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Q67006-A9584 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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Q67006-A9584 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 25 page TLE 6254-3 G Data Sheet 9 Rev. 2.0, 2005-03-24 Operation Modes, Wake-Up In addition to the normal operation mode, the TLE 6254-3 G offers a receive-only mode as well as two low power operation modes to save power during periods that do not require communication on the CAN bus: sleep mode, V BAT stand-by mode (see Table 2 and Figure 4). Via the control input pins NSTB and ENT the operation modes are selected by the microcontroller. In the low power modes neither receiving nor transmitting of messages is possible. In sleep operation mode the lowest power consumption is achieved. In order to minimize the overall current consumption of the ECU (electronic control unit) the external voltage regulator (5 V supply) is deactivated by the INH output in this mode, when connected. For that purpose the INH output is switched to high impedance. In parallel the CANL line is pulled-up to the battery supply voltage via the RTL output and the pull-up paths at the input pins TxD and RxD are disabled from the internal supply. To enter the sleep operation mode the transition mode “Go-to-Sleep” has to be selected (Figure 4) for a minimum time t h(min). After the minimum hold time th(min) the sleep mode can be actively selected. Otherwise the TLE 6254-3 G will automatically fall in sleep mode because of the not powered microcontroller. On a wake-up request either by bus line activities or via the WAKE input, the transceiver is automatically set in V BAT stand-by mode. Now the voltage regulator (5 V supply) is enabled by the INH output. The WAKE input reacts to both, transition from high to low voltage level as well as the other way round. To avoid faulty wake-ups due to transients on the bus lines or the WAKE input circuitry respectively, a certain filter time is implemented. As soon as V CC is provided, the wake-up request is monitored on both, the NERR and RxD outputs, by setting them low. Upon this the microcontroller can activate the normal operation mode by setting the control inputs NSTB and ENT high. The V BAT stand-by mode corresponds to the sleep mode, but a voltage regulator connected to the INH output will remain active. Wake-up requests via the WAKE pin or the bus lines are immediately reported to the microcontroller by setting RxD and NERR low. A power-on condition ( V BAT pin is supplied) automatically switches the TLE 6254-3 G to V BAT stand-by mode. In the receive-only mode data on the CAN-bus are transferred to the RxD output, but both output stages, CANH as well as CANL are disabled. This means that data at the TxD input are not transmitted to the CAN bus. This mode is useful in combination to a dedicated network-management software that allows separate diagnosis for all nodes. A wake-up request in the receive-only mode is only reported at the RxD-output. The NERR output in this mode is used to indicate a battery fail condition. When entering the normal mode the V BAT-flag is reset and the NERR output becomes high again. This feature is useful e.g. when changing the ECU and therefore a presetting routine of the microcontroller has to be started. |
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