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TLE7250GVIO 데이터시트(PDF) 9 Page - Infineon Technologies AG |
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TLE7250GVIO 데이터시트(HTML) 9 Page - Infineon Technologies AG |
9 / 23 page TLE7250GVIO Functional Description Data Sheet 9 Rev. 1.0, 2012-03-14 4.3 Normal-operating Mode In the normal-operating mode, the HS CAN transceiver TLE7250GVIO sends the serial data stream on the TxD pin to the CAN bus. The data on the CAN bus is displayed at the RxD pin simultaneously. In normal-operating mode, all functions of the TLE7250GVIO are active: • The transmitter is active and drives data from the TxD to the CAN bus. • The receiver is active and provides the data from the CAN bus to the RxD pin. • The bus biasing is set to V CC/2. • The undervoltage monitoring at the power supply V CC and at the power supply VIO is active. To enter the normal-operating mode, set the NEN pin to logical “low” (see Table 2 or Figure 4). The NEN pin has an internal pull-up resistor to the power-supply V IO. 4.4 Stand-by Mode The stand-by mode is an idle mode of the TLE7250GVIO with optimized power consumption. In the stand-by mode, the TLE7250GVIO can not send or receive any data. The transmitter and the receiver unit are disabled. Both CAN bus pins, CANH and CANL are connected to GND via the input resistors. • The transmitter is disabled. • The receiver is disabled. • The input resistors of the receiver are connected to GND. • The undervoltage monitoring at the power supply V CC and at the power supply VIO is active. To enter the stand-by mode, set the pin NEN to logical “high” (see Table 2 or Figure 4). The NEN pin has an internal pull-up resistor to the power-supply V IO. If the stand-by mode is not used in the final application, the NEN pin needs to be connected to GND. 4.5 Power-down State The power-down state means that the TLE7250GVIO is not supplied. In power-down state, the differential input resistors of the receiver are switched off. The CANH and CANL bus interface of the TLE7250GVIO act as high- impedance input with a very small leakage current. The high-ohmic input does not influence the “recessive” level of the CAN network and allows an optimized EME performance of the entire CAN network. |
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