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TJA102120 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TJA102120 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 25 page TJA1021 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 6 — 30 December 2010 5 of 25 NXP Semiconductors TJA1021 LIN 2.1/SAE J2602 transceiver 7. Functional description The TJA1021 is the interface between the LIN master/slave protocol controller and the physical bus in a Local Interconnect Network (LIN). The TJA1021 is LIN 2.1/SAE J2602 compliant and provides optimum ElectroMagnetic Compatibility (EMC) performance due to wave shaping of the LIN output. The TJA1021T/20 and TJA1021TK/20 are optimized for the maximum specified LIN transmission speed of 20 kBd; theTJA1021T/10 and TJA1021TK/10 are optimized for the LIN transmission speed of 10.4 kBd as specified by the SAE J2602. 7.1 Operating modes The TJA1021 supports modes for normal operation (Normal mode), power-up (Power-on mode) and very-low-power operation (Sleep mode). An intermediate wake-up mode between Sleep and Normal modes is also supported (Standby mode). Figure 3 shows the state diagram. TERM.: slave termination resistor, connected between pins LIN and VBAT. Fig 3. State diagram 001aae073 t(SLP_N = 1) > tgotonorm t(SLP_N = 1) > tgotonorm t(SLP_N = 1) > tgotonorm t(SLP_N = 0) > tgotosleep t(WAKE_N = 0; after 1→0) > tWAKE_N or t(LIN = 0→1; after LIN = 0) > tBUS switching on VBAT Normal INH: high TERM. = 30 k Ω RXD: receive data output TXD: transmit data input Transmitter: on Standby INH: high TERM. = 30 k Ω RXD: low TXD: wake source output Transmitter: off Sleep INH: floating TERM. = high ohmic RXD: floating TXD: weak pull-down Transmitter: off Power-on INH: high TERM. = 30 k Ω RXD: floating TXD: weak pull-down Transmitter: off |
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