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TLE7259G Datasheet(PDF) 6 Page - Infineon Technologies AG |
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TLE7259G Datasheet(HTML) 6 Page - Infineon Technologies AG |
6 / 27 page Data Sheet 6 Rev 2.1, 2007-04-27 TLE7259G Functional Description 4.2 Normal Operation Mode The TLE7259G enters the normal mode after the micro controller sets EN = high (see Figure 3). In Normal operation mode the LIN bus receiver and the LIN bus transmitter are active. Data from the micro controller is transmitted to the LIN bus via the TxD pin, the receiver detects the data stream on the LIN bus and outputs it to the RxD pin. 4.3 Stand-By Mode The Stand-By mode is entered automatically after: • A power-up event on the supply V S. • A wake-up event on the LIN bus. • A local wake-up event on the pin WK. • A power on reset caused by power supply V S dropping below VS,UV,PON (VS < VS,UV,PON). In Stand-By mode no communication on the LIN Bus is possible. The output stage is disabled and the LIN Bus termination remains activated. The RxD and TxD pins are indicating the wake-up source. The RxD pin remains “Low“ after a local and bus wake-up event. A power-up event is indicated by a logical “High“ on RxD pin. The signal on the TxD pin indicates the wake-up source, a weak pull-down signals a bus wake-up event and a strong pull- down signals a local wake-up event caused by the WK pin (see Table 2). In order to detect a wake-up event via the TxD pin, the external micro controller needs outputs needs to provide a logical “high” signal. The wake-up flags indicating the wake-up source on the pins TxD and RxD are reset by changing the operation mode to Normal operation. The signal on the EN pin remains “Low“ due to an internal pull-down resistor. Setting the EN pin to “High“, by the micro controller the device returns to Normal operation mode. Entering the Stand-By mode switches the INH output to V S. Depending on the operation mode of the TLE7259G external circuitry, like a voltage regulator, can be controlled by the INH output. Table 2 Operating modes Mode EN INH TxD RxD LIN Bus Termination Comments Sleep Low Floating Low High1) 1) Pull-up resistor to micro controller power supply ( V IO) required (see Figure 11 and Figure 12). High Impedance No wake-up request detected Stand-By Low High Low2) High3) Low High 1) 30 k Ω (typical) RxD “Low” after local or bus wake-up RxD “High“ after power-up TxD strong pull down after local wake-up (WK pin)2) TxD weak pull down after bus wake-up or power- up3) 2) TxD indicates logical “Low“ in case the micro controller output is set to “High“ and the micro controller output current is limited to less than 1.9 mA. 3) TxD indicates logical “High“ in case the micro controller output is set to “High“. Normal High High Low High Low High 30 k Ω (typical) RxD reflects the signal on the LIN bus TxD driven by the micro controller |
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