TJF1441 datasheet(6/25 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

6 / 25

7.1.1 Off mode

The TJF1441 switches to Off mode from any mode when the supply voltage on pin VIO

falls below the switch-off undervoltage detection threshold (Vuvd(swoff)(VIO)) or when VCC

drops below Vuvd(VCC). This is the default mode when the supply is first connected.

The CAN pins and pin RXD are in a high-ohmic state in Off mode.

When the supply voltage rises above the switch-off undervoltage detection threshold,

the TJF1441 starts to boot up, triggering an initialization procedure. It switches to the

selected mode after tstartup, provided VCC > Vuvd(VCC).

7.1.2 Silent mode

A HIGH level on pin S selects Silent mode. The transmitter is disabled in Silent mode,

releasing the bus pins to VCC/2. All other IC functions, including the receiver, continue to

operate as in Normal mode. Silent mode can be used to prevent a faulty CAN controller

disrupting network communications.

7.1.3 Normal mode

A LOW level on pin S selects Normal mode. In Normal mode, the transceiver can

transmit and receive data via bus lines CANH and CANL. Pin TXD must be HIGH at

least once in Normal mode before transmission can begin. The differential receiver

converts the analog data on the bus lines into digital data on pin RXD. The slopes of the

output signals on the bus lines are controlled internally and are optimized in a way that

guarantees the lowest possible EME. In recessive state, the output voltage on the bus

pins is VCC/2.

TJF1441 Datasheet(PDF) 6 Page - NXP Semiconductors