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ATA6603 Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATA6603 Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 362 page  7 4921C–AUTO–01/07 ATA6602/ATA6603 3.3.7 TXD Dominant Time-out Function The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from being driven permanently in the dominant state. If TXD is forced to low longer than t DOM >6ms, the LIN bus driver is switched to the recessive state. To reset this mode switch (> 10 µs) before switching LIN to dominant again. 3.3.8 Output Pin (RXD) This pin reports the state of the LIN bus to the microcontroller. LIN high (recessive state) is reported by a high level at RXD, LIN low (dominant state) is reported by a low level at RXD. The output has an internal pull-up structure with typically 5 k Ω to V DD. The AC characteristics can be defined with an external load capacitor of 20 pF. The output is short-circuit protected. In Unpowered Mode (that is, V S = 0V), RXD is switched off. 3.3.9 Enable Input Pin (EN) This pin controls the operation mode of the interface. If EN is high, the interface is in Normal Mode, with transmission paths from TXD to LIN and from LIN to RXD both being active. The V DD voltage regulator is operating with 5V ±2%/50 mA output capability. If EN is switched to low while TXD is still high, the device is forced to Silent Mode. No data trans- mission is then possible and the current consumption is reduced to I VS =50 µA. The current capability of the V DD regulator is also 50 mA, but the VDD tolerance is between 4.65V and 5.35V. If EN is switched to low while TXD is low, the device is forced to Sleep Mode. No data transmis- sion is possible and the voltage regulator is switched off. 3.3.10 Wake Input Pin (WAKE) This pin is a high voltage input used to wake the device up from Sleep Mode. It is usually con- nected to an external switch in the application to generate a local wake-up. A pull-up current source with typically 10 µA is implemented. If you do not need a local wake-up in your application, connect pin WAKE directly to pin VS. 3.3.11 MODE Input Pin For normal watchdog operation connect pin MODE via an external resistor to GND. For debug- ging your software you can connect pin MODE to 5V and the watchdog is switched off. 3.3.12 TM Input Pin Pin TM is used in final production measurement at Atmel. In the application it is always con- nected to GND. |
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