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TH8082 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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TH8082 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
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3 / 14 page  TH8082 Single LIN Transceiver www.melexis.com Page 3 Data Sheet Rev 1.0 June 2001 Functional Description After power on the chip automatically enters the VBAT- stanby mode . In this intermediate mode the INH output will become HIGH (VS) and therefore the voltage regula- tor will provide the VCC - supply . The transceiver will remain the VBAT-stanby mode until the controller sets it to normal operation ( EN = High ) . Only in this mode bus communication is possible. The TH8082 switches itself in the VBAT-stanby mode if VCC is missing or below the threshold. The sleep mode ( EN = LOW) can only be reached from normal mode and permits a very low power consumtion because the transceiver and even the external voltage regulator get disabled. If the VCC has been switched off a wake-up request from the bus line will cause the TH8082 to enter the VBAT-stanby mode (VCC is present again) and sets the RxD output to low until the device enters the normal operation mode (active LOW interrupt at RxD). If the INH pin is not connected to the regulator or the inhibi- table external regulator is not the one that provides the VCC – supply, the normal mode is directly accessilble by a logic high on the EN pin. In order to prevent an unintended wake-up caused by disturbances of the automotiv environment incoming dominant signals from the bus have to exceed the wake– up delay time. EN VCC Comment INH RxD 0 0 VBAT-standby , power on Vs 0 0 1 VBAT-standby , VCC on , wake up condition after power on Vs Active LOW wake-up interrupt 1 1 Normal mode , VCC on Vs 1 = recessive bus 0 = dominant bus 1 0 VBAT-standby , VCC missing (VCC<VCCUV) Vs VCC 0 0 Sleep mode, switch to VBAT-standby in case of wake-up request floating Active LOW wake-up inter- rupt if VCC is present 0 1 Sleep mode, regulator not disabled, switch to VBAT-standby in case wake-up request, directly switch to normal mode with EN = 1 floating Active LOW wake-up interrupt Mode Control of TH8082 |
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