NXP Semiconductors

TJR1441

High-speed CAN transceiver

TJR1441

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Product data sheet

Rev. 1 — 7 September 2020

7 / 31

7 Functional description

7.1 Operating modes

The TJR1441 supports three operating modes, Normal, Silent and Off. The operating

mode is selected via pin S in the TJR1441A/B and via pins S_N and OFF in the

TJR1441D. See Table 4 and Table 5 for a description of the operating modes under

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

Table 4. Operating modes: TJR1441A/B

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

X

HIGH when bus recessive

Off[1]

X

X

high-ohmic state

high-ohmic state

[1]

Off mode is only entered when the voltage on supply pin VCC or VIO (TJR1441A) is below any undervoltage detection

threshold (see Figure 4 and Figure 5).

Table 5. Operating modes: TJR1441D

Inputs

Outputs

Mode

Pin S_N Pin OFF Pin TXD

CAN driver

Pin RXD

LOW

dominant

LOW

LOW when bus dominant

Normal

HIGH

LOW

HIGH

recessive

HIGH when bus recessive

LOW when bus dominant

Silent

LOW

LOW

X

HIGH when bus recessive

Off[1]

X

HIGH

X

high-ohmic state

high-ohmic state

[1]

Off mode is also entered when the voltage on supply pin VCC is below the undervoltage detection threshold (see

Figure 6).