Texas Instruments SN65HVD255D Evaluation Module SN65HVD255DEVM SN65HVD255DEVM 데이터 시트
제품 코드
SN65HVD255DEVM
2 EVM Setup and Operation
2.1.6
MODE Select/ Pin 8 (JMP1, JMP2 or TP3)
Pin 8 of the transceiver is normally a mode control pin of the device. Pin 8 of the device is routed to JMP1,
JMP2 and TP7.
JMP2 and TP7.
2.1.7
MODE - JMP1 configurations (3 way jumper)
If using separate I/O inputs JMP1 will be used to configure pin 8 to a pull up to V
CC
or pull down to GND
configuration. For most devices when Pin 8 is pulled to GND the device will be in
“
normal
”
or high speed
mode. R3 is pre-installed with 0
Ω
resistor to GND for this purpose. For most devices when Pin 8 is pulled
to V
CC
the device will be in a silent or low power standby mode. Devices with slope control mode use the
resistance to ground value to determine the slope of the driver output. R2 is left open for customers who
want to install a resistance to ground and use slope mode.
want to install a resistance to ground and use slope mode.
2.1.8
JMP2 configuration
Using header JMP2 which assumes all the digital I/O signals, V
CC
, GND are routed to an external system.
Ensure that the MODE (JMP1) jumper settings are not conflicting with signals to JMP2.
2.1.9
TP3 configuration
This connects directly to device pin 8. Ensure JMP1 configuration isn
’
t 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 will be used to configure pin 5 to: pull up to V
CC
, pull down to GND, V
RXD
/ V
IO
supply input or V
REF
/SPLIT termination output.
•
V
REF
/SPLIT termination: If the device
&
application support split termination then JMP6 should be set
to V
CM
(V Common Mode) to drive the V
REF
/SPLIT pin common mode stabilizing voltage output to the
center tap of the split termination capacitor. These components will need to be installed on the EVM as
outlined in the CAN bus termination section.
outlined in the CAN bus termination section.
•
No Connection: If the device
&
application require no use of pin 5 then it may be left open. If the
device has V
REF
or SPLIT pin but the application isn
’
t using the pin for split termination then a capacitor
may be added on C6 to improve EMC performance.
•
2nd Mode / Control Input: if the device
&
application use pin 5 as a second mode or control pin then
JMP6 should be set to as either a pull up to V
CC
or pull down to GND as necessary.
•
I/O
&
RXD level shifting supply: if the device
&
application use with V
IO
or V
RXD
to level shift I/O pins
on the transceiver then JMP6 may be set to V
RXD
which connects pin 5 of the device to V
RXD
pin on
JMP2. Local buffering and bypass capacitor C6 should be installed.
2.1.12
JMP2 configuration
Using header JMP2 assumes all the digital I/O signals, V
CC
, 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
the jumper needs to be set to route JMP2 supply input to the transceiver pin.
2.1.13
TP8 configuration
This connects directly to device pin 5. Ensure JMP6 configuration isn
’
t conflicting if TP8 is used as an
input connection.
6
CAN EVM User Guide
SLLU158
–
December 2011
Copyright
©
2011, Texas Instruments Incorporated