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TJA1028TK3V320 Datasheet(PDF) 5 Page - NXP Semiconductors |
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TJA1028TK3V320 Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 24 page TJA1028 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 25 February 2011 5 of 24 NXP Semiconductors TJA1028 LIN transceiver with integrated voltage regulator The TJA1028T/xxx/20 and TJA1028TK/xxx/20 versions are optimized for a speed of 20 kBd, the maximum specified in the LIN standard. The TJA1028T/xxx/10 and TJA1028TK/xxx/10 versions are optimized for a transmission speed of 10.4 kBd, as specified in SAE J2602. 7.1 Operating modes The TJA1028 supports four operating modes: Normal, Standby, Sleep and Off. The operating modes, and the transitions between modes, are illustrated in Figure 3. 7.1.1 Off mode The TJA1028 switches to Off mode from all other modes if the battery supply voltage drops below the power-off detection threshold (Vth(det)poff) or the junction temperature exceeds the overtemperature protection activation threshold (Tth(act)otp). The voltage regulator and the LIN physical layer are disabled in Off mode, and pin RSTN is forced LOW. 7.1.2 Standby mode Standby mode is a low-power mode that guarantees very low current consumption. (1) In Normal mode, the LIN transmitter is enabled - but if EN and/or RSTN go LOW, the LIN transmitter will be disabled. Remote wake-up signalling will be activated. (2) Until VCC drops below 2 V. (3) If a wake-up event and a go-to-sleep event occur simultaneously, the device will switch directly to Standby mode without initiating a reset. Fig 3. State diagram NORMAL(1) LIN = on STANDBY LIN = off (RXD signals wake source) AII states OFF LIN = off RXD = floating RSTN = LOW VBAT > Vth(det)pon AND Tvj < Tth(rel)otp Voltage regulator - on Voltage regulator - off wake-up(3) event 015aaa086 EN = 1 AND RSTN = 1 EN = 1 0 AND(3) TXD = 0 AND RSTN = 1 EN = 1 EN = 1 0 AND TXD = 1 AND RSTN = 1 VBAT < Vth(det)poff OR Tvj > Tth(act)otp SLEEP LIN = off RXD = VCC(2) RSTN = LOW remote wake-up |
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