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AS8515 Arkusz danych(PDF) 19 Page - ams AG |
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AS8515 Arkusz danych(HTML) 19 Page - ams AG |
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19 / 65 page  www.ams.com Revision 0.7 19 - 65 AS8515 Datasheet - AS8515 To p Die Overview 7.14 Rx and Tx Interface 7.14.1 Input Tx The 3.3V input Tx controls directly the BUS level. LIN Transmitter acts like a slew-controlled level shifter. A dominant state (low) on Tx leads to the LIN bus being pulled low (dominant state) too. The Tx pin has an internal active pull up connected to VCC. This guarantees that an open Tx pin generates a recessive BUS level. Figure 10. Tx Interface 7.14.2 Output Rx The received BUS signal will be output to the Rx pin: BUS < Vthr_cnt – 0.5 * Vthr_hys → Rx = low BUS > Vthr_cnt + 0.5 * Vthr_hys → Rx = high This output is a push-pull driver between VCC and GND with an output current of 1mA Figure 11. Rx Interface VCC Tx AS8515 MCU VCC IPU_TxD RC-Filter (10ns) Rx VCC AS8515 MCU |
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