TJF1441 datasheet(5/25 Pages) NXP

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NXP Semiconductors

TJF1441

High-speed CAN transceiver

TJF1441

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Product data sheet

Rev. 1 — 12 August 2020

5 / 25

7 Functional description

7.1 Operating modes

The TJF1441 supports three operating modes, Normal, Silent, and Off. The operating

mode is selected via pin S. See Table 4 for a description of the operating modes under

normal supply conditions. Mode changes are completed after transition time tt(moch).

Table 4. Operating modes

Inputs

Outputs

Mode

Pin S

Pin TXD

CAN driver

Pin RXD

LOW

dominant

LOW

LOW when bus dominant

Normal

LOW

HIGH

recessive

HIGH when bus recessive

LOW when bus dominant

Silent

HIGH

biased to VCC/2

HIGH when bus recessive

Off[1]

high-ohmic state

[1]

Off mode is only entered when the voltage on pin VCC is below Vuvd(VCC) or the voltage on pin VIO is below Vuvd(swoff)VIO

(see Figure 3 ).

aaa-031270

OFF

(CAN BIAS

= high-

ohmic)

NORMAL

(CAN BIAS

= VCC/2)

SILENT

(CAN BIAS

= VCC/2)

S = HIGH AND

NOT(VCC < Vuvd(VCC) for t > tdet(uv))

VCC < Vuvd(VCC) for t > tdet(uv)

from any mode when

VIO < Vuvd(swoff)(VIO) for t > tuvd(swoff)

VCC < Vuvd(VCC) for t > tdet(uv)

S = LOW AND

NOT(VCC < Vuvd(VCC) for t > tdet(uv))

S = LOW

AND VCC > Vuvd(VCC) for t > trec(uv)

AND VIO > Vuvd(swoff)(VIO) for t > tstartup

S = HIGH

AND VCC > Vuvd(VCC) for t > trec(uv)

AND VIO > Vuvd(swoff)(VIO) for t > tstartup

Figure 3. TJF1441 state diagram

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