TMC2084-HD SMSC, TMC2084-HD Datasheet - Page 67

• 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

Standalone Mode CircLink
Datasheet
4.1.5
SMSC TMC2084
Case Where Port A and B are Unused
Although both port A (PA7 - 0) and port B (PB7 - 0) are output-only ports, input buffers exist to send
(feedback) the states of the OUTPUT PORT to the host node. The OUTPUT PORT remains in its high-
impedance (floating) state during both reset (nRESET = Low) and the period from de-assertion of reset
(nRESET = High) to the first OUTPUT DATA packet received. Thus, the input node of the input buffer may
be placed in the open state (undefined) during the high-impedance state. This can cause a punch-through
current through the input buffer. To avoid this, either a pull-up or a pull-down resister should be added
externally to each pin of both ports A and B so that each added resister can define the input sate of the
corresponding input buffer during the high-impedance state.
Either a pull-up or a pull-down resister is required externally connected to each pin of both unused ports A
and B as described above.
TM
PA7, PB7
PA6, PB6
PA5, PB5
PA4, PB4
PA3, PB3
PA2, PB2
PA1, PB1
PA0, PB0
Controller
N o pul l - up/dow n r es i st er causes
t he i nput i t s open st at e dur i ng
H i - Z st at e.
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O ut put Buf f er
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DATASHEET
I nput buf f er
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Page 67
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←
←
PAD7-0
PB7-0
A pull-up or pull-
down resister is
needed for each pin.
A pull-up or pull-
down resister is
needed for each pin.
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Revision 0.2 (10-23-08)