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TJA1051T Datasheet(PDF) 4 Page - NXP Semiconductors |
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TJA1051T Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 18 page TJA1051_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 1 July 2009 4 of 18 NXP Semiconductors TJA1051 High-speed CAN transceiver 6. Functional description The TJA1051 is a high-speed CAN stand-alone transceiver with Silent mode. It combines the functionality of the TJA1050 transceiver with improved EMC and ESD handling capability. Improved slope control and high DC handling capability on the bus pins provides additional application flexibility. The TJA1051 is available in two versions, distinguished only by the function of pin 5: • The TJA1051T is 100 % backwards compatible with the TJA1050 • The TJA1051T/3 and TJA1051TK/3 allow for direct interfacing to microcontrollers with supply voltages down to 3 V 6.1 Operating modes The TJA1051 supports two operating modes, Normal and Silent, which are selectable via pin S. See Table 3 for a description of the operating modes under normal supply conditions. [1] LOW if the CAN bus is dominant, HIGH if the CAN bus is recessive. [2] X = don't care 6.1.1 Normal mode A LOW level on pin S selects Normal mode. In this mode, the transceiver is able to transmit and receive data via the bus lines CANH and CANL (see Figure 1 for the block diagram). The differential receiver converts the analog data on the bus lines into digital data which is output to pin RXD. The slope of the output signals on the bus lines is controlled and optimized in a way that guarantees the lowest possible ElectroMagnetic Emission (EME). 6.1.2 Silent mode A HIGH level on pin S selects Silent mode. In Silent mode the transmitter is disabled, releasing the bus pins to recessive state. 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 from disrupting all network communications. 6.2 Fail-safe features 6.2.1 TXD dominant time-out function A ‘TXD dominant time-out’ timer is started when pin TXD is set LOW. If the LOW state on pin TXD persists for longer than tto(dom)TXD, the transmitter is disabled, releasing the bus lines to recessive state. This function prevents a hardware and/or software application Table 3. Operating modes Mode Inputs Outputs Pin S Pin TXD CAN driver Pin RXD Normal LOW LOW dominant active[1] LOW HIGH recessive active[1] Silent HIGH X[2] recessive active[1] |
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