TMC2084-HD SMSC, TMC2084-HD Datasheet - Page 18

• Manufacturer Part Number: TMC2084-HD
• Description: Network Controller & Processor ICs DUAL MODE CircLink Cntlr
• Manufacturer: SMSC

Specifications of TMC2084-HD

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 5 Mbps
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Supply Current (max): 25 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 0.2 (10-23-08)
Setting Value
Example 2: Configuring Port D as OUTPUT PORT - The case where the configuration by the shared
pins is different from the initial data from the OUTPUT PORT configured.
The figure below shows the case where the initial data from the OUTPUT PORT does conflict with the
configuration by shared pins when port D is configured as an OUTPUT PORT. Port D remains in high -
impedance state while the reset signal (nRESET) remains low. Also, the OUTPUT PORT remains in high-
impedance state during the period from the falling edge of reset to the beginning of the first output data
received.
During reset, the external tri-state buffer is enabled and the values configured by the shared pins are
inputted to port D. After the reset signal is deasserted, the tri-state buffer is disabled and the initial data
from the OUTPUT PORT is defined by an external pull-up (High) or pull-down (Low) resister. If initial data
from the OUTPUT PORT is needed during the reset, use an external gate as shown in the figure below to
define the data from OUTPUT PORT while the nRESET remains at low level.
A hold time greater than 5 ns is required to retrieve the data configured by the shared pins and place it in
the onchip memory. Thus, a buffer is added to provide a delay time for the control signal of an external tri-
state buffer.
Reset
generator
Only port D remains in Hi-Z
Register
Reset
while nRESET = L
Clock
DATASHEET
Inside of LSI
Page 18
nRESET
PD7-0
Configuration by
shared pins
H
L
Standalone Mode CircLink
Reset signal
Output port
SMSC TMC2084
TM
Datasheet
Controller