2.
Install local buffering and bypass capacitor C6.
2.1.12
JMP2 Configuration
Using header JMP2 assumes all the digital I/O signals, V
CC
, and GND are routed to an external system.
Ensure that pin 5 (JMP6) jumper settings are not conflicting with signals to JMP2. For power supply V
RXD
,
set the jumper to route JMP2 supply input to the transceiver pin.
2.1.13
TP8 Configuration
This connects directly to device pin 5. Ensure JMP6 configuration is not conflicting if TP8 is used as an
input connection.
