AS8222 datasheet(32/43 Pages) AMSCO

32 / 43 page

AS8222

Datasheet - B u s D r i v e r

www.ams.com/eng/FlexRay/AS8222

Revision 1.0

31 - 42

8.3 Transmitter

In NORMAL mode, while BGE is high, the transmitter drives full voltage levels on the bus after tTXEN_BUS_Idle_Active from TxEN falling edge and

drives idle after tTXEN_BUS_Active_Idle from TxEN rising edge.

The Transmitter is not permanently enabled. If after the time tTxEN_timeout no edge is detected at TxEN, the transmission will be stopped to avoid

unwanted collisions on the FlexRay bus.

Figure 8. Transmitter Characteristics (TxEN

→ BUS, while BGE is high)

In NORMAL mode, while TxEN is high, the transmitter drives full voltage levels on the bus after tTXEN_BUS_Idle_Active from BGE rising edge and

drives idle after tTXEN_BUS_Active_Idle from BGE falling edge.

VTxEN

VBUS

-VBUS_DIFF_Idle

+ VBUS_DIFF_Idle

VBUS_DIFF_D1

VBUS_DIFF_D0

tTxEN_BUS_Active_Idle

tBUS_Idle_Active

tBUS_Active_Idle

300 mV

- 300 mV

30% * VIO

70% * VIO

tTxEN_BUS_Idle_Active

< tTxEN_timeout

AS8222 Datasheet(PDF) 32 Page - ams AG