AS8221-ASSP datasheet(26/41 Pages) AMSCO

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AS8221

Datasheet - Application In form atio n

www.austriamicrosystems.com/flexray/AS8221

Revision 1.4

26 - 41

9.9 Transmitter

The transmitter generates out of a digital input signal on TxD the FlexRay differential bus voltage. The transmitter is only active in NORMAL

mode if BGE is on logical high and TxEN is on logical low.

Figure 12. Transmitter Characteristics (TxD

→ BUS)

Figure 13. Transmitter Characteristics (TxEN

→ BUS)

VTxD

VBUS

-VBUS_DIFF_Idle

+ VBUS_DIFF_Idle

VBUS_DIFF_D1

VBUS_DIFF_D0

tTxD_BUS01

tTxD_BUS10

tBUS01

Data1: x * tBIT

Data0: x * tBIT

Data1: x * tBIT

Data0: x * tBIT

80% * VBUS_DIFF

20% * VBUS_DIFF

30% * VIO

70% * VIO

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

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